DocumentCode :
927867
Title :
A novel self-coupled dual-mode ring resonator and its applications to bandpass filters
Author :
Jeng, Yng-Huey ; Chang, Sheng-Fuh R. ; Chen, Yi-Ming ; Huang, Yu-Jen
Author_Institution :
Dept. of Electr. Eng., Nat. Chung Cheng Univ., Taiwan
Volume :
54
Issue :
5
fYear :
2006
fDate :
5/1/2006 12:00:00 AM
Firstpage :
2146
Lastpage :
2152
Abstract :
A novel dual-mode ring resonator with self-coupled segments, called a self-coupled ring resonator, is proposed. The self-coupling between ring segments provides the same mode perturbation effect as the conventional methods of adding stub, cutting notch, or varying line impedance on the ring resonator. The mode perturbation and transmission-zero generation due to the self-coupling effect are analyzed with the even-odd mode theory. The self-coupled ring resonator can have the capacitive or inductive perturbation simply by controlling the impedance ratio and coupling coefficients of self-coupled sections. For both perturbation cases, the transmission zeros exist at even multiples of the passband center frequency, resulting in wide stopband range. Also, only for the capacitive perturbation case, two transmission zeros are found on both sides of the passband, which brings a pseudo-elliptic bandpass response. In comparison with the regular uniform ring resonator, the self-coupled ring resonator takes shorter ring length, giving the compact size feature when applied to a bandpass filter design. A 2.45-GHz low-temperature co-fired ceramic bandpass filter based on the self-coupled ring resonator was designed to verify the proposed theory.
Keywords :
UHF filters; band-pass filters; crystal filters; perturbation techniques; poles and zeros; resonator filters; 2.45 GHz; capacitive perturbation; dual-mode ring resonators; inductive perturbation; low temperature cofired ceramic bandpass filters; self-coupled ring resonator; transmission-zero generation; Band pass filters; Ceramics; Coupling circuits; Filtering theory; Impedance; Optical ring resonators; Passband; Resonance; Resonant frequency; Resonator filters; Bandpass filter; dual mode; even–odd mode; perturbation; self-coupled;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2006.873632
Filename :
1629057
Link To Document :
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