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A novel designed compact SRR slotted ultra-wideband antenna showing dual band-notched characteristics is designed and simulated. The antenna consists of an inverted rectangular split ring resonator slot on the radiation patch and inverted U-shaped slot etched on the 50 Ω microstrip line. By etching two slots on the radiation patch and microstrip fed line, two band notches are achieved in the WLAN band and X-band. The proposed antenna is a simple compact size of 21 × 30 mm2 and operates from 3.89 to 11.58 GHz.

A tri-band rectangular patch having C shaped slot with a strip with partial ground plane is proposed. The antenna is fed through 50 ohm inset feed. The antenna occupies the size 38mm x 49mm. Triple band is achieved due to the strip slot attached with C slot and Partial Ground Structure (PGS). The antenna covers the 2GHz, 3.6GHz and 7.2GHz bands with impedance bandwidth 390MHz, 430MHz and 360MHz respectively. The simulated and measured results show good antenna performance for multiple applications in wireless communication.

A CPW fed design for Monopole Microstrip Antenna (MMSA) for multiband wireless application is proposed. Antenna structure is gap coupled resonator with CPW feed. Two higher resonant frequencies of proposed antenna are related to E- shaped patch and one resonant frequency is observed with little effect on the width of the monopole. Design of antenna operating at 2.34, 4.3 and 6.5 GHz with wide Impedance bandwidth of 348 MHz (2.17-2.55 GHz), 1821 MHz (3.65.45 GHz) and 1968 MHz (5.62-7.5 GHz) is simulated and prototype is fabricated on RO (e r = 2.2 and substrate height=1.57mm) low profile of 0.31λ, where λ is wavelength of the lowest resonant frequency 2.34 GHz at free space. Compact antenna is (40 mm X 40 mm) 0.31λX0.31λ. It may utilized in Bluetooth, Wireless Local Area Network for IEEE.802.11a (5.15-5.825 GHz), Wi-Max band and C-band (4-8 GHz) wireless applications.

In the proposed paper, a spiral-shaped multiband antenna has been designed for various wireless applications. Antenna can efficiently support four different frequencies as 2.5, 3.8, 4.8, and 6.3 GHz coming under the band of different wireless applications such as GSM, Bluetooth, Wi-Fi, WLAN, WiMAX, and some defense applications. To obtain the multiple bands, multiple spiral-shaped slots are provided with the rectangular patch. Design results of VSWR, surface current, and return loss S11 are shown in this paper. This design is simulated using CST Software.

In this paper, a novel frequency reconfigurable microstrip patch antenna has been designed for three applications. This switchable band characteristic was achieved by introducing two diodes between the rectangular split ring patch and T-shaped patch. It makes the antenna reconfigurable in two operating modes: when both diodes D1 and D2 were ON, then antenna notched at dual frequencies and in second mode when both D1 and D2 diodes were OFF then antenna notched at triple frequencies. FR4 Epoxy substrate having dielectric constant 4.4 and tangent loss 0.025 has been used. For the antenna simulation CST MW studio software has been used.

A compact Design of Multi-Band Antenna With Cut Slots and Parasitic Patch for super high frequencies (SHF) in C band, S band and X band applications is proposed. The proposed antenna fabricated on a FR-4 substrate with dimensions 44.450 mm (L) × 55.60 mm (W) × 1.6 mm (h), relative permittivity e r =4.3 and loss tangent δ = 0.025. The proposed antenna is designed by etching rectangular cut at center and faces of patch with inset feed. CST microwave studio suite software used to simulate and measurement of fabricated design is done on VNA. The proposed multiband antenna can be used for Satellite Communications, ITU band, WLAN, IEEE 802.11a system, Aeronautical Radio navigation and Maritime applications.

A multiband antenna with a microstrip feed line and square shape slots with defected ground structure is presented in this paper. Application of this antenna is also presented in this paper. This antenna is designed on FR4 substrate and feed by a 50Ω modified microstrip line. This designed antenna has overall size of 50 × 50 mm. Antenna is symmetrical about both the axis. A multiband antenna is operates on multiple frequency so this antenna covers three different frequencies as 2.3 GHz, 5.3 GHz and 6.7 GHz. All of these frequencies are applicable for GSM, Bluetooth, WiFi, WiMAX, and some other broadband applications. Return loss (Sii), VSWR, Surface current, Radiation pattern are simulated and observed on CST simulation software.

With the aggrandize in the usage of wireless communication, interference has also been elevated. This paper presents a frequency-selective surface (FSS)-based band-stop filter, which leads to minimize the interference hence the impedance bandwidth, gain, and angular stability of antenna has been augmented tremendously. The incorporated design has a square-shaped patch of dimension 21.25 mm × 21.25 mm with two loop elements and a hexagonal slot embedded within it. The proposed multi-band structure is realized in CST microwave studio for three stop bands such as 2.24–2.70 GHz (Wi-Max), 3.41–3.61 GHz (Wi-Max), and 5.05–6.01 GHz (WLAN). Insertion loss at the three resonating frequencies 2.51, 3.51, and 5.47 GHz are −45.80, −40.02, and −52.67 dB, respectively. This paper incorporates different sections including the design of unit cell and finite array, simulation results of the structure, and conclusion.

In this paper, a monopole UWB antenna is presented which has reconfigurable multiband notch characteristics. Antenna design is based on split ring resonators, which are introduced on patch side and a complementary rhombic split ring resonator is implemented as a slot on patch. SRR and CSRR are used for notching the different frequency bands. Two pin diodes are mounted on the SRR. Different states of the switches serve different notches in the frequency band, thus leading to band notch reconfigurability. VSWR and gain are analyzed for different modes of operations. CST microwave studio is used to design and simulate the antenna.

This paper proposed a compact planar ultra wideband (UWB) antenna with single band-notched behavior. An inverted pie-shaped slot is etched in a circular patch for getting the notch behavior. The presented antenna is successfully designed, simulated and measured showing single notch nature in UWB band as this band interfere in it. This antenna is designed on FR-4 substrate with dielectric constant 4.4 and thickness of 1.6 mm. The antenna parameters such as return loss, VSWR, gain and directivity are simulated and optimized using commercial computer simulation technology microwave studio (CST MWS). The designed antenna is showing band notch property at 7 GHz (6.4–7.5 GHz for satellite communication) as this band interfere with the UWB. The main advantage of this antenna is that the designed structure is very simple and the cost for making this antenna is also low.

In this paper we have proposed a circular patch antenna for ultra wide band applications. It incorporate three layers namely ground, substrate and patch in which patch is embedded on the FR-4 substrate whose permittivity is 4.4 and thickness is 1.6 mm. The antenna structure has tremendous band response from the operating frequency range is 3.1–10.7 GHz with 3.9 GHz resonating frequency. The return loss at each frequency is S11 < −20 dB. The various antenna parameters like VSWR, Return loss, and Radiation patterns of designed antenna are presented in this paper.

A monopole wideband antenna is demonstrated in this paper. The proposed antenna has wideband characteristics which work on three different bands can be used for WiMAX, WLAN, Bluetooth and 802.11y enabled devices. Additional resonances are excited by embedding two L-shaped notches in the ground plane. The return loss at each frequency is S11 < −20 dB. The various antenna parameters like Return loss, VSWR and Radiation patterns of proposed antenna are presented in the paper.

In this paper, Koch curve fractal antenna is proposed for wireless applications. The antenna has been designed by increasing the perimeters of triangular shape patch by using self-similarity property. Number of iterations by the designing Koch snowflake for different resonant frequency, are given. The proposed antenna is designed to operate at Wi-MAX frequency from 3.4 GHz -3.69 GHz and C-Band applications in 2.8 GHz-6.4 GHz frequency range. The proposed antenna is fed by a 50-Ω microstrip line and fabricated on a low-cost FR4 substrate having dimensions 33.5(L) × 28.5(W) × 1.6(h) mm 3 with □ r =4.4 and tanδ= 0.025. The antenna shows acceptable gain with nearly omni-directional radiation patterns in the frequency band for wireless applications.

In this paper a combination of triangular and circular shape microstrip antenna design is proposed. The proposed design of antenna will work in wireless application and provide contribution in the field of ultra wide band application. The proposed design is fabricated on low cost FR-4 epoxy substrate with relative permittivity 4.4 and having dimension 17.89H 21.45H 1.6�i�i ‹ .This proposed antenna design operates over the frequency range 4.12 GHz-6.8 GHz. For the proposed design return loss -33.74dB has achieved at resonant frequency 5.6 GHz. Also VSWR

An ultra-wideband printed monopole antenna with dual band-notched characteristics is presented. The antenna consists of a split ring resonator (SRR) on the circular patch and defected ground structure (DGS) and symmetrical-slits in the coplanar ground plane. It is designed for avoiding interference with Worldwide Interoperability for Microwave Access (Wi-Max) (3.4 – 3.69GHz) and Wireless Local Area Networks (WLAN) (5.15 – 5.825GHz). Predicted impedance bandwidth of antenna is 2.70 – 10.67GHz, for VSWR < 2. Incorporation of DGS and SRR results in dual band-notched bandwidth from 3.30GHz – 3.86GHz and 5.28 – 5.89GHz respectively. The gain of antenna varies 2.48 dBi to 4.72 dBi over the operating bandwidth. In the band notched regions, the gain reduces from its normal value to about 7.94 dBi at 3.64GHz while it reduces by 4.27 dBi at 5.67GHz.