9,967 results on '"WIRELESS LANs"'
Search Results
2. A compact quad element human face‐shaped wideband MIMO antenna for 5G applications.
- Author
-
Mistri, Raj Kumar, Mahto, Santosh Kumar, and Sinha, Rashmi
- Subjects
- *
WIRELESS LANs , *SLOT antennas , *REFLECTANCE , *ANTENNAS (Electronics) , *STATISTICAL correlation - Abstract
Summary: This article presents a quad element wideband multiple‐input multiple‐output (MIMO) antenna consisting of human face‐shaped patch radiators with defected ground structure (DGS) having rectangular split ring resonator (RSRR) in ground surface. The measured bandwidth of the proposed MIMO antenna is 3.0–6.5 GHz, and the isolation between the ports is more than 16 dB. Additionally, simulated diversity characteristics like the channel capacity loss (CCL), channel capacity (CC), total active reflection coefficient (TARC), mean effective gain (MEG), and envelope correlation coefficient (ECC) are investigated with the measured value and observed to be within the acceptable ranges over the operating frequency band. The suggested antenna can be used in the wireless local area network (WLAN) (i.e., 4.9–5.725 GHz), wireless fidelity (Wi‐Fi) (i.e., 5.15–5.85 GHz), and 5G under 6 GHz (3.3–5.0 GHz) frequency ranges. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Enhancing IoT security in wireless local area networks through dynamic vulnerability scanning.
- Author
-
SENTHILRAJA, P, NANCY, P, SHERINE GLORY, J, and MANISHA, G
- Subjects
- *
WIRELESS LANs , *PENETRATION testing (Computer security) , *INTERNET of things , *NETWORK performance , *REINFORCEMENT learning , *COMPUTER network security - Abstract
Wireless local area networks (WLANs) play a crucial role in the internet of things (IoT) landscape, facilitating constant data exchange among devices. However, the inherent security vulnerabilities in these networks, stemming from limited computational resources, pose significant challenges to deploying robust security measures. This research addresses the security concerns surrounding IoT devices within the IEEE 802.11ah WLAN environment by introducing the SecureScanML algorithm, a novel machine learning (ML) approach designed to optimize Internet-wide port scans (IWPS) for enhanced device security while preserving network performance. The SecureScanML algorithm leverages Q-learning, a reinforcement learning technique, to dynamically adjust the scan rates of IoT devices adaptively. Through this approach, the algorithm effectively reduces vulnerabilities, achieving a notable 35.7% reduction, while maintaining key network performance metrics. With a throughput of 2.8 Mbps, a packet delivery ratio of 97.3%, an adaptability index of 0.91, a convergence speed of 420 s, and a low latency of 42 ms, the proposed algorithm surpasses existing methods such as TA, RA, SSR, CNN-LSTM, RLA, and RSR. Simulation results corroborate the efficacy of SecureScanML in mitigating vulnerabilities without compromising network efficiency. The algorithm strikes a fine balance between proactive vulnerability management and network performance preservation. Moreover, the study explores the impact of security-performance weight parameters on the algorithm's behavior, providing valuable insights for fine-tuning the system to achieve specific security and performance objectives. Notably, for a security-performance weight of 0.5, the algorithm demonstrates high throughput and vulnerability reduction alongside low latency. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Combined Sweeping and Jumping Method to Enhance Node Insertion Algorithm for Wi-Fi Sensor Networks.
- Author
-
Choi, Woo-Yong
- Subjects
WIRELESS Internet ,WIRELESS LANs ,TELECOMMUNICATION ,SENSOR networks ,INFRASTRUCTURE (Economics) ,WIRELESS sensor networks - Abstract
Two dominant driving forces for evolving communication technologies in the current society have been the proliferation of wireless access networks to the Internet and the broadbandization of access and infrastructure networks. Through these evolutions of communication technologies, high-resolution contents are instantly delivered to wireless devices such as mobile phones, wireless tablets, and headsets. Recently, wireless sensor networks, where up to 1000 low-power sensors are wirelessly connected to each other, have been created and connected to the Internet, which presents a new challenge of efficiently coordinating the transmissions of many wireless sensors with minimal transmission overheads. Developing an efficient Medium Access Control (MAC) protocol governing the transmissions of wireless sensor networks is crucial for the success of wireless sensor networks for the realization of the Internet of Things (IoT). In 2023, the node insertion algorithm was proposed to efficiently derive the minimal number of serially connected multipolling sequences of many wireless sensors, by which Access Points (APs) can poll wireless sensors with minimal polling overheads. In this paper, the combined sweeping and jumping method is presented to dramatically enhance the searching performance of the node insertion algorithm. To validate the performance of the combined sweeping and jumping method, simulation results are presented for wireless sensor networks where wireless sensors with varying transmission ranges exist. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
5. Strip-Radiator and Reflector Based Multi-Layered CPW-Fed Antenna for Tracking Application.
- Author
-
Pawase, Trupti N., Mahajan, Anurag, and Malhotra, Akshay
- Subjects
GLOBAL Positioning System ,ANTENNAS (Electronics) ,ANTENNA design ,REFLECTANCE ,SUBSTRATES (Materials science) ,WIRELESS LANs - Abstract
This communication presents the design analysis and development of a compact, dual-band, circularly polarized, multilayer antenna for global positioning system (GPS), wireless local area network (WLAN), and Industrial Scientific, and Medical (ISM) applications. The antenna comprises two etched strip radiator and reflector layers on two Kapton substrates situated at a vertical distance of 18.47 mm. The inverted U-strip results in WLAN/ISM band from 2.30–2.62 GHz whereas the semi-circular arc-strip is responsible for generating the lower band from 1.46 to 1.73 GHz. The bottom surface reflector plane is applied below the main antenna radiator which results in a unidirectional radiation pattern with improved front-to-back ratio (FBR), antenna gain, radiation efficiency, and specific absorption rate (SAR). The reflector contains an inner square ring with a circular center ring. The reflection coefficient below −10 dB fractional bandwidth (FBW) is suitable for GPS/ISM/WLAN/Wi-Fi/Bluetooth etc operations. The maximum gain of 5.82 dBi is obtained at a frequency of 2.80 GHz. The antenna is designed on a flexible Kapton substrate of a size 28 × 31 mm². The SAR values below 0.01 W/kg and 0.02 W/kg are obtained at two resonance frequencies 1.60 GHz and 2.41 GHz, respectively. Therefore, the designed antenna is most suitable for indoor/outdoor wearable tracking purposes and also for medical applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
6. An AMC-Backed Dual-Band Gain-Enhanced Wearable Antenna with Low SAR for WLAN/WBAN Applications.
- Author
-
Reddy, Regalla Narendra, Koteswara Rao, Nalam V., and Krishna, Dasari Rama
- Subjects
WIRELESS LANs ,BODY area networks ,ANTENNAS (Electronics) ,WEARABLE antennas ,TELECOMMUNICATION - Abstract
The advancement of wireless communication technology demands antennas that can achieve significant gain while functioning across diverse frequency ranges. Numerous studies have aimed to enhance the gain and radiation properties of such antennas. However, when these antennas operate near the human body, their performance regarding return loss, gain, radiation pattern, and specific absorption rate (SAR) are influenced by the interaction and absorption of human tissue. To enhance overall antenna performance, artificial magnetic conductor (AMC) surfaces have been introduced. Numerous studies have been conducted to improve antenna performance through the use of AMC surfaces. This paper proposes a coplanar waveguide (CPW)-fed wearable antenna integrated with an AMC array. The integrated antenna is expected to operate at both 2.45 GHz and 5.5 GHz, making it suitable for applications in wireless local area networks (WLAN) and wireless body area networks (WBAN). The study focuses on the benefits of the integrated antenna, highlighting advantages such as improved gain and lowered SAR in comparison to the antenna alone. These improvements are validated through both simulated and measured outcomes. This antenna, featuring a simple feed structure, low cost, and ease of fabrication, is a promising option for wearable medical applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
7. Design and Analysis of Tapered Slot Vivaldi Antenna for 5G mm‐Wave Applications.
- Author
-
Kokez, Husam Al‐Deen F., Aloulou, Rahma, and Mnif, Hassene
- Subjects
- *
SLOT antennas , *ANTENNAS (Electronics) , *ELECTRICAL engineers , *INTEGRATED software , *5G networks , *WIRELESS LANs - Abstract
In this paper, a planar of small size Tapered slot Vivaldi antenna for mm‐Wave 5G application is proposed. The main goal can be presented by designing of a small size antenna with good performance antenna for mmWave and massive MIMO applications. The suggested antenna structure is portrayed by a size of 6.4 × 6 × 0.254 mm3 printed on a dielectric substrate (Roger/RT Duroid −5880) with εr = 2.2, and tanδ = 0.0009. The antenna displayed a small size and good performance with an impedance bandwidth equals 17.9 GHz ranging from 22.1 GHz to 40 GHz with the value of S11<−10 dB, which covers all mm‐Wave frequency bands. The antenna gain is found fluctuating from 6.2 dB up to 7.1 dB in the whole band, which the maximum gain value is found at 22.1 GHz. The radiation of the antenna is found the end‐fire type. The HFSS software package was used to design and simulate the proposed antenna structure. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
8. Secure Triggering Frame-Based Dynamic Power Saving Mechanism against Battery Draining Attack in Wi-Fi-Enabled Sensor Networks.
- Author
-
Kim, So-Yeon, Park, So-Hyun, Lee, Jung-Hoon, and Lee, Il-Gu
- Subjects
- *
SENSOR networks , *ENERGY consumption , *SECURITY systems , *INTERNET of things , *CONSUMPTION (Economics) , *WIRELESS LANs - Abstract
Wireless local area networks (WLANs) have recently evolved into technologies featuring extremely high throughput and ultra-high reliability. As WLANs are predominantly utilized in Internet of Things (IoT) and Wi-Fi-enabled sensor applications powered by coin cell batteries, these high-efficiency, high-performance technologies often cause significant battery depletion. The introduction of the trigger frame-based uplink transmission method, designed to enhance network throughput, lacks adequate security measures, enabling attackers to manipulate trigger frames. Devices receiving such frames must respond immediately; however, if a device receives a fake trigger frame, it fails to enter sleep mode, continuously sending response signals and thereby increasing power consumption. This problem is specifically acute in next-generation devices that support multi-link operation (MLO), capable of simultaneous transmission and reception across multiple links, rendering them more susceptible to battery draining attacks than conventional single-link devices. To address this, this paper introduces a Secure Triggering Frame-Based Dynamic Power Saving Mechanism (STF-DPSM) specifically designed for multi-link environments. Experimental results indicate that even in a multi-link environment with only two links, the STF-DPSM improves energy efficiency by an average of approximately 55.69% over conventional methods and reduces delay times by an average of approximately 44.7% compared with methods that consistently utilize encryption/decryption and integrity checks. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
9. Enhancing Indoor Localization Accuracy through Multiple Access Point Deployment.
- Author
-
Aziz, Toufiq and Insoo, Koo
- Subjects
WIRELESS LANs ,STANDARD deviations ,RADIO frequency ,MACHINE learning ,LOCALIZATION (Mathematics) - Abstract
This study addresses the limitations of wireless local area networks in indoor localization by utilizing Extra-Trees Regression (ETR) to estimate locations based on received signal strength indicator (RSSI) values from a radio environment map (REM). We investigate how integrating numerous access points can enhance indoor localization accuracy. By constructing an extensive REM using RSSI data from various access points collected by a mobile robot in the intended interior setting, we evaluate several machine learning regression techniques. Our research pays special attention to an optimized ETR model, validated through 10-fold cross-validation and hyperparameter tuning. We quantitatively evaluate the efficiency of our suggested multi-access-point approach using root mean square error (RMSE) for REM evaluation and location error metrics for accurate localization. The results show that incorporating multiple access points significantly improves indoor localization accuracy, providing a substantial improvement over single-access-point systems when assessing interior radio frequency environments. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
10. Metamaterial Inspired Stub-Incorporated Quad-Band Diamond Shaped Monopole Antenna for Satellite and Wireless Application.
- Author
-
Jansirani, G and Raj, R Gandhi
- Subjects
- *
MONOPOLE antennas , *TELECOMMUNICATION satellites , *ANTENNAS (Electronics) , *ANTENNA design , *METAMATERIALS , *IEEE 802.16 (Standard) , *WIRELESS LANs - Abstract
This study presents a quad-band stub-incorporated split octagonal ring antenna specifically designed for wireless applications that rely on satellite communication. The antenna is fabricated on an FR4 substrate with dimensions of 26×21×1.6 mm³ and its performance is simulated using the CST EM Studio software. The device operates in the frequency range from 2.15 GHz to 6.35 GHz, using stub integration and gap modification to achieve resonant bands. The antenna has resonant frequencies of 2.23 GHz, 3.28 GHz, 4.77 GHz, and 5.89 GHz, with corresponding bandwidths of 153 MHz, 9011 MHz, 7692 MHz, and 6813 MHz, respectively. The parametric analysis optimizes the values of the design parameters, while the experimental validation shows the consistency between the measured and simulated results. The antenna is characterized by a small size, a consistent radiation pattern and a wide range of applications including ISM, WIFI, WLAN, WIMAX, 5G, and C-Band Satellite. The device is capable of operating in two frequency bands and consistently maintains a gain of over 1 dBi across its resonating range. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
11. Compact reconfigurable antenna with pattern diversity for K band applications.
- Author
-
Rawal, Pallav and Rawat, Sanyog
- Subjects
- *
ANTENNA radiation patterns , *PIN diodes , *ANTENNAS (Electronics) , *WIRELESS LANs - Abstract
Summary: A novel pattern reconfigurable antenna is proposed in this letter. The overall dimension of the antenna is 11 × 11 × 0.787 mm. The proposed antenna is fabricated on Rogers RO4003C substrate. The antenna has two meandered monopoles and two straight monopoles. Two PIN diodes are connected between meandered monopoles and feed. The proposed design has three states of switching, that is, ON‐ON, ON‐OFF, and OFF‐ON. The antenna radiates from 18.5 to 26.25 GHz band with more than 5 GHz (−10 dB) bandwidth for all states. The proposed geometry exhibits 270° radiation beamwidth with 45° and 135° directions for ON‐OFF and OFF‐ON state, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
12. An inverted U‐shaped merged stubs hexa‐band 4‐element MIMO antenna for advanced wireless applications.
- Author
-
Addepalli, Tathababu, Vidyavathi, Thota, Chakradhar, Karnam Serkadu, Babu, Kommanaboyina Vasu, Nella, Anveshkumar, and Chebrolu, Manohar Kumar
- Subjects
- *
ANTENNAS (Electronics) , *WIRELESS LANs , *5G networks , *RADIATORS , *RADIATION - Abstract
Summary: A four‐element hexa‐band inverted U‐shaped merged stubs miniaturized Multiple‐Input Multiple‐Output (MIMO) radiator, operating in 2.10–2.17 GHz for 3G (2.17 GHz) band, 2.52–2.60 GHz for 4G (2.5 GHz) band, 3.31–3.46 GHz for 5G (3.4 GHz [n77 and n78]) bands, 3.66–3.72 GHz for 5G (3.7 GHz [n77 and n78]) bands, 4.53–4.62 GHz for 5G (4.5 GHz [n79]) band, and 5.15–6.02 GHz for 5.5 GHz WLAN bands, is developed. The radiator and ground planes comprise of multiple inverted U‐shaped stubs and slots to form the proposed configuration having overall compact dimensions of 62 × 62 × 1.6 mm3. The peak gain and radiation efficiency of the antenna are found to be 1.31 dBi and 77.48% at 2.17 GHz, 0.98 dBi and 63.3% at 2.55 GHz, 2.9 dBi and 71.13% at 3.38GHz, 1.6 dBi and 66.68% at 3.68 GHz, 2.58 dBi and 77% at 4.57 GHz, and 3.27 dBi and 68.68% at 5.52GHz. The arrangement of four antenna elements is orthogonal (rotationally symmetric) to minimize the mutual coupling, and hence, a minimum isolation of more than 15 dB is noted between all the antenna ports. Furthermore, Envelope Correlation‐Coefficient (ECC) in desired bands is lower than 0.012. Channel Capacity‐Loss (CCL) and Diversity‐Gain (DG) are also good with 0.015 bits/s/Hz and 9.96 dB, respectively. The fabricated structure measurement results agree well with simulation outcomes. These facts result that the proposed MIMO structure is a promising module for the usage in WLAN, 4G, and 5G band applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
13. An Enhanced Active Access-Point Configuration Algorithm Using the Throughput Request Satisfaction Method for an Energy-Efficient Wireless Local-Area Network.
- Author
-
Wu, Bin, Funabiki, Nobuo, Kong, Dezheng, Wang, Xuan, Seto, Taishiro, and Fan, Yu-Cheng
- Subjects
- *
RASPBERRY Pi , *INTERNET access , *SATISFACTION , *ENERGY consumption , *ALGORITHMS , *WIRELESS LANs - Abstract
Wireless Local-Area Networks (WLANs), as a popular internet access solution, are widely used in numerous places, including enterprises, campuses, and public venues. As the number of devices increases, large-scale deployments will cause the problem of dense wireless networks, including a lot of energy consumption. Thus, the optimization of energy-efficient wireless AP devices has become a focal point of attention. To reduce energy consumption, we have proposed the active access-point (AP) configuration algorithm for WLANs using APs with a dual interface. This uses the greedy algorithm combined with the local search optimization method to find the minimum number of activated APs while satisfying the minimum throughput constraint. However, the previous algorithm basically satisfies only the average throughput among the multiple hosts associated with one AP, wherein some hosts may not reach the required one. In this paper, to overcome this limitation, we propose an enhanced active AP configuration algorithm by incorporating the throughput request satisfaction method that controls the actual throughput at the target value (target throughput) for every host by applying traffic shaping. The target throughput is calculated from the single and concurrent communicating throughput of each host based on channel occupancy time. The minimum throughput constraint will be iteratively adjusted to obtain the required target throughput and achieve the fair throughput allocation. For evaluations, we conducted simulations using the WIMNET simulator and experiments using the testbed system with a Raspberry Pi 4B for APs in four topology cases with five APs and ten hosts. The results show that the proposed method always achieved the required minimum throughput in simulations as well as in experiments, while minimizing the number of active APs. Thus, the validity and effectiveness of our proposal were confirmed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
14. Enhancing Indoor Positioning Accuracy with WLAN and WSN: A QPSO Hybrid Algorithm with Surface Tessellation.
- Author
-
Scavino, Edgar, Abd Rahman, Mohd Amiruddin, Farid, Zahid, Ahmad, Sadique, and Asim, Muhammad
- Subjects
- *
WIRELESS LANs , *WIRELESS sensor networks , *GLOBAL Positioning System , *PARTICLE swarm optimization , *TILES - Abstract
In large indoor environments, accurate positioning and tracking of people and autonomous equipment have become essential requirements. The application of increasingly automated moving transportation units in large indoor spaces demands a precise knowledge of their positions, for both efficiency and safety reasons. Moreover, satellite-based Global Positioning System (GPS) signals are likely to be unusable in deep indoor spaces, and technologies like WiFi and Bluetooth are susceptible to signal noise and fading effects. For these reasons, a hybrid approach that employs at least two different signal typologies proved to be more effective, resilient, robust, and accurate in determining localization in indoor environments. This paper proposes an improved hybrid technique that implements fingerprinting-based indoor positioning using Received Signal Strength (RSS) information from available Wireless Local Area Network (WLAN) access points and Wireless Sensor Network (WSN) technology. Six signals were recorded on a regular grid of anchor points covering the research surface. For optimization purposes, appropriate raw signal weighing was applied in accordance with previous research on the same data. The novel approach in this work consisted of performing a virtual tessellation of the considered indoor surface with a regular set of tiles encompassing the whole area. The optimization process was focused on varying the size of the tiles as well as their relative position concerning the signal acquisition grid, with the goal of minimizing the average distance error based on tile identification accuracy. The optimization process was conducted using a standard Quantum Particle Swarm Optimization (QPSO), while the position error estimate for each tile configuration was performed using a 3-layer Multilayer Perceptron (MLP) neural network. These experimental results showed a 16% reduction in the positioning error when a suitable tile configuration was calculated in the optimization process. Our final achieved value of 0.611 m of location incertitude shows a sensible improvement compared to our previous results. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
15. Downlink AP coordination based OFDMA and NOMA protocols for the next-generation WLANs.
- Author
-
Zhenzhen, Yan, Bo, Li, Mao, Yang, and Zhongjiang, Yan
- Subjects
- *
FREQUENCY division multiple access , *INTERFERENCE suppression , *STRUCTURAL frames , *ACCESS control , *WIRELESS LANs - Abstract
In recent years, with the increasing number of terminal connections, high-density deployment scenarios have become important scenarios for future wireless networks. Ultra-high throughput (EHT) in high density deployment scenarios is the technical goal of IEEE 802.11be, the next-generation wireless local area network (WLAN) standard. However, in a high-density deployment scenario, interference suppression between BSSs is serious, which seriously affects the throughput of a WLAN. And the resources available are limited. Therefore, for the next generation WLAN standard, this paper proposes a downlink transmission scheme based on AP coordination and the orthogonal frequency division multiple access (OFDMA) protocol and the non-orthogonal multiple access (NOMA) protocol, named Co-OFDMA–NOMA scheme. The core idea is to transform the interference and suppression relationship between neighboring BSSs into the relationship of mutual coordination and assistance through the Co-OFDMA–NOMA protocol proposed in this paper. Firstly, a downlink transmission scheme named the Co-OFDMA–NOMA protocol is designed. In addition, the protocol and its framework structure have good backward compatibility. Theoretical analysis shows that the proposed Co-OFDMA–NOMA protocol has significant performance gain, and simulation results prove the effectiveness of the scheme. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
16. Design monopole antenna of ultra-wideband high bandwidth and high efficiency for ground penetrating radar application.
- Author
-
ALtalqi, Fatehi, Fennane, Sara, Mabchour, Hamza, Kacimi, Houda, and Echchelh, Adil
- Subjects
- *
GROUND penetrating radar , *ANTENNA design , *MONOPOLE antennas , *WIRELESS LANs , *ULTRA-wideband antennas , *COMPUTER engineering , *ANTENNA feeds - Abstract
Over the past years, remote sensing, radar, and imaging applications have all made use of ultra-wideband (UWB) technology. This study undertakes an extensive analysis of tree-shaped monopole antennas tailored for UWB systems. The intended antenna has an incomplete ground plane and a circular radiating patch. To increase bandwidth, two ears have been added to the circular structure. Possessing a dielectric constant of 4.3. The antenna substrate consists of FR-4 material with a dielectric constant of 4.3. To achieve optimal impedance matching for UWB systems, the antenna is fed via a coplanar waveguide (CPW). Design antenna is a simple structure, small size, easy design, and simple integration with the substrate with dimensions of 54 mm ×36 mm ×1.6 mm. All simulation results presented in this article were generated using computer simulation technology (CST) software. He monopole antenna exhibits an impressive impedance bandwidth of 9.6 GHz (146.68%), spanning from 1.99 GHz to 11.56 GHz. Furthermore, the simulated UWB circular monopole antenna exhibits omnidirectional radiation characteristics, boasting a peak gain of 8 dB, and a directivity of 8.2 dBi at the frequency of 5 GHz, and a remarkable radiation efficiency of 97%. With these attributes, the suggested monopole UWB antenna shows significant potential for ground penetrating radar (GPR) applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
17. For wireless applications, design and analysis of patch antenna at 2.45 GHz.
- Author
-
Sohel Rana, Md., Haider Ovi, Shake Zion, Tanvir Ul Islam, A. S. M., Mistry, Piyal, Shipon, Sahriar Islam, Jahidur Rahaman, Md., Shahriar Rakib, Md., and Faruq, Omar
- Subjects
- *
ANTENNAS (Electronics) , *COMPUTER engineering , *ANTENNA design , *MICROSTRIP antennas , *STANDING waves , *WIRELESS LANs - Abstract
This research designs, analyzes, and studies a 2.45 GHz rectangular microstrip patch antenna (RMPA). The antenna design uses Rogers RT5880 (lossy) substrate material with 2.2 dielectric permittivity, 1.5 mm thickness, and 0.0009 loss tangent. Additionally, the antenna was designed and simulated using computer simulation technology (CST) studio 2019 software. Plot designs were again created using Origin Pro Software. The simulation results showed that the return loss (S11), voltage standing wave ratio (VSWR), gain, directivity, bandwidth, efficiency, and surface current were -45.992 dB, 1.0101, 6.115 dBi, 6.534 dBi, 70.8 MHz, 93.59%, and 49.9 A/m, respectively. This paper aims to increase return loss to a typical VSWR value near 1. Besides boosting antenna gain, directivity, and efficiency, it can be used in future wireless applications, including mobile phones and wireless LANs. The proposed antenna design outperforms earlier experiments, demonstrating that the research has increased performance. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
18. A Compact Four-Element MIMO Antenna for 5 G Millimeter-Wave (37–39 GHz) Applications.
- Author
-
Ramanathan, Srividhya and Maria, Anto Bennet
- Subjects
- *
ANTENNAS (Electronics) , *TECHNOLOGICAL innovations , *WIRELESS LANs , *TELECOMMUNICATION systems - Abstract
This study introduces an innovative four-port millimeter-wave (mm-wave) Multiple Input Multiple Output (MIMO) antenna tailored for 5 G applications. Fabricated with a compact size of 25 mm x 25 mm, the antenna employs Rogers RT Duroid 5880 material, which has a thickness of 0.8 mm. This research introduces a high-gain, compact MIMO antenna addressing limitations discussed in related literature, operating at 37–39 GHz and ideal for mm-wave applications due to its small size, low profile, and efficient radiation capability. The antenna operates in the range of 37–39 GHz, with an impressive 10 dB impedance bandwidth. Impressively, the isolation among antenna elements reaches 25 dB, achieved by maintaining an edge-to-edge distance between elements of just 5.45 mm and employing orthogonal arrangements. Through rigorous experimentation, the antenna demonstrates substantial performance metrics, achieving directivity and gain of up to 8 dB and 5 dB, respectively. The fabricated antenna undergoes thorough measurement, and all results are found to be well-correlated with simulated results. This emphasizes the reliability and accuracy of the proposed design. The study establishes the antenna as a suitable contender for future mm-wave applications, providing valuable insights into the potential of compact MIMO configurations in the high-frequency spectrum. The achieved performance metrics and reliable measurements position the proposed design as a promising candidate for advancing communication systems and emerging technologies in the mm-wave domain [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
19. A Dual-Notched Ultra-Wideband Monopole Antenna Based on Frequency Selective Surface Technology.
- Author
-
Yingjie Du and Mingxin Liu
- Subjects
ULTRA-wideband communication ,MONOPOLE antennas ,WIRELESS communications ,FREQUENCY selective surfaces ,ANTENNAS (Electronics) ,ULTRA-wideband antennas ,IEEE 802.16 (Standard) ,WIRELESS LANs - Abstract
To solve the problem of antenna miniaturization and mutual interference between the communication band of the UWB system and other wireless communication system bands, this paper proposes a UWB monopole antenna which has frequency notch characteristics. By applying two pairs of Split Ring Resonator (SRR) structures on a CPW transmission line, a coupling resonance is generated in a specific frequency band, and the antenna has a dual frequency notch and a wide band notch function. The measured results show that the antenna has good band-notch characteristics in the frequency ranges of 3.3 GHz to 4 GHz and 5.1 GHz to 6.2 GHz, suppressing ultra-wideband interference between WiMAX (3.3 GHz ~ 3.8 GHz) and WLAN (5.15 GHz ~ 5.35 GHz and 5.725 GHz ~ 5.825 GHz) in a wireless communication system. The volume of the antenna is 40 mm × 36 mm × 1 mm, and the measured results are compared with the simulated model results. Besides, the measured and simulated results have a good consistency. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
20. Lightweight log-monitoring-based mitigation tool against WLAN attacks.
- Author
-
Saifan, Ramzi, Radi, Mohammad, Al-Dabbagh, Hamsa, and Mansour, Badr
- Subjects
COMPUTER network security ,USER interfaces ,SECURITIES trading ,WIRELESS LANs - Abstract
Wireless network attacks are some of the most common network security threats dealt with daily. Their ease of execution and effectiveness make them commonplace within most public networks. The goal of this paper is to develop a tool which provides defenses against these attacks, one which can also generate the attacks to test its own effectiveness in defending against them. The research involved the design, testing, and implementation of attacks/defenses tool, which benefits from a user-friendly user interface that simplifies the testing process. The attacks were generated using existing tools, linked to one central interface. The defense methodology was scriptbased and created entirely from scratch. It was also linked to a single interface which continuously monitors logs to detect and prevent attacks in an efficient timely manner. The results showed that the proposed defenses to the studied wireless attacks were effective at mitigation, or outright prevention. They were also more lightweight than existing solutions, making them more appealing for less powerful hardware. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
21. Design and analysis of a small size triple band printed antenna for 3G/4G/5G/future 5.8G IoT applications.
- Author
-
Mandal, Tapan and Mondal, Pratik
- Subjects
- *
ANTENNAS (Electronics) , *WIRELESS LANs , *INTERNET of things , *CURRENT distribution , *5G networks , *MONOPOLE antennas - Abstract
Summary: This paper presents a compact (20 × 20 × 1.59 mm3), (0.34λg × 0.34λg × 0.01λg at 2.4 GHz) triple band monopole antenna for Internet of Things (IoT) applications. The geometry of the antenna consists of (i) U‐shape monopole with feed line, (ii) stubs, and (iii) modified ground to achieve three independent operating bands ranging from (i) 2.4–2.48 GHz for industrial, scientific, and medical (ISM)/3G; (ii) 3.4–3.6 GHz for 4G/5G; and (iii) 5.725–5.825 GHz for 5.8G Wi‐Fi/extended 5G. Various parameters, input impedance, and current distribution of the proposed structure are carried out to investigate the effects of stub, ground plane and analyze the radiation. The measured result covers the three individual bands in range of 2.38–2.48 GHz, 3.41–3.61 GHz, and 5.76–6.04 GHz, respectively, and exhibits stable omnidirectional radiation patterns, acceptable antenna gain, and efficiency in the operating bands. The experimental result of the fabricated antenna closely matches with the simulated result. Therefore, satisfactory result ensures its ability to work for 3G/4G/5G/extended 5G IoT portable applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
22. Development and investigation of a compact band-notched MIMO antenna attaining wideband isolation for UWB applications.
- Author
-
Banerjee, Jeet, Gorai, Abhik, and Ghatak, Rowdra
- Subjects
- *
ULTRA-wideband antennas , *ANTENNAS (Electronics) , *MONOPOLE antennas , *WIRELESS LANs , *STATISTICAL correlation , *REFLECTANCE , *RADIATORS - Abstract
The sequential layout of a portable ultra-wideband (UWB) monopole antenna, transforming into a compact band-notch (3.15–4.3 GHz rejecting the Wi-Max and the C-Band) multiple-input multiple-output (MIMO) antenna is described in this paper. The diversity layout is designed within a compact size of 39 (l) × 18 (W) mm2. Due to the opposite orientation of the two radiators in the diversity configuration and the use of a rectangular parasitic strip near the feed lines, high and wideband isolation (of >20 dB) is attained over the entire UWB spectrum. The proposed layout depicts a stable omnidirectional radiation pattern and a maximal gain of 1.82 dB. The envelope correlation coefficient (ECC) is found to be below 0.18 for the entire UWB spectrum. Empirical verifications in terms of vital diversity parameters and analogy with competing layouts strengthen the candidature of the intended MIMO layout for UWB wireless portable applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
23. Enhancement of VoWiFi cell capacity using A‐MPDU frame aggregation technique in WiFi 6 considering VBR traffic.
- Author
-
Chinmay, Ayes and Kumar Pati, Hemanta
- Subjects
- *
WIRELESS LANs , *IEEE 802.11 (Standard) , *TELECOMMUNICATION , *NETWORK performance , *WIRELESS communications , *COMMUNICATION of technical information , *ACCESS control - Abstract
Summary: The rapid growth in wireless communication technology and the proliferation of multimedia applications, specifically Voice over Wireless Fidelity (VoWiFi), necessitate the exploration of innovative techniques for improving network performance and quality‐of‐service (QoS). This research paper presents an innovative approach to enhance VoWiFi cell capacity using aggregate medium access control protocol data unit (A‐MPDU) frame aggregation for variable bit rate (VBR) traffic. In this research article, we investigated the effect that the retransmission of voice packets has on the cell capacity of a wireless local area network (WLAN) standard that provides VoWiFi service while taking into account the A‐MPDU approach. When taking into consideration the constant bit rate (CBR) and VBR traffics, we compared the results obtained using WiFi 6 (i.e., IEEE 802.11ax) with older WLAN standards such as IEEE 802.11b/g/n/ac. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
24. High performance and compact antenna with new scheme for broadband circular polarisation applications.
- Author
-
Javanshir, Amir Mohammad, Aribi, Tohid, Sedghi, Tohid, and Kalami, Arash
- Subjects
- *
BROADBAND antennas , *ANTENNAS (Electronics) , *WIRELESS LANs , *IEEE 802.16 (Standard) , *ANTENNA design , *IMPEDANCE matching , *CURRENT distribution - Abstract
In this research paper, the authors propose a unique broad-band circularly polarised antenna design with a sequentially rotated feed network intended for applications in the WiMAX IEEE 802.16, C-band, and ITU-R F386.9 bands. A sequential feeding approach utilising transmission lines with varying impedance properties and lengths has been utilised to properly stimulate the amplitude and phase distribution of each radiation element. To facilitate the rotation of the surface current distribution on the ground plane and further improve impedance matching, four L-shaped slits have been inserted into each corner of the ground plane along with a pair of mirrored slits of identical geometry within the antenna ground plane. The individual antenna element achieves an impedance bandwidth between 5–6.8 GHz and a 3 dB axial ratio bandwidth from 5.1–6.6 GHz. To additionally advance the radiation performance, the elements are configured into a 2 × 2 antenna and are interconnected utilising a sequentially rotated feeding network to attain broader axial ratio and impedance bandwidths. A key benefit of the implemented feed network is the minimisation of coupling effects between elements. To significantly increase the performance metrics of the antenna with limited increase to its physical size, electromagnetic band gap structures were incorporated as a one-dimensional lattice between the radiating elements. For the resulting antenna, an axial ratio bandwidth from 4.19 to 6.8 GHz (48%) and an impedance bandwidth spanning 2.9 to 9.8 GHz (102%) are achieved. The peak gain of the antenna is 11.2 dBic. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
25. Design and Analysis of a Concentric Ring Based Split Ring Monopole Antenna with Characteristic Mode Analysis (CMA) for IoT Communication Applications.
- Author
-
Bhavani, K. Durga, Islam, Tanvir, Madhav, B. T. P., Das, Sudipta, Chintalapati, S. Sowjanya, and Aradhyula, Raghavaraju
- Subjects
WIRELESS LANs ,TELECOMMUNICATION ,INTERNET of things ,MONOPOLE antennas ,WIRELESS Internet ,ANTENNAS (Electronics) ,ULTRA-wideband antennas ,CURRENT distribution - Abstract
Significant advancement has been witnessed in the field of modern communication technology in last decade. Several wireless systems such as Wireless LAN, Wireless Fidelity (Wi-Fi) etc. are popular to connect devices to facilitate communication between them through internet technology. To access much faster communication, higher data rates are highly sought after with the upgradation of mobile communication generations (1G to 5G). Wideband/multiband antennas usually support multiple devices to get connected over a broad range of communication. As a benchmark of next generation communication technology, Internet of Things (IOT) is gaining a huge popularity in the field of wireless network. It ensures faster and secure communication among devices and cloud with high data rate. With this aim, we have proposed a new monopole antenna for IOT applications. The design consists of a new concentric ring based split ring patch and partial ground plane. It is implemented with characteristic mode analysis. The designed antenna operates in the ultra-wideband region with multiband characteristics at four bands of (1.5-1.9 GHz), (3.9- 4.2 GHz), (5.9-6.9 GHz) and (7.4-11.8 GHz) to cover for various IoT communication applications. The suggested design is inspected using analysis of characteristic mode, characteristic angle, eigen values, and modal significance. The distribution of surface current for the proposed circular shaped patch antenna is analyzed for mode of propagation by the theory of characteristic modes (CMA). [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
26. Design and Analysis of Two Element Modified Circular Shaped MIMO Antenna for 5G Application.
- Author
-
Kumutha, D., Islam, T., Muthumari, P., Vijayalakshmi, K., Rajalakshmi, R., and Indumathi, M.
- Subjects
ANTENNAS (Electronics) ,WIRELESS LANs ,MIMO systems ,TELECOMMUNICATION systems ,5G networks ,DATA transmission systems ,MICROSTRIP antennas - Abstract
Printed antenna technology gained has become centre of attraction for designing MIMO antenna system for future communication applications. Antenna is an essential component for 5G communication system. MIMO technology is highly preferrable due to high data rate and simultaneous data transmission establishment. In this article, a curved slot incorporated circular shaped antenna is constructed and tested for performance utilizing conventional ground planes in an eventual Fifth Generation (5G) mobile communication network. The proposed single element system is operating from 2.6 to 12.9 GHz with an 85.84% efficiency throughout the band. The substrate of the radiator is 30 mm 30 mm 1.6 mm, where a circular patch is used whose size is 9.35 mm. A partial ground structure of 30 mm 10 mm is used to obtain high efficiency and wide bandwidth. The structured antenna system has a maximum directivity of 4.8, efficiency of 89%, and maximum gain of 1.68 dB which are desired in any MIMO system to tolerate interference and maintain user bandwidth. The proposed micro strip patch two element antenna covers 10 dB return loss frequencies from 2.6 GHz to 11.8 GHz than the conventional method. The total size of the MIMO antenna system is 70 mm 60 mm 1.6 mm. The 2-element MIMO antenna simulated results are determined by the HFSS software with their performance. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
27. Curvature-Adaptive Compact Triple-Band Metamaterial Uniplanar Compact Electromagnetic Bandgap-Based Printed Antenna for Wearable Wireless and Medical Body Area Network Applications.
- Author
-
Messatfa, Tarek, Berhab, Souad, Chebbara, Fouad, and Soliman, Mohamed S.
- Subjects
BODY area networks ,METAMATERIAL antennas ,WEARABLE antennas ,ANTENNAS (Electronics) ,WIRELESS LANs ,HUMAN body - Abstract
A novel, compact, monopole apple-shaped, triple-band metamaterial-printed wearable antenna backed by a uniplanar compact electromagnetic bandgap (UC-EBG) structure is introduced in this paper for wearable wireless and medical body area network (WBAN/MBAN) applications. A tri-band UC-EBG structure has been utilized as a ground plane to minimize the impact of antenna radiation on the human body and improve antenna performance for the proposed wearable antenna. Metamaterial triangular complementary split ring resonators (TCSRRs) are incorporated into the antenna and UC-EBG structure, resulting in a compact UC-EBG-backed antenna with an overall size of 39 × 39 × 2.84 mm
3 (0.41 λg × 0.41 λg × 0.029 λg ). The printed textile antenna operates at 2.45 GHz for the wireless local area network (WLAN), 3.5 GHz for 5G new radio (NR), and 5.8 GHz for the industrial, scientific, and medical (ISM) bands with improved gain and high-efficiency values. Furthermore, the performance of the antenna is analyzed on the human body, where three models of curved body parts are considered: a child's arm (worst case) with a 40 mm radius, an adult's arm with a 60 mm radius, and an adult's leg with a 70 mm radius. The results demonstrate that the proposed antenna is an attractive candidate for wearable healthcare and fitness monitoring devices and other WBAN/MBAN applications due to its compact size, high performance, and low SAR values. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
28. Adaptive Antennas for the Wireless Future: Design, Analysis, and Performance Evaluation of Frequency Reconfigurable.
- Author
-
Suman, Prem Nath and Mishra, Gajendra Kant
- Subjects
ADAPTIVE antennas ,TELECOMMUNICATION satellites ,TELECOMMUNICATION ,ANTENNAS (Electronics) ,WIRELESS communications ,WIRELESS LANs - Abstract
This research paper covers a comprehensive investigation into the design, analysis, and performance evaluation of frequency reconfigurable antennas. The relentless advancement of wireless communication technology has necessitated the development of antennas that can adapt seamlessly to a wide range of operating frequencies. The proposed antenna design incorporates a circular ring configuration with a PIN diode for dynamic frequency tuning. The reconfigurable element allows for versatile operation across multiple frequency bands, avoiding the requirement for separate antennas and simplifying system integration. The performance evaluation encompasses key parameters such as radiation pattern, gain, bandwidth, and efficiency, assuring optimal performance across the specified frequency range. The measured and simulated results validate the accuracy and effectiveness of the recommended structure. The research findings contribute to the state-of-the-art advancements in frequency reconfigurable antenna engineering, enabling efficient wireless communication systems for several applications, such as cellular networks, WLANs, satellite communication systems, and cognitive radio networks. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
29. Dual-Wideband MIMO Antenna with Eight Elements for 5G and WLAN Communication.
- Author
-
Lingrong Shen, Jianlin Huang, Qiangjuan Li, Tian Hong Loh, and Gui Liu
- Subjects
WIRELESS LANs ,ANTENNAS (Electronics) ,5G networks ,ANTENNA design - Abstract
This paper presents a compact 8×8 multiple-input-multiple-output (MIMO) antenna system designed to operate across two wide frequency bands suitable for fifth-generation (5G) mobile network and wireless local area network (WLAN) applications. Each antenna element comprises a radiator, a feeding line, and a defected ground plane. Each radiator consists of a first L-shaped radiator (FLR), a second L-shaped radiator (SLR), and an extra radiator (ER). To enhance the isolation, a defected ground structure (DGS) is employed between the antenna elements. The presented antenna operates across three frequency bands, namely, 3.5 GHz (3.3 GHz-3.8 GHz) and 4.9 GHz (4.8 GHz-5 GHz) 5G frequency bands, and 5.7 GHz (5.15 GHz-5.85 GHz) WLAN frequency band, exhibiting excellent isolation, surpassing 15 dB in both lower and higher frequency bands. The overall efficiency exceeds 58%, with an envelope correlation coefficient (ECC) value below 0.125. The simulation and measurement results are in good agreement. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
30. Design of Ultra-Wideband Antenna with Quadruple Band Notch Reconfigurability.
- Author
-
Sadineni, Ramesh Babu, Rao, Kosuri Srinivasa, Sushma, Thotakura, Kanth, Paruchuri Venkata Krishna, Rao, Veeravalli Ramakoteswara, and Gowda, Dinesha Puttaraje
- Subjects
ANTENNA design ,ULTRA-wideband antennas ,ANTENNAS (Electronics) ,PIN diodes ,WIRELESS LANs ,IEEE 802.16 (Standard) - Abstract
A miniaturized ultra-wideband (UWB) antenna with quadruple reconfigurable characteristics is proposed in this paper. The first step involves the development of an elementary rectangular patch antenna of size 40 × 40 mm2, which is subsequently modified to demonstrate UWB properties. To incorporate quad-band notch features, the radiating surface of the patch antenna is etched with four Ushaped slots. The antenna has an impedance bandwidth ranging from 2.2 GHz to 12 GHz, with four specific notches located at 3.3 GHz (3.1-3.5 GHz), 3.8 GHz (3.6 GHz-4 GHz), 4.6 GHz (4.5 GHz-4.7 GHz), and 5.2 GHz (5.1 GHz-5.3 GHz). By incorporating four PIN diodes, the antenna is capable of attaining a range of sixteen reconfigurable states across the UWB spectrum. The design of this system successfully addresses the issue of interference caused by WiMAX, downlink C-band, Indian national satellite system, and Wireless LAN. A prototype is fabricated and tested. The simulated and experimental results are in good agreement. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
31. Design of an enhanced dual-band microstrip patch antenna with defected ground structures for WLAN and WiMax.
- Author
-
El Issawi, Mohamed Lemine, Konditi, Dominic Bernard Onyango, and Usman, Aliyu Danjuma
- Subjects
IEEE 802.16 (Standard) ,WIRELESS LANs ,MICROSTRIP antennas ,BARIUM strontium titanate ,WIRELESS communications ,ANTENNA design ,FIREPROOFING agents ,ANTENNAS (Electronics) - Abstract
This research presents an innovative dual-band microstrip patch antenna design enhanced with defected ground structures (DGS) and barium strontium titanate (BST) thin film, tailored for wireless local area network (WLAN) and WiMax applications. The first design phase involved the development of an microstrip patch antenna (MPA) using an flame retardant (FR4) substrate with a permittivity (er1) of 4.3 and a thickness of 1.524 mm, enhanced with DGS. This configuration achieved a single-band resonance at 4.1 GHz, with a bandwidth of 0.82 GHz and a return loss (S11) of -32 dB. The second phase involved the integration of a BST thin film, with a high permittivity(er2) of 250 and a thickness of 0.1 mm, into the DGS-enhanced microstrip patch antenna (MPA). This modification led to a transformation in the antenna's performance, enabling dual-band operation at resonance frequencies of 2.8 GHz and 5.8 GHz. Further, there was a corresponding substantial increase in bandwidth to 1.34 GHz and 1.25 GHz, respectively, an improvement in S11 values to -16.3 dB and -21.4 dB. Moreover, and antenna's size of 14×10×1.524 mm³. The study underscores the critical role of innovative material use and design optimization in advancing antenna technology, offering significant enhancements in bandwidth, and miniaturization, for wireless communication systems. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
32. Design of Cherry Blossom Flower – Shaped fractal antenna for wearable application.
- Author
-
Chitra, R. Jothi, Sivarathinabala, M., Gowtham, N., Kumar, R. K. Naveen, and Gandhi, P. Selva
- Subjects
- *
WEARABLE antennas , *WIRELESS LANs , *ANTENNAS (Electronics) , *MICROSTRIP transmission lines , *PERMITTIVITY , *SIMULATION software - Abstract
A compact Cherry Blossom Flower-shaped fractal antenna has been designed for Wearable application. The antenna is 52mm ×54mm ×1.9 mm in size. It comprises a, two iterative eight petal shaped radiator and simulated on Polyethylene substrate with a thickness of 1.9 mm and a dielectric constant of ℇr=2.25 is used. The petal shaped fractal has been incorporated into the patch to improve the radiation properties of the designed antenna. The 50Ω microstrip feed line powers the flower shaped fractal antenna and simulated using Ansoft HFSS simulation software. The presented antenna is operated at 2.45 GHz with a return loss value of -12.45dB and VSWR of 1.51. A peak gain of 6.6 dBi is achieved at second iteration at 2.45GHz. Radiation properties such as return loss, gain, VSWR and radiation pattern are simulated and demonstrated. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
33. Reduced-size wideband rectangular patch antenna for IoT application.
- Author
-
Fernandez, Rudy, Thaher, Muhammad Abrar, Nofendra, Riko, and Firdaus
- Subjects
- *
MICROSTRIP antennas , *ANTENNAS (Electronics) , *WIRELESS LANs , *ANTENNA design , *INTERNET of things , *BANDWIDTHS - Abstract
This study proposes a rectangular microstrip patch antenna design using a shorting pin to get bandwidth enhancement and size reduced. Shorting pin is used in the patch and located next to the position of the coaxial feed point. The design is simulated using an EM Simulator. The final design of the antenna has a dimension of 40.5 mm x 32.1 mm (reduced by 26.62%). The simulation result shows the antenna has a minimum return loss of -16.9206 dB with a bandwidth of 146.1 MHz. The use of shorting pin increases the bandwidth by 123%. The gain of the antenna is 3.4733 dBi with a directional radiation pattern. The proposed antenna is suitable for operating in the LTE band 40 to support IoT applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
34. Bended rectangular patch antenna design for wearable applications.
- Author
-
Kumar, Ch. Narendra, Alekhya, B., Bharg, A. S. T. Aditya, Krishna, P. Vamsi, and Ajitha, B. V. S.
- Subjects
- *
ANTENNA design , *WEARABLE antennas , *ANTENNAS (Electronics) , *MICROSTRIP antennas , *WIRELESS LANs , *PERMITTIVITY , *EPOXY resins - Abstract
In the past years, antennas have played crucial roles in the field of wireless devices for wearable applications. For designing the antenna according to its wearable applications, it needed to be bent. In this design, we used two different substrates for bending rectangular patch antennas, i.e., FR-4 epoxy and Teflon. By comparing the results obtained by both substrates, we prefer the effective one. An antenna with a Teflon substrate having dielectric constant 2.2 is considerable for the parametric analysis after the comparison with FR-4 epoxy for which, the dielectric constant is 4.4. The systematic study of the radiation pattern along with parametric analysis of the Teflon substrate of patch antenna for different bending angles has been carried out at operating frequency of 2.5 GHz. The design and simulation of the antenna that is bent on the E-plane is done using HFSS software. The final comparison of both the antennas makes designing of a bended antenna ease for antenna designers. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
35. Design and minimization of return loss and bandwidth of the novel wideband rectangular antenna in comparison with circular patch antenna.
- Author
-
Bhargav, K. and Priyanka, R.
- Subjects
- *
MICROSTRIP antennas , *ANTENNAS (Electronics) , *COMPUTER engineering , *ANTENNA design , *BANDWIDTHS , *WIRELESS LANs , *COMPUTER software - Abstract
The aim of the study is to design a novel wideband rectangular microstrip patch antenna in comparison with circular patch antenna and analysis of return Loss and bandwidth of the novel wideband rectangular antenna using Computer Simulation Technology (CST). The total of 40 samples were used for the analysis of group 1 and group 2. Rectangular patch antenna is considered as group 1 and circular patch antenna is considered as group 2. The rectangular and circular patch antenna analyzed with the g power of 80%. Novel wideband rectangular patch antenna achieved the return loss of -34 dB, and bandwidth of 5.5 GHz in comparison with circular patch antenna achieved bandwidth of 5.3 GHz, return loss of -15.99 dB. The significance achieved by this analysis is p<0.05. The novel wideband rectangular patch-antenna achieved significantly better return loss, bandwidth, VSWR than the circular patch antenna designed and simulated using software simulated with computer technology. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
36. Bandwidth improvement of T-shaped slotted multiple input and multiple output antenna comparing with double slotted antenna using high frequency structure simulator software.
- Author
-
Naidu, Modepalli Brahma and Kalyanasundaram, P.
- Subjects
- *
SLOT antennas , *HIGH frequency antennas , *ANTENNAS (Electronics) , *WIRELESS LANs , *BANDWIDTHS , *ANTENNA design - Abstract
The focus of this study is on developing a new kind of Multiple Input Multiple Output (MIMO) antenna with a slotted rectangular T-shape on a FR4 epoxy substrate, with the goal of increasing bandwidth in the 6–10 GHz range. From 6 GHz to 10 GHz, the bandwidth and frequency of a T-shaped slotted Multiple Input Multiple Output (MIMO) antenna (Group1, n=15) were compared to those of a Single slot MIMO (Group2, n=15) antenna. Maximum allowable error is set at 0.02 percent, and the pre-test power for testing T-shaped Slot and Double slotted antennas is 80 percent. In the region of 6 GHz to 10 GHz, we compared the bandwidth and frequency of a Double slotted MIMO Antenna to that of a T-shaped slot MIMO antenna. Compared to the double-slotted antenna's 10 MHz bandwidth, the T-shaped slot MIMO antenna's bandwidth is 100 MHz. Maximum bandwidth was achieved at a frequency of 5.9 GHz with both the T-shaped slot MIMO antenna and the double slot MIMO antenna operating at 10 GHz. In this study, a p-value of 0.991 was reported, which is statistically significant (p>0.05). The T-shaped slot Multiple Input and Multiple Output Antenna improves bandwidth in the 10 GHz region for Ultra-Wideband applications within the constraints of this innovative antenna design. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
37. Elk Antennas 2M/440L5 Dual-Band Portable Log-Periodic Antenna.
- Author
-
Leonardelli, John
- Subjects
ANTENNAS (Electronics) ,MULTIFREQUENCY antennas ,WIRELESS LANs ,TELECOMMUNICATION satellites ,ELK ,SPARE parts ,MOBILE antennas - Abstract
The article evaluates Elk Antennas 2M/440L5 Dual-Band Portable Log-Periodic Antenna.
- Published
- 2024
38. Compact Power Without Compromise: Dell Precision 3280 Compact Workstation: Dell's latest ultra-small form factor workstation makes no compromises.
- Author
-
COHN, DAVID
- Subjects
LOCAL area networks ,DELL computers ,WIRELESS LANs - Abstract
The article focuses on Dell's introduction of the Precision 3280 compact workstation, which supports the latest Intel Core processors and Tensor Core GPUs. Topics include the workstation's ultra-small form factor and design, its performance capabilities despite its size, and its suitability for environments with limited desk space.
- Published
- 2024
39. Triple notched MIMO antenna for S and C band applications.
- Author
-
Gupta, Sumit Kumar, Mark, Robert, and Das, Soma
- Subjects
- *
ANTENNAS (Electronics) , *WIRELESS LANs , *IEEE 802.16 (Standard) , *REFLECTANCE , *STATISTICAL correlation - Abstract
A hexagon-shaped fractal multiple-input multiple-output (MIMO) antenna for WLAN, WiMax, and C band applications is proposed. The antenna consists of two hexagon-shaped self-similar fractal structures placed at a 6 mm gap with a reduced ground plane along with a ground stub at the centre. The proposed design covers the 2.37–7.82 GHz band with band rejections at 2.54–2.87 GHz, 3.56–3.83 GHz and 6.26–7.13 GHz. The notches are introduced to avoid interference between different application bands. The parametrically optimised reduced height of the ground plane and the strategical placement of a stub at the centre of this ground plane provide notch bands and reduce the mutual coupling below −17 dB throughout the operating bands. The proposed antenna gain varies between 2–3 dBi in the operating bands. The diversity parameters like envelope correlation coefficient (ECC) and diversity gain, channel capacity loss (CCL) and Total Active Reflection Coefficient (TARC) are calculated and found to be well below the acceptable range. A prototype of the proposed design is fabricated and measured. The measurement results are in good agreement with their simulated counterparts. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
40. Broadband CP corner-truncated microstrip antenna with irregularly hexagonal AMC for 2.45 GHz applications.
- Author
-
Wichaidit, Purichaya, Dentri, Sitthichai, Janpangngern, Pisit, Lertwiriyaprapa, Titipong, Krairiksh, Monai, and Phongcharoenpanich, Chuwong
- Subjects
MICROSTRIP antennas ,WIRELESS LANs ,BROADBAND antennas ,UNIT cell ,IMPEDANCE matching ,CIRCULAR polarization ,TELECOMMUNICATION - Abstract
This research proposes a compact broadband circularly polarized (CP) corner-truncated microstrip antenna with irregularly hexagonal artificial magnetic conductor (AMC) for 2.45 GHz WLAN applications. The corners of the radiating patch are diagonally truncated to realize circular polarization and improve axial ratio. A 5▪5 irregularly hexagonal AMC array is employed to enhance the axial ratio bandwidth (ARBW) and antenna gain. In addition, a tri-section meandering feedline is used to realize impedance matching and improve the impedance bandwidth (IBW). The AMC array is used to manipulate electromagnetic waves by suppressing surface currents and back lobe, resulting in reduced back radiation and enhanced front-to-back ratio. The simulated IBW and ARBW are 50.9% (1.86 – 3.13 GHz) and 19.3% (2.24 – 2.72 GHz) respectively, with a maximum gain of 8.9 dBic at 2.45 GHz. The measured IBW and ARBW are 42.42% (1.95 – 3.0 GHz) and 29.4% (2.03 – 2.73 GHz), with a maximum gain of 8.6 dBic. The simulated half power beamwidth (HPBW) of the proposed antenna scheme in the xz plane at 2.24 GHz, 2.45 GHz, and 2.72 GHz are 67°, 62°, and 51°, respectively. The corresponding HPBW in the yz plane are 60°, 55°, and 62°. The simulated AR beamwidth in the xz plane at 2.24 GHz, 2.45 GHz, and 2.72 GHz are 177°, 164°, and 88°, respectively. The corresponding AR beamwidth in the yz plane are 148°, 106°, and 124°. The simulated cross polarized (XP) levels at 2.45 GHz are below -19.35 dB for both planes. The measured HPBW in the xz plane at 2.24 GHz, 2.45 GHz, and 2.72 GHz are 69°, 64°, and 50°, respectively. The corresponding HPBW in the yz plane are 65°, 54°, and 37°. The measured AR beamwidth in the xz plane at 2.24 GHz, 2.45 GHz, and 2.72 GHz are 161°, 200°, and 104°, respectively. The corresponding AR beamwidth in the yz plane are 162°, 85°, and 90°. The measured XP levels at 2.45 GHz are below -15.62 dB for both planes. The radiation pattern is unidirectional. Essentially, the proposed broadband CP antenna scheme is suitable for the WLAN frequency band and other 2.45 GHz wireless communication technologies. The novelty of this research lies in the use of the tri-section meandering feedline and the irregularly hexagonal AMC array to enhance IBW and ARBW. • This research proposes a compact broadband CP corner-truncated microstrip antenna with irregularly hexagonal AMC for 2.45 GHz WLAN application. • The measured IBW and ARBW are 42.42% (1.95 – 3.0 GHz) and 29.4% (2.03 – 2.73 GHz), with a gain of 8.6 dBic. The radiation pattern is unidirectional. • The measured HPBW in the xz and yz plane at 2.45 GHz are 64° and 54°, respectively. The measured XP levels at 2.45 GHz are below -15.62 dB for both planes. • The proposed broadband CP antenna scheme is suitable for the WLAN frequency band and other 2.45 GHz wireless communication technologies. • The novelty of this research lies in trisection meandering feedline and the irregularly hexagonal AMC unit cells to achieve wider IBW and ARBW. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
41. Advanced Wireless Sensor Networks: Applications, Challenges and Research Trends.
- Author
-
Kandris, Dionisis and Anastasiadis, Eleftherios
- Subjects
WIRELESS sensor networks ,K-nearest neighbor classification ,WIRELESS LANs ,DEEP learning ,AD hoc computer networks ,ARTIFICIAL neural networks ,WIRELESS Internet - Abstract
This document serves as an introduction to a special issue on wireless sensor networks (WSNs), explaining their structure and applications in various sectors. It also discusses the challenges faced by WSNs, such as limited energy and data management. The special issue features ten research papers on advanced WSNs. [Extracted from the article]
- Published
- 2024
- Full Text
- View/download PDF
42. Scanning the Issue.
- Author
-
Mallik, Ranjan K, Koul, Shiban K, and Kumar, Arun
- Subjects
- *
POWER electronics , *CARBON nanotube field effect transistors , *MEDICAL electronics , *WIRELESS LANs , *CONVOLUTIONAL neural networks , *DEEP learning , *MULTICASTING (Computer networks) - Abstract
The latest edition of the IETE Journal of Research (Volume 70, Number 6, June 2024) features 45 articles covering a diverse range of topics including communications, electromagnetics, computers and computing, control engineering, electronic circuits, devices and components, instrumentation and measurement, medical electronics, and power electronics. The journal has also appointed three new Deputy Editors-in-Chief to the Editorial Board. The articles delve into various subjects such as wireless communication systems, PAPR reduction in OFDM systems, deep learning classifiers for 5G D2D communication, optimization techniques for IoT relay communication systems, rain attenuation prediction models, adaptive beamforming using convolutional neural networks, and antenna designs for different applications. Other papers explore topics such as geometry word problem resolution, XSS attack detection, video traffic reduction in 5G networks, breast cancer detection in MRI images, multimodal brain image fusion, melanoma skin disease detection, speech enhancement techniques, land cover change detection, medical image encryption, multimedia computation offloading in 5G networks, and priority-based scheduling in hybrid VANETs. These papers provide valuable insights and contribute to the existing body of knowledge in their respective fields. [Extracted from the article]
- Published
- 2024
- Full Text
- View/download PDF
43. Low-Cost L-Band to Ku-Band Frequency Reconfigurable BAR64-02V Controlled Antenna for Satellite, Military, and Radar Applications.
- Author
-
Varshney, Atul, Neebha, T. Mary, Sharma, Vipul, and Andrushia, A. Diana
- Subjects
- *
ANTENNAS (Electronics) , *PIN diodes , *ANTENNA design , *REFLECTANCE , *RESONATORS , *WIRELESS LANs , *MICROSTRIP antennas - Abstract
A miniaturized edge-fed multi-band wideband (WB) sensor complementary split ring resonator (CSRR) and two folded pedal arms loaded antenna for wireless, ISM, military, Radar, and satellite applications is fabricated, tested, and investigated. The reduced ground plane at the bottom to makes the gain positive and leads to improvement in the radiation efficiency. Loading of antenna patch with two folded bicycle pedal-shaped arms results in an increased total electrical length and hence antenna could be tuned up to higher frequency bands. The appended two folded pedal arms enhance the value of gain and CSRR loading introduces additional resonant frequencies below −10dB reflection coefficient. The symmetrical ground width compression results in total antenna size miniaturization to 43.33% concerning the conventional circular microstrip antenna designed at a frequency of 2.45GHz. The antenna has a bidirectional radiation pattern with a gain of 5.21dBi and a radiation efficiency of 90.50%. The antenna exhibits four bands (2.13–2.58GHz), (2.77–3.89GHz), (5.65–6.56GHz), and (7.77–12.98GHz) within a frequency sweep of 1–15GHz, therefore it, is the most suitable element for Bluetooth, PCS, ISM band, 3G/4G/5G, Wi-MAX/WLAN/ Wi-Fi, and wireless, satellite, military, and RADAR applications. These bands are frequency reconfigured by two BAP64-02V PIN diodes in the pedal-arms fold locations with four switching combinations. The measured (frequency sweep: 1–23GHz) and simulated antenna reflection coefficient values are found in match except for a frequency range of 12–14 GHz. The antenna was fabricated on a low-cost FR-4 that holds well <12 GHz frequencies, and >12 GHz frequencies values this shows nonlinear and frequency dispersion. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
44. Contention-Less Multi-Link Synchronous Transmission for Throughput Enhancement and Heterogeneous Fairness in Wi-Fi 7.
- Author
-
Kwon, Lam and Park, Eun-Chan
- Subjects
- *
WIRELESS LANs , *WIRELESS Internet , *FAIRNESS - Abstract
Multi-link operation (MLO) is a new and essential mechanism of IEEE 802.11be Extremely High Throughput (Wi-Fi 7) that can increase throughput and decrease latency in Wireless Local Area Networks (WLANs). The MLO enables a Multi-Link Device (MLD) to perform Simultaneous Transmission and Reception (STR) in different frequency bands. However, not all MLDs can support STR due to cross-link or in-device coexistence interference, while an STR-unable MLD (NSTR-MLD) can transmit multiple frames simultaneously in more than two links. This study focuses on the problems when NSTR-MLDs share a link with Single-Link Devices (SLDs). We propose a Contention-Less Synchronous Transmission (CLST) mechanism to improve fairness between NSTR-MLDs and SLDs while increasing the total network throughput. The proposed mechanism classifies links as MLD Dominant Links (MDLs) and Heterogeneous Coexistence Links (HCLs). In the proposed mechanism, an NSTR-MLD obtains a Synchronous Transmission Token (STT) through a virtual channel contention in the HCL but does not actually transmit a frame in the HCL, which is compensated for by a synchronous transmission triggered in the MDL. Moreover, the CLST mechanism allows additional subsequent transmissions up to the accumulated STT without further contention. Extensive simulation results confirm the outstanding performance of the CLST mechanism in terms of total throughput and fairness compared to existing synchronous transmission mechanisms. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
45. Wi‐Fi 6‐based home area network for demand response in smart grid.
- Author
-
Edirisinghe, Sampath, Wijethunge, Akila, and Ranaweera, Chathurika
- Subjects
- *
SMART power grids , *HOME computer networks , *WIRELESS LANs , *CARRIER transmission on electric lines , *WIRELESS Internet , *LOAD management (Electric power) , *DIGITAL twins - Abstract
Summary: The past decade has brought prolific developments to power systems that range from large‐scale renewable integration to digital twins. Modern power systems consist of highly variable generation clusters. Hence, monitoring and prediction of power generation has become a vital part of today's power systems. On the other hand, detailed real‐time information of power usage is also a key parameter for the control algorithms used for the demand side management. With this information flow, power systems become smart grids which offer improved service and enable many advanced operations. In this regard, the home area network (HAN), which collects the power consumption/generation of household devices, plays a key role. So far, a number of technologies such as ZigBee, Z‐Wave, and Power Line Communication (PLC) have been considered for the HAN. Yet, widely used wireless local area network (WLAN) technology, Wi‐Fi, was not identified as a prominent candidate due to the limitations in its latency and reliability. However, with the introduction of the IEEE 802.11ax standard, Wi‐Fi 6 was developed, and it demonstrates guaranteed latency and reliability for its users. Thus, with its widespread deployment in households, Wi‐Fi is becoming a natural candidate for HAN. In this article, we present a comprehensive HAN protocol based on Wi‐Fi 6 which can achieve guaranteed latency and reliability for HAN users. The results show that when an efficient resource allocation mechanism is in place, using Wi‐Fi for HAN does not adversely affect the other Wi‐Fi users in the normal WLAN. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
46. A high gain and compact size asymmetrical 17‐level inverter for medium‐ and high‐power applications.
- Author
-
Ahmad, Mohd Faraz, Arif, M. Saad Bin, Abdelrahem, Mohamed, and Rodriguez, Jose
- Subjects
- *
PHOTOVOLTAIC power systems , *VOLTAGE control , *SOLAR system , *VOLTAGE , *WIRELESS LANs - Abstract
Summary: A new structure of an asymmetrical switched‐capacitor‐based multilevel inverter topology is proposed. The circuit is capable of generating 17‐level boosted output utilizing 11 switches and two DC sources in the ratio of 1:2, having a voltage gain of 2.6 times the input voltage. The boosting capacitors were properly charge‐discharged during one complete cycle without requiring any complex control circuit for voltage balancing. The simulation model of the proposed circuit is developed in MATLAB, and the performance of the circuit is experimentally validated. The thermal modeling using PLECS software for power loss evolution is performed, and the maximum efficiency of 97.70% is achieved by implanting a low switching frequency scheme. The comparison with the other similar topologies shows the proposed topology is better than the other compared topologies in many parameters. The boosted output voltage utilizing reduced components makes the proposed topology feasible for various applications, including solar PV system. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
47. A circular compact ultra‐wideband antenna for 5G microwave applications.
- Author
-
Yadav, Swati Varun, Yadav, Manish Varun, Ali, Tanweer, Kumar Dash, Sounik Kiran, Hegde, Navya Thirumaleshwar, and Nair, Vishnu G.
- Subjects
- *
ULTRA-wideband antennas , *IEEE 802.16 (Standard) , *WIRELESS LANs , *MICROWAVE antennas , *MICROWAVE communication systems , *ANTENNAS (Electronics) , *WIRELESS Internet - Abstract
This article introduces an innovative circular and compact ultra‐wideband (UWB) radiator designed specifically for 5G microwave applications. This antenna incorporates a “TU”-shaped ground plane on its reverse side, with strip lines feeding the circular element on the front side. Notably, the antenna exhibits impressive characteristics, including an outstanding impedance bandwidth of 107%, and an impressive return loss of -32 dB. Its operational frequency range spans from 2.4 GHz to 11 GHz, centered at 6.7 GHz. Extensive simulations were conducted using CST microwave studio software to validate its performance. The antenna’s physical dimensions are defined by a size of 0.12 λ × 0.08 λ × 0.012 λ relative to its wavelength. Furthermore, this antenna demonstrates exceptional stability in its polar patterns and maintains a high-efficiency level, achieving a substantial gain of 3.75 dBi with an efficiency rating of 84.5%. These remarkable attributes make this antenna suitable for a wide range of applications, including Wi-Fi, 5G, WLAN, and various other microwave communication scenarios. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
48. A compact smiley shaped flexible patch antenna for ISM band applications.
- Author
-
Julius Fusic, S., Sugumari, T., Giri, Jayant, Sitharthan, R., Badawy, Ahmed Said, Ahmad, Naim, and Sathish, T.
- Subjects
- *
MAGNETIC resonance mammography , *ANTENNAS (Electronics) , *WIRELESS LANs , *WEARABLE antennas , *MICROSTRIP antennas , *BREAST ultrasound - Abstract
Breast cancer is a medical condition characterized by the uncontrolled proliferation of cells in the breast tissue. Breast cancer can originate from various parts of the breast, and methods such as Breast ultrasound, Diagnostic mammogram, Breast magnetic resonance imaging, and Biopsy are currently used for its diagnosis. However, these methods have certain limitations, and their size can be a hindrance. To overcome this, low-power, flexible antennas can be designed for bio-communication between medical equipment and external instrumentation. Flexible and wearable antennas have advantages such as affordability, ease of fabrication, and high gain. In this article, a microstrip patch antenna operating at 2.45 GHz and made of polyamide material is designed using High Frequency Structure Simulator software. The simulation results show the patch antenna has a gain of 1, −14.81 dB return loss at 2.45 GHz based on |S11| ≤ −10 dB. The directive radiation pattern with axial ratio of 63.39 dB and voltage standing wave ratio ≤ 3. Furthermore, the hardware development of proposed antenna with polyamide substrate provides the resonance frequency nearing to simulation results as 2.318 GHz with return loss of −28.19 dB. Based on mathematical analysis, simulation and hardware results, the proposed antenna is a superior option for breast cancer detection. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
49. Low sidelobe planar electrically large sparse array antenna with element number reduction based on genetic algorithm.
- Author
-
Zhu, Yangkun, Ma, Wenyu, Wang, Chuang, and Cao, Wenquan
- Subjects
- *
ANTENNA arrays , *SLOT antennas , *WIRELESS LANs , *ANTENNAS (Electronics) , *ANTENNA design , *ANTENNA radiation patterns , *PLANAR graphs - Abstract
Conventionally, both electrically larger (EL) arrays and sparse arrays offer the advantage of element number reduction but disadvantage of high sidelobe levels. A new scheme of planar EL sparse array antenna based on a genetic algorithm (GA) to achieve low sidelobe with element number reduction is proposed. To begin with, EL sparse array antenna optimisation models based on GA for both linear and planar arrays are analysed. Then, an EL slot antenna element based on a 3 × 3 substrate integrated waveguide cavity is designed. An 8‐element linear EL sparse array antenna is designed and compared with a uniform array antenna, demonstrating a reduction in the maximum sidelobe level (MSLL) by nearly 4.6 dB. After that, a 4 × 8 element planar EL sparse array antenna is fabricated and measured. Compared to an 8 × 16 element planar EL uniform array antenna, the number of antenna elements is reduced by 75%, while the MSLL is reduced by approximately 3 dB. The measured −10 dB impedance bandwidth ranges from 25.3 to 27.8 GHz. At the central frequency, the radiation pattern achieves a peak gain of 29.6 dBi, exhibiting low sidelobe levels below −15.0 dB. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
50. Pretty small low-cost bandpass filter using a single square open-loop resonator with a centered stub for WLAN/Bluetooth/ZigBee/RFID and ISM band applications.
- Author
-
El Ouadi, Zakaria, Amadid, Jamal, Khabba, Asma, El Yassini, Abdessalam, Ibnyaich, Saida, and Zeroual, Abdelouhab
- Subjects
- *
BANDPASS filters , *WIRELESS LANs , *ZIGBEE , *MICROWAVE filters , *WIRELESS communications , *INSERTION loss (Telecommunication) , *REFLECTANCE - Abstract
In recent years, microwave filtering technologies have known great advancement and wide employment in wireless communication systems, necessitating the development of miniaturization techniques to respect the size limitation in wireless communication devices and reduce the cost, in order to satisfy the consumer and be more competitive. Accordingly, the design of a microwave filter is chosen based on its electrical performance, size, and manufacturing price. Therefore, it is necessary to make a good compromise between the mentioned criteria to satisfy the industrial requirements. This paper proposes a small and inexpensive bandpass filter (BPF), where the proposed structure is carefully constructed over a low-price FR4 Epoxy substrate with a full dimension of (17.6 × 9 × 1.6) mm3. The proposed filter offers good electrical performance in terms of reflection coefficient (S11), insertion loss (S21), Voltage Standing Wave Ratio (VSWR), and selectivity. A filter prototype is fabricated and tested to affirm the simulation results. Consequently, the measured results show a good agreement with the simulation, proving the suitability of the proposed filter for different wireless applications, including WLAN, Bluetooth, ZigBee, RFID, and ISM bands. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.