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A novel design of a P‐shape microstrip antenna is proposed. The stub in the P‐shape patch modifies the frequency and resonant mode distributions at second‐order TM20 mode which along with TM10 and TM01 modes yields dual‐polarised triple‐frequency response, showing 1−1.5% of impedance bandwidth (BW) at each frequency. To enhance the gain, air‐suspended designs for the P‐shape patch are proposed. It yields the broadside gain of 1.5−5 dBi across three frequencies. Enhancement in BW of the P‐shape patch is obtained by using its gap‐coupled variations leading to 69‐ or 96‐shape configurations. On a thinner substrate, these gap‐coupled antennas give BW of 3−5% across three frequencies. [ABSTRACT FROM AUTHOR]

Abstract Wideband design of E-shape microstrip antenna is discussed, which yields bandwidth of 213 MHz (19.42%) on the substrate of thickness 0.06λ 0. Further enhancement in E-shape antenna bandwidth is obtained by embedding pairs of rectangular slots on the ground plane. A detailed study explaining the effect of slots on the resonant modes of the patch and modified ground plane, in yielding wideband response, is presented. The E-shape patch backed by single pair of slots cut ground plane yields BW of 233 MHz (21.4%) whereas that with two pairs of slots on the ground plane, bandwidth of 318 MHz (28.12%) is obtained, which is nearly 10% more as compared to the bandwidth obtained from E-shape patch. The antenna with two pairs of slots on the ground plane yields broadside radiation pattern across the complete bandwidth with peak broadside gain of more than 7 dBi. [ABSTRACT FROM AUTHOR]

Abstract Wide band designs of E-shape and U-slot cut Rectangular Microstrip antennas are discussed which yields bandwidth of 207 (23%%) and 174 (19%) MHz, respectively. For further bandwidth enhancement, various designs of E-shape and U-slot cut rectangular patch antenna with tapered patch width are proposed. Tapering in patch width alters the input impedance at TM 10 mode in E-shape patch and at TM 10 and TM 02 modes in U-slot cut rectangular patch that yields increase in the bandwidth. Tapered design of E-shape patch gives bandwidth of 225 MHz (~26%) and that of U-slot cut patch yields bandwidth of 202 MHz (~22%). In another tapered width design of E and U-slot cut RMSAs, patch width is reduced at both the ends and these designs yields bandwidth of above 270 MHz (29%) and 212 MHz (22.2%), respectively. The varying width patches exhibit broadside radiation pattern with moderate increment in the values of broadside antenna gain. [ABSTRACT FROM AUTHOR]

Abstract Design of compact multiple slots cut F-shape microstrip antenna for broadband dual polarized response is presented. The multiple rectangular slots in F-shape patch, tunes the resonance frequency and impedance at second order TM 20 mode with reference to the fundamental TM 10 mode, that yields bandwidth of more than 500 MHz (>40%). Because of orthogonal current variations across TM 10 and TM 20 modes, F-shape patch yields dual polarized wideband response. The bandwidth of individual polarization is governed by the stub length in F-shape patch. Proposed antenna exhibits broadside radiation pattern over the bandwidth with gain of more than 6 dBi at two resonant modes. [ABSTRACT FROM AUTHOR]

Abstract Novel design of Phi-shape microstrip antenna for circular polarized response is presented. The placement of dual stubs in Phi-shape structure optimizes the spacing between degenerated orthogonal TM 11 modes of equivalent circular ring patch that yields circularly polarized response. With reference to patch dual orthogonal TM 11 modes and next higher order TM 21 mode, Phi-shape patch yields VSWR bandwidth of nearly 700 MHz (> 55%) with AR BW of 56 MHz (5.64%). The antenna gives broadside radiation pattern with peak broadside gain of above 8.5 dBi over the VSWR bandwidth. [ABSTRACT FROM AUTHOR]

Novel designs of modified rectangular shape printed monopole antenna for Ultra wide band response are proposed, which gives bandwidth across 1GHz-10 GHz range. Further two variations of rectangular shape patches to realize tunable notch characteristics, are also presented. They yield tunable notch characteristics in two different frequency bands. Proposed antennas give broadside radiation pattern with peak gain of 2 dBi. [ABSTRACT FROM AUTHOR]

Novel design of modified triangular shape microstrip antenna for circular polarized response is presented. In modified design, an offset distance between two triangular shape patches optimizes spacing between patch TM 10 and TM 01 resonant modes to realize axial ratio bandwidth of 49 MHz (5.32%) with VSWR BW of 531 MHz (50.11%). It gives broadside radiation pattern over entire VSWR BW with peak antenna gain of more than 9 dBi. [ABSTRACT FROM AUTHOR]

ABSTRACT Analysis and design of broadband 90° Sectoral microstrip antenna derived from 270° Sectoral patch is proposed. The formulation in resonant length at its fundamental mode and procedure to design 90° patch at different frequencies is presented. The proposed 90° patch yields higher bandwidth with better radiation pattern characteristics as compared to equivalent circular, 270° Sectoral, rectangular and their slot cut variations. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:927-932, 2016 [ABSTRACT FROM AUTHOR]

???A very popularly used technique to realize broadband and compact microstrip antenna (MSA) is by cutting a slot at an appropriate position inside the patch. More frequently, U-slot and its variation, a half U-slot, have been used to increase the bandwidth (BW). In most of the available literature on U-slot cut antennas, a detailed explanation for broadband response due to U-slot has not been reported. In this paper, an extensive study for the broadband behavior for U-slot, half U-slot and double U-slot cut rectangular MSAs (RMSAs) is presented. The U-slot configurations with different aspect ratios (i.e., length-to-width ratio) for patch and slot dimensions have been studied. In U-slot and half U-slot cut patches, it has been observed that slot does not introduce any additional mode, but it modifies the fundamental and higher order mode resonance frequencies of the patch to yield broadband response. The slot also modifies surface current distribution at higher order mode to yield broadside radiation pattern characteristics over the complete BW, without any variations in the directions of principle planes. Further, in double U-slot cut RMSA, the second U-slot optimizes the impedance and frequency at modified higher order TM21 mode and, along with modified TM01 and TM20 modes, yields increase in the BW. This paper will give an insight into the functioning of U-slot cut antennas. [ABSTRACT FROM PUBLISHER]

Broadband gap-coupled array configuration of proximity fed rectangular microstrip antenna with half E-shaped microstrip antennas are proposed. The rectangular slot in half E-shaped patch reduces the orthogonal TM mode resonance frequency of equivalent rectangular patch and along with TM modes of fed and parasitic rectangular patches, yields broader bandwidth of more than 470 MHz (>45%). An improvement in radiation pattern and gain characteristics over the bandwidth is obtained by gap-coupling half E-shaped patches along all the edges of proximity fed rectangular patch, which yields bandwidth of nearly 510 MHz (∼49%). Further to enhance the gain, a gap-coupled 3 × 3 array configuration of half E-shaped patches with proximity fed rectangular microstrip antenna is proposed. The gap-coupled array configuration yields bandwidth of more than 530 MHz (>50%) with broadside radiation pattern and peak gain of 11 dBi. [ABSTRACT FROM AUTHOR]

The compact C-shaped microstrip antenna derived from rectangular microstrip antenna has been mainly analyzed at its fundamental mode. In this paper, fundamental and higher order modes of proximity fed C-shaped microstrip antennas are discussed. The broadband proximity fed C-shaped microstrip antenna is proposed. At its fundamental mode, it yields bandwidth of more than 230 MHz (> 23%) with broadside radiation pattern and peak gain of more than 7 dBi. Further increase in its bandwidth is realized by cutting rectangular slot on the edges of the patch. The slot reduces TM01 mode frequency of C-shaped patch and along with its TM10 mode, yields bandwidth of more than 260 MHz (> 28%). To increase the gain, gap-coupled configuration of two C-shaped microstrip antennas is proposed. This gives bandwidth of more than 300 MHz with peak gain of 7.7 dBi. Further to enhance the bandwidth, gap-coupled configuration of two rectangular slot cut C-shaped microstrip antennas is proposed. The slot reduces TM01 mode frequency on each of the C-shaped patches and along with TM10 modes, yields bandwidth of more than 400 MHz (~40%) with broadside radiation pattern and peak gain of more than 8 dBi. [ABSTRACT FROM AUTHOR]

The broadband and dual-band rectangular microstrip antenna is realized by cutting pair of toothbrush-shaped or step slots along the non-radiating edges of the patch. The toothbrush-shaped slot is said to introduce TMd0 mode in between the TM10 and TM20 modes of the rectangular patch and realizes broadband response. In step slot cut configuration, the slot introduces a mode near the TM10 mode resonance frequency of the patch and realizes dual frequencies. In this paper, a detail analysis to study the effect of slots on the broadband and dual-band response in these rectangular microstrip antennas (RMSAs) is presented. It was observed that the slot does not introduce any mode but modifies the resonance frequency of higher order orthogonal mode and realizes broadband and dual-band response. The slot alters the direction of surface currents at higher order mode and gives similar radiation pattern characteristics over the broader bandwidth and at the dual frequencies. In broadband RMSA, a formulation of resonant length at modified TM02 mode is proposed. The frequency calculated using the same closely agrees with the simulated result. [ABSTRACT FROM AUTHOR]

A new Ψ -shaped microstrip antenna is reported, which increased the bandwidth of the E-shaped microstrip antenna by cutting an additional pair of slots on the other radiating edge of the E-shaped patch. The Ψ -shaped patch yielded a bandwidth of nearly 60% at a center frequency of around 5500 MHz. It gave a maximum gain of more than 10 dBi, which reduced to less than 4 dBi towards the higher frequencies of the bandwidth. In this paper, the broadband responses of the E-shaped and the reported Ψ -shaped patches are studied. In the E-shaped patch, the pair of rectangular slots did not introduce any mode, but modified the TM20 mode's resonance frequency of the patch and, along with the fundamental TM01 mode, resulted in the broadband response. Furthermore, when an additional pair of slots were cut to realize the Ψ -shaped patch, they modified the higher-order TM21 mode's resonance frequency of the patch. Along with the modified TM20 and TM01 modes, this yielded a larger bandwidth. Since the TM21 mode was present towards the higher frequencies of the bandwidth, the gain was reduced to less than 4 dBi. Furthermore, a proximity-fed design of a Ψ -shaped microstrip antenna in the same frequency band was proposed. The proposed configuration gave a higher bandwidth compared to the reported Ψ -shaped patch, with better gain characteristics over the bandwidth. A proximity-fed design of the Ψ -shaped patch in the 1000 MHz frequency band was also proposed. It gave a bandwidth of more than 50% with a broadside radiation pattern, and a gain of more than 8 dBi over the complete bandwidth. [ABSTRACT FROM AUTHOR]

The broadband proximity-fed rectangular microstrip antenna (RMSA) is proposed. The proximity-fed antenna has larger bandwidth (BW) and is simpler in design when compared with L-probe-fed RMSA. Further, the BW of proximity-fed antenna is increased by using multiresonator or slot cut configurations. The proposed antennas give a BW of more than 300 MHz (>30%) with broadside radiation pattern with peak gain of 8.5 dBi. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:294-300, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25723 [ABSTRACT FROM AUTHOR]

ABSTRACT A new 270° sectoral microstrip antenna (MSA) is proposed. It has additional resonance mode whose frequency lies below the fundamental mode of equivalent circular patch. Furthermore, slot cut 270° sectoral MSA is proposed. It gives bandwidth of more than 500 MHz (> 45%) with broadside radiation pattern and peak gain of 8.5 dBi. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1447-1449, 2014 [ABSTRACT FROM AUTHOR]