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A dual-polarized two-element Vivaldi array antenna recessed inside a lossless metallic cavity is presented. A novel approach based on properly integrating the array with a flared cavity is used to achieve a resonance-free ultra-wideband antenna with high gain, good impedance match, and low side lobe levels (SLLs)<−25dB over more than 4:1 bandwidth. Designed antenna is characterized experimentally...
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...
A development of Vivaldi antenna array fully recessed inside a metallic cavity is investigated. The antenna is first designed in free space with reflection coefficient < −10dB and a consistent gain better than 4 dB over 2 – 7 GHz bandwidth. The size of the cavity is varied and its interaction with the antenna is analyzed. The use of carefully placed high impedance surfaces and absorber is seen...
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