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This paper proposes a wide band and multiband frequency reconfigurable antenna that can operate in the UWB, GSM, GPS, 4G LTE, WLAN, and WiMAX bands. The antenna is made up of a trapezoidal-shaped monopole radiator, which was inspired by a rectangular monopole antenna. The ground plane is modified by embedding T and L-shaped slots to notch the desired operating frequency. The proposed antenna can switch to six different frequencies using RF PIN diodes, making it suitable for modern wireless applications. A multilayer frequency selective surface (FSS) reflector is presented to improve the gain of the proposed reconfigurable antenna. The low-profile design achieved a significant increase in gain while retaining the UWB antenna's excellent impedance bandwidth. Because of the use of the FSS reflector, the antenna's average peak gain has increased from 6 to 10.4 dBi. The proposed antenna has a wide switching capability, which validates its unique feasibility for high-speed multiple Internet of Things applications via a common embedded platform under various applications.

In this paper, a novel ultra-wide-band antenna backed by a suspended ground for an enhancement of bandwidth and a frequency selective surface (FSS) reflector for the enhancement of gain is proposed in order to meet the specific coverage requirements for broadband applications. The impedance bandwidth of the proposed antenna is 13.4 GHz (1.8–15.2 GHz). To enhance the gain of the antenna, a FSS reflector is employed below the suggested ultra wide-band antenna. A novel FSS, which consists of 5 × 5 array of elements, located at a distance of 1.01 λ (36.14 mm) below the proposed antenna. There is 4–5 dBi improvement in antenna gain after application of the FSS. In order to observe the signal correlation of the proposed antenna, the time domain analysis using similar antennas in face-to-face and side-to-side scenarios has been performed using the EM simulation tool CST-STUDIO. The simulated results of the proposed antenna exhibit good agreement with the experimental results of the prototype model antenna.

In this work, a design study of octagonal shape FSS (Frequency Selective Surface) based type A-sandwich radome wall is proposed for broadband airborne application. The type A-sandwich structure comprises composite materials of low density core layer sandwiched between two high density dielectric skin layers. Further to enhance the EM performance analysis over complete frequency band of 6.3 GHz – 11.9 GHz, the FSS structure is embedded in the core layer of type A-sandwich dielectric wall. The analysis of radome wall EM performance parameters are computed depend on TLM (equivalent transmission line method). A comparative analysis of EM performance is carried at normal as well as higher incident angles of 10°, 20° and 30° for both TE and TM polarization. The analysis shows the characteristics of FSS based type A-sandwich radome wall are superior as compared to conventional A-sandwich radome wall configuration. The designing and simulation approach involves a high frequency electromagnetic simulation tool.

This paper presents the design and simulation aspects of tri-band stacked patch antenna for GPS and IRNSS applications. The antenna has two microstrip circular patch layers, which has different diameter to achieve the tri-bands frequency characteristics. The conducting body of antenna has two dominant resonant modes from patch 1 and patch 2 for L5 and L1 applications and one higher-order resonant mode for S-band application. The subtract is used Rogers RO4003C for antenna with dielectric constant 3.55 and loss tangent 0.0027. Coaxial probe feed location is selected such a way to excite two dominant modes and one higher-order mode. The ground segment stations use tri-band, i.e. L5-band from 1164.45 to 1188.45 MHz and S-band from 2483.50 to 2500.00 MHz for IRNSS application and L1-band from 1563.42 to 1587.42 MHz for GPS application. The proposed tri-band patch antenna is designed for these ground stations for both the IRNSS and GPS systems. Simulated results of proposed antenna show desirable performance such as a small size of 80 × 80 × 4.73 mm3 and 10-dB return loss bandwidths (1.1525–1.1947 MHz, 1.5573–1.5980 MHz and 2.449–2.507 MHz) are 42.2 MHz, 40.7 MHz and 66.5 MHz, respectively, and desirable radiation patterns with gain of 3.81 dB at 1.175 MHz, 5.44 dB at 1.575 MHz and 2.44 dB at 2.507 MHz. The proposed antenna is designed and simulated by the help of EM simulation CST Studio Suite.

In this research paper, a circularly polarized IRNSS (Indian Regional Navigation Satellite System) receiver antenna is presented using the characteristic mode analysis (CMA) technique. The proposed antenna has been designed for S-band application (2483.50- 2500.00 MHz) with 16.5 MHz bandwidth for IRNSS receiver application. CMA technique has been used to determine the optimum feed location on antenna to obtain circular polarization (CP) for excitation of two orthogonal modes (TM10 and TM01) with equal in amplitude and 90o out of phase. The proposed antenna uses probe feed configuration and design using dielectric laminates FR4 (dielectric constant is 4.3 and loss tangent is 0.025). The axial ratio bandwidth (< 3 dB) of the proposed antenna is obtained from (2431.4 to 2562 MHz). The aim of this antenna to improve the technology of designing of antenna so as small in size miniaturization, less complex, better-improved parameters, rejection and easy to designing and integration with circuits.

In the proposed research work, antennas with circular polarization has been designed with the help of IE3D electromagnetic simulator. Four different geometry has been chosen for this. In that, 2 similar slots have been etched diagonally on the square microstrip patch. Four slots like square, circular, ring and cross-shaped was selected in order to create and prove circular polarization behavior. Axial ratio (A.R.) performance plot reflects the required circular polarization characteristics. Antennas performance was characterized with respect to reflection coefficient, impedance plot and three dimensional patterns. One of the antennas was fabricated in the laboratory and experimentally measured in order to validate the procedure.

This research paper presents the design of microstrip patch antenna through the simulation done by MATLAB source codes, which were developed using method of moment. In order to design, a simplest geometry of the patch antenna is chosen. Antennas of different length, width and feed locations are simulated. Antennas have been analyzed with various performance parameters such as impedance, radiation pattern, reflection coefficient, directivity and VSWR obtained. In order to validate the design approach, MATLAB simulation results for four antennas have been compared with the results obtained from electromagnetic CST simulator. Also one of the antennas has been fabricated in the laboratory and experimentally measured.