Circular polarized rectangular loop antenna over a mushroom-like EBG surface

Abstract

In this paper, a low profile dual loop wire antenna over an EBG surface is investigated for wideband circular polarization. A wideband mushroom-like EBG surface is used as the antenna ground plane. In comparison with a PEC ground plane, design of the antenna above an EBG ground plane results in 60% reduction of the structure thickness. It is shown that the axial ratio bandwidth (<3 dB) and return loss bandwidth (<10 dB) of the dual loop antenna above the designed EBG surface are 20% and 14%, respectively.