Compact tri‐band BPF applying novel multi‐mode microstrip resonator. Issue 6 (28th April 2016)

• Record Type: Journal Article
• Authors: Chen, Jianzhong; Wu, Zixian; Shi, Hongyu; Lin, Lei
• Is Part Of: International journal of RF and microwave computer-aided engineering. Volume 26:Issue 6(2016)
• Page Start: 559
• Page End: 564
• Publication Date: 2016-04-28
• Subjects: bandpass filter (BPF) -- even‐odd‐mode method -- mulit‐mode microstrip resonator -- tri‐band; Microwave devices -- Computer-aided design -- Periodicals; Computer-aided engineering -- Periodicals; 621.3813
• DOI: 10.1002/mmce.21006
• Languages: English
• ISSNs: 1096-4290

Abstract

ABSTRACT: This article presents a novel multi‐mode microstrip resonator. Using the even‐odd‐mode method, its resonance characteristics are analyzed and the design graphs are given. Each mode equivalent circuit is a λ /4 stepped impedance resonator (SIR), so the proposed resonator has a compact size and the higher harmonics can be tuned in a wide range. Stub–stub coupling is introduced to split two identical modes and produce two transmission zeros (TZs). Then a tri‐band filter operating at 1.5, 2.4, and 3.8 GHz is designed using the proposed resonator. The three center frequencies and bandwidths can be independently controlled. By tuning the impedance and length ratios of the stubs, wide upper stopband is achieved. Finally, the designed filter is fabricated and measured, and the measured results agree well with the simulated ones. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:559–564, 2016.