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Deshmukh A.A.,EXTC | Desai A.A.,EXTC | Kadam P.,EXTC | Ray K.P.,SAMEER
2016 IEEE Annual India Conference, INDICON 2016 | Year: 2016

Broadband Microstrip antennas using E-shaped patch is reported. Here, a new design of E-shaped patch antenna is proposed for ultra-wide band response. A detailed parametric study explaining the effects of various patch parameters like, slot dimensions and their position, microstrip feed line dimensions and its position along the patch base is presented. The slots and feed line position in the patch optimizes the impedances over lower and higher order resonant modes which yields ultra-wide band response. A bandwidth from less than 1.5 GHz to more than 10 GHz is obtained in E-shaped patch design. The E-shaped patch yields bore sight radiation pattern with gain of around 1 to 2 dBi over most of the bandwidth. © 2016 IEEE.


Deshmukh A.A.,EXTC | Ray K.P.,SAMEER
IEEE Antennas and Propagation Magazine | Year: 2012

Dual-band and broadband rectangular microstrip antennas are realized by cutting U slots, V slots, or a pair of rectangular slots inside the patch. In these designs, depending upon where the slot is cut, the slot length is taken to be equal to either a quarter-wavelength or a half-wavelength in length. However, these simpler approximations of slot length as a function of frequency do not give a close match for different slot lengths and their positions inside the patch. In this paper, the surface currents and voltage distributions for a dual-band pair of rectangular slots, and for U-slot-cut rectangular microstrip antennas, are studied over a wide frequency range. It was observed that the slot does not introduce any mode, but reduces the higher-order orthogonal mode resonance frequency of the patch and, along with the fundamental mode, realizes the dual-band response. Furthermore, by studying the current and voltage distributions, a formulation for the slot's resonant length on a glass epoxy substrate was proposed. The frequencies calculated using the proposed formulations agreed well with the simulated values, with an error of less than 5%. These formulations were also validated on RT-duroid substrate. © 2011 IEEE.


Deshmukh A.A.,EXTC | Ray K.P.,SAMEER
IEEE Antennas and Propagation Magazine | Year: 2014

The fundamental and higher-order modes of a compact ring microstrip antenna are discussed. This provides insight into the functioning of this configuration. To increase its bandwidth and gain, various broadband proximity-fed configurations of a ring microstrip antenna in the 1000 MHz frequency band are proposed. A detailed explanation for the broadband behavior of all these configurations is presented. The proximity-fed square-ring antenna yielded a bandwidth of more than 250 MHz. A further increase in its bandwidth was realized by cutting a pair of rectangular slots on the edges of the ring patch. The pair of slots reduced the orthogonal TM02 mode's resonance frequency of the patch and, along with the fundamental TM10 mode, yielded a bandwidth of more than 350 MHz. Furthermore, the proximity-fed gap-coupled configurations of rectangular-slot-cut C-shaped patches, which were derived from the ring patch, are proposed. These yielded a bandwidth of more than 500 MHz (>43%). Both of these slot-cut compact configurations gave broadside radiation patterns with gains of more than 6 dBi over the bandwidth. To further increase the gain and bandwidth of the slot-cut ring antenna, a multi-resonator configuration with parasitic ring patches, gap-coupled along the two coordinate axes, is proposed. This configuration yielded a bandwidth of more than 400 MHz with a peak gain of 9 dBi. In this configuration, a further increase in the bandwidth was realized by cutting a pair of rectangular slots on the edges of the ring patches that were gap-coupled along one of the coordinate axes. This configuration gave a bandwidth of more than 500 MHz with a peak gain of 9 dBi. © 1990-2011 IEEE.


Deshmukh A.A.,EXTC | Ray K.P.,SAMEER | Kadam A.,EXTC
International Journal of Microwave and Optical Technology | Year: 2012

The broadband microstrip antenna is realized by fabricating the patch on thicker substrate having lower dielectric constant. The simpler proximity feeding technique increases the antenna bandwidth for substrate thickness greater than 0.06λ 0. A larger gain is realized by using the individual antenna elements in an array configuration. However, an antenna arrays have smaller bandwidth as it is decided by the fed patch. In this paper, a broadband proximity feed gapcoupled designs of rectangular microstrip antennas by coupling the patches along both; radiating and non-radiating edges in the 1000 MHz frequency band are proposed. The proposed MSAs give a bandwidth of more than 300 MHz with broadside radiation pattern and gain of more than 8 dBi. Further, gap-coupled array configurations of proximity feed 3 × 3, 5 × 3 and hexagonally arranged configuration of rectangular microstrip antennas are proposed. The 3 × 3 design gives a bandwidth of nearly 400 MHz with peak gain of 10 dBi, whereas the 5 × 3 design gives a bandwidth of more than 500 MHz (> 50%) with a peak gain of 11 dBi. The two variations of hexagonal rectangular microstrip antenna arrays give a bandwidth of more than 400 MHz. © 2012 ISRAMT.


Deshmukh A.A.,EXTC | Ray K.P.,SAMEER
IEEE Antennas and Propagation Magazine | Year: 2013

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 TM 21 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 proximityfed 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. ©2013 IEEE.


Deshmukh A.A.,EXTC | Ray K.P.,RFMSD
IEEE Antennas and Propagation Magazine | Year: 2013

A broadband configuration of a shorted-plate folded L-slot-cut folded-feed rectangular microstrip antenna was reported, which gave a bandwidth of 2840 MHz (133%). The broader bandwidth was obtained due to the coupling between various modes, which were either a half-wave or a quarter-wave in length. However, a clear description of the modes of the shorted patch that resulted in the broadband response was not given. In this paper, an analysis studying the broadband response of the reported configuration is presented. By studying the voltage and current distributions on the shorted patch, a formulation for its resonance frequency is proposed. The frequencies calculated using the proposed equation closely agreed with the simulated results. Furthermore, the broadband response of the reported configuration was analyzed by studying its resonance-curve plots and surface-current distribution. It was observed that the folded patch and a wing-like extension on the folded-patch portion, the L-slot, and the folded feed modified the various fundamental and higher-order mode resonance frequencies (such as f1/4, 0, f1/4, 1, etc.), as well as the impedances at these frequencies, to yield the broadband response. Furthermore, by optimizing the folded feed length, an increased bandwidth of 3504 MHz (139.2%) was obtained. Over the bandwidth, this configuration showed a radiation pattern with higher cross-polarization levels and with a gain of more than 5 dBi. © 2013 IEEE.


Deshmukh A.A.,EXTC | Jain A.R.,EXTC | Ray K.P.,RFMS
Microwave and Optical Technology Letters | Year: 2014

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 Copyright © 2014 Wiley Periodicals, Inc.


Shinde J.,EXTC | Jadhav R.,EXTC
Communications in Computer and Information Science | Year: 2013

In a conventional cellular network, a terminal receives signals not only from the base station of that cell, but also from other cell base stations. This inter-cell interference has more impact on the cell-edge users, in multi cell environment. The inter-cell interference degrades the performance of wireless systems. Using Base Station Cooperation, the ability of a mobile station to receive signals from multiple base stations can be utilized as an opportunity to improve the spectral efficiency and to get higher data rates for cell edge users. In multi cell environment using base station cooperation overall interference can be minimized marginally, whereas the interference within the cooperation region is largely reduced. This leads to a question whether it is worth doing cooperation all the time. However increase in terms of throughput may not always be enough to increase the throughput of each of the user.Hence for such a scenario the distinct cooperation scheme is used. The distinct cooperation is a joint transmission scheme in which the selection criterion is based on user's signal to interference plus noise ratio (SINR) is proposed and the capacity achieved through cooperation is shared equally among the cell-edge users. Here we will analyze the normal operation, full cooperation and distinct cooperation scheme in the downlink environment for cell edge users in cellular network and we will compare and see which method improves the user capacity and data rate. © 2013 Springer-Verlag Berlin Heidelberg.


Deshmukh A.A.,EXTC | Ray K.P.,SAMEER IIT Campus
IEEE Antennas and Propagation Magazine | Year: 2011

The bandwidth of a microstrip antenna is increased by using a thicker and lower-dielectric-constant substrate, or by using multi-resonator gap-coupled and stacked configurations, or by cutting a resonant slot inside the patch. However, with all of these methods, the bandwidth of the antenna is limited by the probe's inductance for substrate thicknesses greater than 0.060 to 0.070. For substrate thicknesses larger than 0.070, the bandwidth of the antenna can be increased by using a proximity-feeding method. In this paper, by using a combination of the proximity feeding technique and a thicker substrate, various broadband configurations of gap-coupled rectangular microstrip antennas, E-shaped and half-E-shaped microstrip antennas, and gap-coupled half-E-shaped microstrip antennas are proposed. All of these configurations give bandwidths in excess of 350 MHz ( 35% ), with gains of more than 7 dBi, in the 800 to 1200 MHz frequency band, with a broadside radiation pattern. © 2006 IEEE.


Deshmukh A.A.,EXTC | Phatak N.V.,EXTC
Microwave and Optical Technology Letters | Year: 2016

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.

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