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In this article, a design of high selectivity and wide stopband ultrawideband (UWB) filter based on the asymmetric step‐impedance resonator (SIR) with split‐end is proposed. By properly selecting the impedance ratio, R, and the length ratio, α, and arranging the length of split‐ends of the asymmetric SIR, the good UWB passband using only one asymmetric SIR is realized from 2.9 to 5.1 GHz. Moreover,...
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