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This paper introduces a new ultra wideband (UWB) bandpass filter (BPF) with very sharp roll-off characteristics in stripline structure for the U.S. band (3.1-10.6 GHz). The UWB characteristic is basically obtained from capacitive coupling between a main line and a λ/2 length cross resonator. At the center of the resonator, two stubs are loaded, one is λ/8 short-circuited and the other λ/8 open-circuited...
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