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A low-profile wideband antenna is designed by employing the high impedance surface (HIS) as ground reflector of bowtie antenna. The overall thickness is less than 0.1λ at the lowest operating frequency. The ground size effect to the performance of antenna is investigated. It achieves relatively wide bandwidth of 33.3% for the 6×6 HIS array, and 36.4% for the 4×6 array. The peak directive gains of...
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