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Effect of Thick Ground on the Performance of Slot Coupled Circularly Polarized Patch Antenna

In this paper, the effect of thickening the ground in an aperture coupled circularly polarized microstrip patch antenna is investigated. It is clearly shown that a ground thickness as small as 0.01λ has a considerable effect not only on return loss, but especially on circular polarization. A new simple technique is proposed to compensate for both. It involves modifying the slot width, but at the expense of a reduced bandwidth.