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Compact tri‐band BPF applying novel multi‐mode microstrip resonator
Author(s) -
Chen Jianzhong,
Wu Zixian,
Shi Hongyu,
Lin Lei
Publication year - 2016
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21006
Subject(s) - resonator , stub (electronics) , stopband , microstrip , helical resonator , electrical impedance , acoustics , harmonics , microwave , physics , dielectric resonator antenna , electronic engineering , distributed element filter , passband , center frequency , band pass filter , materials science , optoelectronics , filter (signal processing) , electrical engineering , engineering , telecommunications , low pass filter , prototype filter , voltage
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.