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Bandpass filter using coupled‐line‐stub cascaded structure with high stopband rejection
Author(s) -
Lu Sen,
Xu KaiDa,
Guo Yingjiang,
Ren Yi,
Chen Qiang
Publication year - 2021
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.32555
Subject(s) - stopband , band pass filter , stub (electronics) , topology (electrical circuits) , electronic engineering , physics , transition band , bandwidth (computing) , prototype filter , computer science , low pass filter , engineering , electrical engineering , telecommunications
A compact fifth‐order bandpass filter (BPF) with high stopband rejection level is proposed using a coupled‐line‐stub cascaded structure (CLS‐CS). Based on transversal signal‐interference technique, the CLS‐CS is introduced to improve the characteristics of the filter, generating four new transmission zeros (TZs) close to band edge. The positions of all TZs are calculated through input impedance deduction. For demonstration, a BPF prototype centered at 2.1 GHz is designed with measured 3‐dB fractional bandwidth of 39% (1.68‐2.50 GHz) and stopband rejection levels of over 28.9 dB, which validates the proposed idea .