Broadband high gain SIW ring slot antenna

The slot antenna backed by the substrate integrated waveguide (SIW) cavity usually demonstrates very narrow bandwidth. In this paper, we extend the interpretation to our original dual mode SIW ring slot antenna so that a broadband radiation property based on the TE102 mode is unveiled for the first time. Through the experimental verification, over 12% bandwidth is conveniently achieved. The realized gain reaches over 7 dB. Its broadband working principle is studied in details. Simulated and measured data are both presented to verify the proposed ideas.