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A novel dual-band dual-mode microstrip bandpass filter (BPF) with compact size and high selectivity performance is proposed using a single short-stub-loaded stepped-impedance resonator (SIR). Owing to the source-load coupling and the intrinsic characteristics of the SIR, five transmission zeros can be generated near the passband edges and in the upper-stopband to improve the selectivity. A dual-band...
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