Abstract
Higher-order TM0n mode radiation from a rectangular patch antenna (RPA) is unwanted due to its low-gain, poor co-cross polarization (CP-XP) isolation and adverse effect on the TMm0 mode radiations. In this work, a substrate-integrated-waveguide structure is utilized to improve the gain and suppress the co-cross polarization of a multi-mode RPA. The feeding location of the conventional RPA is optimized to obtain a quad-band operation including dominant TM10 modes and the higher-order, TM30, TM02 and TM04 modes. Similar feeding method is used for the proposed thin substrate-integrated (SI) waveguide structure also supports the quad-band resonance. The proposed structure exhibits a higher gain, and excellent CP-XP isolation in all four operating bands. The XP radiations are extensively studied and it is shown that, the TM0n modes (L/W<1), orthogonal to the TMm0 modes of a conventional RPA can also be constructively used. Good agreement is found between simulated and measured results.
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