Abstract
Experimental investigations conducted on the multilayer electromagnetically coupled microstrip stacked antenna at 3.2 GHz reveals that the antenna with one parasitic element improves the radiated power by 4.94 dB. Radiation pattern with 2 and 3 parasitic elements showed the minimum beamwidth of 29° and 21° as compared 33° and 29° for driven patch. The air gap spacing of 2.8 mm resulted into additional enhanced radiated power by 3.92 dB and improved the beamwidth from 28° to 23° as compared to zero spacing. Paper dielectric spacer indicated an optimum thickness of 0.635 mm that improved the radiated power by 6.25 dB and beam width to 9° as compared 28° for zero spacing. Single parasitic element loading provided the best match between the feed line and patch as compared to two or more parasitic elements. The bandwidth is found to depend directly on the number of parasitic element. In general the radiated power and beamwidth depend on number of elements and interelement dielectric spacing. Typically antenna starts radiating isotropically in half space when spacing between active patch and the first parasitic element (= S1) is 1.4 mm and the spacing between first and second parasitic elements (= S2) is 2.8 mm air spacing.
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