Wideband Microstrip Bandpass Filter Based on Quadruple Mode Ring Resonator

Author

Fan, Jin ; Zhan, Dezhi ; Jin, Chengjin ; Luo, Jirun

Author_Institution

Dept. of FAST, Nat. Astron. Obs. of China, Beijing, China

Volume

22

Issue

7

fYear

2012

fDate

7/1/2012 12:00:00 AM

Firstpage

348

Lastpage

350

Abstract

A novel wideband microstrip band-pass filter is presented in this letter based on a quadruple-mode ring resonator, which is developed by introducing a stepped-impedance one-wavelength ring resonator (SORR) into a stepped-impedance half-wavelength resonator (SHR). In order to suppress the harmonic responses of the filter for a wide stop-band, two band-stop sections with asymmetrical -type structure are introduced. A prototype filter having 49.3% of 1 dB and 57.9% of 3 dB fractional bandwidth is fabricated with advantages of high selectivity and high out-of-band rejection. In the pass-band, the return loss is larger than 18.8 dB and at the centre frequency insertion loss is 0.6 dB. The experiments are in good agreement with the simulations.

Keywords

band-pass filters; band-stop filters; harmonics suppression; microstrip filters; resonator filters; SHR; SORR; asymmetrical-type structure; band-stop filter; centre frequency insertion loss; harmonic response suppression; high out-of-band rejection; loss 0.6 dB; quadruple mode ring resonator; return loss; stepped-impedance half-wavelength resonator; stepped-impedance one-wavelength ring resonator; wideband microstrip bandpass filter; Band pass filters; Filtering theory; Insertion loss; Optical ring resonators; Resonant frequency; Wideband; Quadruple-mode ring resonator; stepped impedance resonator (SIR); wideband band-pass filter (BPF);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2012.2199977

Filename

6204202