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Deshmukh A.A.,DJSCOE | Ray K.P.,SAMEER
IET Microwaves, Antennas and Propagation | Year: 2015

Slot cut compact shorted 60° sectoral microstrip antenna and its complementary configuration are proposed. The slot optimises the spacing between higher order TM1/4,1 and fundamental TM1/4,0 modes to yield broadband response. On air substrate of thickness 0.105l0, shorted 60° sectoral patch antenna yields a bandwidth (BW) (VSWR ≥ 2) of more than 600 MHz (821-1428 MHz, ~54%), whereas its complementary configuration yields BW of more than 480 MHz (655-1142 MHz, > 50%). The proposed antennas show a broadside radiation pattern with a gain of more than 3 dBi over the complete BW. © The Institution of Engineering and Technology 2015. Source


Deshmukh A.A.,DJSCOE | Deshmukh A.A.,D.J.Sanghvi College of Engineering | Ray K.P.,SAMEER
IETE Journal of Research | Year: 2011

The dual-band microstrip antennas (MSAs) are realized by placing the stub on the edges of the patch or by cutting a slot at an appropriate position inside the patch. The multiband MSAs are realized by using the combination of the slot and stub. In this paper, by cutting a rectangular slot on the radiating edge and half U-slot on the nonradiating edge of a rectangular MSA, a dual-and triple-band rectangular MSA are proposed. These slots are of nearly quarter wave in length and by changing their lengths, tuning of the frequencies is realized. Also, the multiport network models for these multiband MSAs are proposed, which helps in understanding the mode distributions at slot and patch frequencies. To realize the higher gain, the suspended configurations of these multiband antennas are also proposed. A good agreement is obtained between the simulated, multiport network model, and measured results. © 2011 by the IETE. Source


Deshmukh A.A.,DJSCOE | Ray K.P.,SAMEER
Microwave and Optical Technology Letters | Year: 2011

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. Source


Deshmukh A.A.,DJSCOE
AEU - International Journal of Electronics and Communications | Year: 2014

Various gap-coupled array configurations of ring microstrip antennas and rectangular slot cut ring microstrip antennas with proximity fed slot cut ring microstrip antenna for larger bandwidth and gain are proposed. The rectangular slot in ring patch reduces its orthogonal TM01 and TM02 mode resonance frequencies and along with TM10 modes of fed and parasitic ring patches, yields broadband response. The gap-coupled configuration with ring patch and slot cut ring patch yields bandwidth of nearly 430 MHz with broadside radiation pattern and peak gain of more than 9 dBi. By gap-coupling ring patches along all the edges of proximity fed pair of slot cut ring patch, a 3 × 3 ring microstrip antenna array is realized. It yields bandwidth of more than 460 MHz with peak gain of more than 10 dBi. To further improve upon the bandwidth, a 3 × 3 array of ring patches in which rectangular slot is first cut on the edges of ring patch which are gap-coupled along x-axis and further cut inside the patches which are gap-coupled along x and diagonal axes, is proposed. Both of these configurations yield bandwidth of more than 500 MHz (>45%) with a peak gain of around 10 dBi. © 2014 Elsevier GmbH. Source


Deshmukh A.A.,DJSCOE | Ray K.P.,SAMEER
Progress In Electromagnetics Research C | Year: 2011

The broadband microstrip antenna is realized by cutting the slot inside the patch. The slot introduces a resonant mode near the fundamental resonance frequency of the antenna and realizes broadband response. The compact variations of circular microstrip antenna are realized by placing the shorting posts along the zero field line at the fundamental mode. These shorted antennas have narrower bandwidth. In this paper, a compact half U-slot cut shorted sectoral microstrip antenna is proposed. The detailed analysis has been carried out to study the effect of the slot on various modes of the sectoral patch. It has been observed that the half U-slot does not introduce any additional mode, but reduces the resonance frequency of the higher order mode of the shorted sectoral patch and along with its fundamental mode realizes broader bandwidth. The bandwidth of more than 700 MHz, at the center frequency of approximately 2700 MHz, has been realized. Source

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