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A novel differential bandpass filter with ultra‐wide band common‐mode suppression
Author(s) -
Zhang XiaoYu,
Wang Yang,
Lee JongChul
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31795
Subject(s) - passband , stopband , band pass filter , insertion loss , return loss , center frequency , bandwidth (computing) , transition band , band stop filter , common mode signal , elliptic filter , physics , fractional bandwidth , electronic engineering , materials science , prototype filter , low pass filter , optics , engineering , telecommunications , digital signal processing , analog signal , antenna (radio)
A compact differential filter with ultra‐wide band common‐mode (CM) suppression is proposed. Ultra‐wide band property is achieved by the frequency‐selecting coupling structure (FSCS), which generates three transmission zeros in the passband of differential‐mode (DM) as well as in the stopband of CM. Moreover, the position of the transmission zeros, the CM insertion loss and the DM return loss can be customized by designing the parameters of the FSCS. To verify the concept, a filter has been designed, simulated and measured. The proposed filter shows the center frequency of 2.45 GHz with a DM 3 dB fractional bandwidth of 51% and a CM 20 dB fractional bandwidth of 108.6%.