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Compact balanced bandpass filter using interdigital line resonator with high common‐mode noise suppression
Author(s) -
Chen Jianzhong,
Chen Jia
Publication year - 2012
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.26737
Subject(s) - resonator , passband , band pass filter , microstrip , microwave , noise (video) , physics , equivalent circuit , acoustics , electronic engineering , electrical engineering , materials science , optoelectronics , telecommunications , engineering , optics , computer science , voltage , artificial intelligence , image (mathematics)
A novel balanced microstrip bandpass filter (BPF) using compact interdigital line resonator (ILR) is proposed in this article. The presented balanced BPF has shown good common‐mode (CM) noise suppression, while the size is reduced. For design purposes, the differential‐mode (DM) and CM equivalent circuits of the ILR are given. The DM resonator has a smaller size compared to the conventional quarter‐ and half‐wave resonators. In addition, the CM resonant frequency is much higher than the DM resonator frequency in the ILR. Based on this property, the CM response can be strong suppressed over the DM operating frequency range. A fourth‐order balanced BPF with a size of 23 × 22.5 mm 2 and 50 dB CM noise rejection within the passband is demonstrated and measured. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:918–920, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26737