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In this paper, a design of compact ultra-wideband (UWB) bandpass filter with a ultra-narrow notched band is presented. The UWB frequency responses are achieved by using a microstrip-CPW broadside coupling structure. And a pair of side-coupled short-circuited microstrip lines is introduced to generate an ultra-narrow notched band. Based on this design, by loading a pair of varactor diodes at the end...
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