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Abstract
A gain enhanced method of substrate integrated waveguide (SIW) cavity backed slot antenna by using a high order cavity resonance has been presented in this paper. When the TE220 resonance is excited in the SIW cavity, a high gain radiation with the gain of 8.1 dBi can be achieved, which is about 2.7 dB higher than that of the previously presented SIW cavity backed slot antenna by using the TE120 or TE210 resonance. This design method can be extended to using the higher order cavity resonances such as TE230, TE330 and TE440 etc. to get a much higher gain radiation. Compared with an antenna array which has the same gain, the proposed antenna has advantages of simple feed network and more compact size.