Abstract
A novel substrate integrated waveguide (SIW) cavity-backed self-diplexing leaky-wave antenna (LWA) is presented. The proposed design consists of 16 SIW cavity-backed slot elements. The SIW cavity-backed slot element can be fed by two separate ports to resonate at two different frequencies and offer good intrinsic isolation between two input ports. The proposed element is a typical self-diplexing antenna. By lining up these cavity-backed slot elements in a column, serial feeding the lower parts and the upper parts of these cavities separately, the SIW cavity-backed self-diplexing LWA can be achieved. The upper part of the proposed antenna works in 11-13.9 GHz with beam scanning from -5° to 39°. Meanwhile, the lower part works in 7.1-9.4 GHz with beam scanning from -43° to 56°. The isolation between two input ports is better than 20 dB. The measured results of the fabricated antenna prototype verify the simulation analysis.
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