Abstract
In this paper, a planar polarization independent resonant cavity antenna (RCA) is proposed to achieve higher gain with a single patch connection instead of using antenna arrays with additional feeding losses. The planar metasurface is based on sub-wavelength complementary circular metallic patches, which provide the same magnitude and phase response for both TE and TM polarized waves. In order to excite the metasurface, an aperture coupled antenna with a circular patch is used to make its integration easier with the metasurface. The proposed antenna design works from 8.97 GHz to 13.1 GHz with a measured 3dB gain bandwidth of 24.2 % and it is used to increase the antenna’s gain from 8 dBi up to 14.67 dBi. The RCA achieves the measured bandwidths (input matching <-10 dB) above 4 GHz or 37.4 %, among the highest reported in the literature with 2 layers.
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