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An ultra-wideband (UWB) bandpass filter (BPF) with an electronically tunable notch band based on a folded stepped impedance resonator (SIR) is investigated. The proposed UWB BPF comprises four folded shunt quarter-wavelength short-circuited stubs, one SIR with a metallised via hole to ground and a varactor diode with DC bias. The SIR is studied and employed to generate one desired notched band. The predicted results are compared with measured data and good agreement is reported.
Date of Publication: Oct. 27 2011