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A wideband antenna having low cross-polarization level, based on a cavity slot element with a parasitic structure is proposed. The bandwidth of the antenna is 50% as demonstrated in the range 4.2 – 6.9 GHz (simulation) or 4.15 – 7.1 GHz (measurement). The cross-polarization level is −35 dB at the E-plane cut and −90 dB at the H-plane cut. The gain of the antenna is 6–7 dBi.
In this work, a cavity-slot, dual-polarized linear-cylindrical antenna array is proposed. The array is composed of 3 horizontal slots and 4 vertical slots at 3 GHz. The mutual coupling between a vertical slot and a horizontal slot is less than 30 dB, the average omni level ripple is 1 dB, and the average cross-polarization in the azimuth is less than 25 dB.
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