Design of tri‐band microstrip BPF using SLR and quarter‐wavelength SIR

• DOI: 10.1002/mop.27247
• Publication Date: 2012-11-20T12:01:46Z
• Authors: Hong‐Wei Deng; Yong‐Jiu Zhao; Yong Fu; Xiao‐Jun Zhou; Yan‐Yun Liu
• Keywords: Passband; Stub (electronics); WiMAX; Multi-band device

Abstract A tri‐band microstrip bandpass filter (BPF) with compact size and high selectivity is presented by using the stub‐loaded resonator (SLR) quarter‐wavelength stepped‐impedance (SIR). The SIR designed for first third passband SLR mainly controls second performance, so three frequencies can be flexibly tuned. Because of intrinsic characteristics resonators source‐load coupling, multiple transmission zeros created to improve selectivity. Finally, a BPF prototype located at 0.98 GHz (FRID application), 3.6 (Wimax 5.8 (WLAN application) designed. Measurement results agree well full‐wave EM simulated results. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:212–215, 2013; View this article online wileyonlinelibrary.com. DOI 10.1002/mop.27247