Nagendra Prasad Yadav

COMPACT SHORTED MICROSTRIP PATCH ANTENNA FOR DUAL BAND OPERATION

In the present paper notch loaded shorted microstrip patch antenna has been analysed using cavity model. The proposed antenna shows dual band operation which depends on notch dimensions as well as shorting wall. The frequency ratio is found to be 1.5278 for the notch loaded rectangular patch, while in notch loaded shorted patch, the frequency ratio varies from 2.9764 to 2.725 for increasing value of notch width and it is almost invariant with notch depth. Further a slot loaded shorted patch antenna shows the dual frequency nature with the frequency ratio 1.7. The theoretical results are compared with IE3D simulation as well as reported experimental results.

ANALYSIS OF SHORTING PIN LOADED HALF DISK PATCH ANTENNA FOR WIDEBAND OPERATION

In the present paper the analysis of notch loaded shorted half disk patch is given. It is found that the bandwidth of the antenna depends inversely on the notch width whereas it is invariant with the notch length. Further, the antenna shows dual band behavior for a gap spacing below 7.5mm in the gap coupled half disk shorted patch whereas it behaves as a wideband antenna for gap spacing more than 7.5mm. Theoretical results are compared with simulated and experimental results.

Compact Half U-Slot Loaded Shorted Rectangular Patch Antenna for Broadband Operation

In this paper, analysis of half U-slot loaded patch antenna with shorting wall is presented. The parameters of the antenna signiflcantly depend on slot and notch dimensions. Bandwidth of the proposed antenna is found to be 21.59%. The 3dB beamwidth of the antenna is found to be 90 - at the central frequency of 2.6GHz. The theoretical results are compared with IE3D simulated and experimental ones which are in good agreement.

Analysis of Multilayer Rectangular Patch Antenna for Broadband Operation

In this paper analysis of multilayer patch antenna has been carriedout. The antenna shows the broad bandwidth when a patch is stacked over fed patch in gap coupled structure. Typically a 42.65% bandwidth is achieved in three layer antenna. Further the bandwidth of the antenna depends inversely on the gap(s). The gain of the antenna is found to be 6.08 dB with 3 dB beam width of 92°. The theoretical results are compared with IE3D simulation and reported experimental data.

Broadband rectangular microstrip antenna loaded with a pair of U-shaped slot

In this paper analysis of double U-slot loaded patch antenna is presented. The parameter of the antenna significantly depends on slot dimensions. Bandwidth of the proposed antenna is found 21.59 %. The 3dB beamwidth of the antenna is found to be 90° for the central frequency of 1.9 GHz. The theoretical results obtained from the analysis are compared with IE3D simulated and experimental results which are in good agreement.

Analysis of pair of L-shaped slot loaded patch antenna for WLAN application

A pair of L-shaped slot loaded rectangular patch antenna is analysed by using circuit theory concept which exhibits dual resonance behaviour. Two resonance frequencies are at 2.45 GHz and 5.125 GHz (experimental 2.44GHz and 5.12GHz, simulated 2.48 GHz and 5.2 GHz). The −10 dB bandwidth of lower and upper resonance frequency is 4.13 % (experimental 3.4 %, simulated 3.51 %) and 8.82 % (experimental 8.79 %, simulated 8.78 %) respectively. The frequency ratio of the antenna for a given dimension of L-slot is found to be 2.092 (experimental 2.098, simulated 2.097). The theoretical results are compared with the simulated results obtained from IE3D which are in close agreement.

Analysis of tunnel diode loaded stacked microstrip antenna

The theoretical investigations on tunnel diode loaded stacked microstrip antenna is presented using circuit theory concept based on modal expansion cavity model. The investigations reveal that better tunability, better matching and enhanced bandwidth of the stacked antenna can be achieved by adjusting bias voltage of tunnel diode only while the antenna topology remains unaltered. The operational frequency band of the tunnel diode loaded stacked antenna is dependant on bias voltage and can be varied from 400 MHz (bandwidth 10.50 %) to 540 MHz (bandwidth 13.20 %) with the bias voltage. On the other hand, the stacked antenna (without tunnel diode) shows frequency band of 210 MHz (bandwidth 4.49 %). The theoretical results are compared with the simulated results performed on IE3D Zeland Software version 14.05.

Gap-coupled stacked microstrip antenna for dual band operation

Theoretical investigations of a gap-coupled stacked microstrip antenna is presented using equivalent circuit concept. It is found that the antenna operates with dual frequency band characteristics with resonances at 4.76 GHz and 6.79 GHz. The dual nature of the antenna is realized by adding coplanar U-shaped parasitic elements around the radiating edges of the fed patch and stacking a rectangular patch above them. The lower and upper frequency bands are achieved as 443 MHz and 287 MHz respectively. The radiation patterns show shifts of 5deg towards left and 12deg towards right for lower and upper resonance frequencies respectively.