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Novel microstrip dual-band bandpass filter with wide stopband and high isolation

✍ Scribed by Xuehui Guan; Wei Fu; Guohui Li; Shan Jiang; Haiwen Liu

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
682 KB
Volume
53
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

A novel microstrip dual‐band bandpass filter (BPF) using spur‐line‐loaded stepped‐impedance resonator (SIR) is proposed in this letter.Anti‐parallel coupled microstrip line is used to realize the dual‐band coupling and produce a transmission zero within two passbands. High isolation between two passbands is achieved. A spur‐line is loaded to the SIR to eliminate the higher spurious frequencies of the resonator. A dual‐band BPF with central frequencies of 2.4 and 5.6 GHz is designed. The designed filter has a wide stopband below −20 dB from 6 GHz to 11 GHz. Isolation between two passbands is below −60 dB. All the theoretical analysis and design procedures are discussed. The predicted performance of the dual‐band BPF is confirmed in experiment. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:803–806, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25881

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