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A reconfigurable active frequency selective surface (AFSS) with ultra‐wideband (UWB) characteristics is presented in this article. The proposed AFSS consists of a periodic array of three metal layers and two dielectric layers. PIN diodes are arranged on the top and bottom metal layers which can rebuild the function of AFSS. The transmission bandwidth of the AFSS with OFF‐state diodes is 8 to 12.5...
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