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Based on the square patch frequency selective surface (FSS) element, a novel FSS unit is proposed in this paper. And the novel FSS unit is used as a spatial filter to improve the performance of the antenna. The single-layer FSS(SL-FSS) and double-layer FSS(DL-FSS) are respectively loaded onto the K band microstrip antenna. And the gain of antenna has been improved. The gain has increased by almost...
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