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High Selectivity and Wide-Stopband Quintuple-Mode Bandpass Filter with Multiple Transmission Zeros

Abstract A compact multi-mode bandpass filter with high selectivity and a wide stopband is proposed in this article. The quintuple-mode resonator is proposed by introducing a triple-mode resonator into a dual-mode resonator. Due to the intrinsic characteristic of the proposed resonator, two transmission zeros are created at both sides of the passband for enhancing selectivity. Furthermore, two transmission zeros are generated by the input and output feed lines, leading to sharp skirts and a wide stopband. The simulated responses show a 3-dB fractional bandwidth of 25.8% at the central frequency (2.4 GHz). Measurement results agree well with the simulated results.