High selectivity and CM suppression microstrip balanced BPF and balanced-to-balanced diplexer
作者： Hongwei Deng , Yongjiu Zhao , Yong Fu , Ying He , Xiaojun Zhao
DOI: 10.1080/09205071.2013.799445
关键词:
摘要: In this paper, a new compact microstrip balanced bandpass filter (BPF) and balanced-to-balanced diplexer are designed with high selectivity common-mode (CM) suppression. The equivalent differential-mode (DM) CM half-circuits of the proposed BPF analyzed in detail. Under DM excitation, filtering topology is formed by two coupling quarter-wavelength resonators (QWR) source-load short-ended feedlines. Two transmission zeros can be generated near passband edge to achieve selectivity. zero between QWR feedline adjusted shorted stub loaded at center passband. Moreover, mutual loading effect filters uniform approximately resonator stub. Hence, BPFs generate deepen the...
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