Some studies on elliptical microstrip stacked antenna for circular polarization

159-162Experimental investigations conducted to examine the various radiation characteristics of the elliptical microstrip stacked antenna reveal that there is a significant improvement in radiated power level, gain, beamwidth and bandwidth of the antenna when stacked with number of symmetrical parasitic elements. Stacking of antenna with four parasitic elements is found to raise the radiated power level by 4.5 dB, improve the gain by 5 dB, reduce the beamwidth from 80° to 21° and enhance the bandwidth from 0.8% to 4.0% for VSWR 1.5:1 and from 1.3% to 7.0% for VSWR 2:1 as compared to single active element