Abstract
A Vivaldi antenna array integrated with a metallic lossless cavity for flush-mounting is proposed. A novel approach based on connecting the array's edge elements in E-plane to the cavity walls is utilized to eliminate the deleterious impact of cavity resonances. The designed ultra-wideband antenna exhibits resonant-free behavior with gain better than 5dBi, VSWR <2, and high-quality radiation patterns with side lobe levels (SLLs) <−20dB over more than 5:1 bandwidth. The designed array is fabricated and excellent agreement with simulations validates the theory behind this novel radiator.
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