Open AccessDESIGN OF TRIPLE-BANDPASS FILTERS USING AN ASYMMETRIC STEPPED-IMPEDANCE RING RESONATOR
Author(s) -
Wensong Wang,
You Li,
Qunsheng Cao,
Shuhui Yang,
Yinchao Chen
Publication year - 2017
Publication title -
progress in electromagnetics research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.245
H-Index - 33
ISSN - 1937-6480
DOI - 10.2528/pierl17011605
Subject(s) - band pass filter , resonator , ring (chemistry) , electrical impedance , materials science , helical resonator , split ring resonator , electronic engineering , acoustics , optoelectronics , physics , electrical engineering , engineering , chemistry , organic chemistry
An asymmetric stepped-impedance ring resonator (ASIRR) is proposed for the design of a triple-bandpass filter. This resonator is applied to create the former two passbands by utilizing a stepped-impedance circular ring and the third passband by introducing two asymmetric coupling structures. It is found that the S-parameter performance can be improved by adding a pair of shorted and open stubs, and the second passband and the stopbands on both sides of the third passband can be tuned by adjusting the length of open stubs. A prototype filter operating at 1.04, 3.52 and 5.57 GHz is designed, fabricated, and measured with the corresponding fractional bandwidths of 23.1%, 7.4%, and 4.1%. Good agreements between the simulated and measured results are achieved for the ASIRR filter. Also, four transmission zeros are generated.
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