Abstract
This study proposes a novel radiating element to enhance the bandwidth of a substrate-integrated waveguide-based resonant slot array antenna. Unlike the conventional scheme, the proposed element has two parallel slots of unequal length. The long slot dominates the radiation, while the short one deals with the matching. An amplitude-tapering power divider was integrated into a 5 × 4 element array to restrain the E-plane sidelobe level (SLL). The measured − 10 -dB bandwidth is 23.14–25.4 GHz (9.42% @24 GHz). The E-plane and H-plane SLLs are − 22.04 and − 30.34 dB, respectively. The cross-polarised levels in the operating band are < − 30 dB and a peak gain of 17.77 dBi was measured at 24.2 GHz. A good agreement is observed between the simulated and measured results and then validates the feasibility of the bandwidth-enhanced slot pair proposed herein.
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