Compact Constant Bandwidth Tunable Wideband BPF With Second Harmonic Suppression


A compact tunable wideband bandpass filter (BPF) having constant absolute bandwidth (CABW) with tunable selectivity and second harmonic suppression is presented in this letter. The BPF is designed using non-uniform quarter-wave spiral resonators loaded with varactor diodes and a capacitively coupled stub. The BPF consists of combline coupled section also… (More)


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