Bandpass Filter Using Dual Series-Cascaded Ring Resonators with Multiple Transmission Zeros

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Conference Proceeding
2018 IEEE International Conference on Computational Electromagnetics, ICCEM 2018, 2018
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© 2018 IEEE. Compact dual series-cascaded ring resonators comprised of three parallel-coupled lines are proposed for design of fifth-order bandpass filter (BPF) with multiple transmission zeros. Two pairs of ±b3λg/4 parallel-coupled lines are cascaded to a pair of ±bλg/4 parallel-coupled lines to construct dual ring resonators, which can achieve a high-performance BPF with five transmission poles and eight transmission zeros. For further demonstration, a filter example centered at 2.08 GHz is designed with source-load cross coupling to obtain nine transmission zeros.
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