Short-Ended Self-Coupled Ring Resonator and Its Application for Balanced Filter Design

Author

Hui Wang ; Kam-Weng Tam ; Sut-Kam Ho ; Wei Kang ; Wen Wu

Author_Institution

Ministerial Key Lab., Nanjing Univ. of Sci. & Technol., Nanjing, China

Volume

24

Issue

5

fYear

2014

fDate

May-14

Firstpage

312

Lastpage

314

Abstract

Theory and applications of short-ended self-coupled ring resonator (SCRR) are focused in this letter. By periodically and symmetrically placing short-ended SCRRs between the microstrip differential lines, the common-mode (CM) suppression can be achieved at desired frequency easily with wideband unaffected differential-mode (DM) passband. On the basis of controllable center frequency of CM suppression and cut frequency of DM passband by means of self-coupled coefficient, differential lines with SCRRs and a balanced bandpass filter (BPF) are designed at 2.4 GHz. Due to the effects of the proposed short-ended SCRRs, the balanced BPF exhibits more than 60 dB of maximum CM rejection within the DM passband. The simulated and measured results are in good agreement.

Keywords

UHF circuits; UHF filters; band-pass filters; microstrip lines; network synthesis; resonator filters; BPF; CM suppression; DM passband filter; balanced bandpass filter design; common-mode suppression; frequency 2.4 GHz; maximum CM rejection; microstrip differential line; self-coupled coefficient; short-ended self-coupled ring resonator; symmetrically placing short-ended SCRR; wideband unaffected differential-mode passband filter; Band-pass filters; Microstrip; Optical ring resonators; Passband; Resonant frequency; Wideband; Wireless communication; Balanced bandpass filter (BPF); common-mode (CM) rejection; self-coupled ring resonator;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2014.2309081

Filename

6774960