Compact Balanced Dual- and Tri-band Bandpass Filters Based on Stub Loaded Resonators

Author

Feng Wei ; Guo, Y. Jay ; Pei-Yuan Qin ; Xiao Wei Shi

Author_Institution

Sci. & Technol. on Antenna & Microwave Lab., Xidian Univ., Xi´an, China

Volume

25

Issue

2

fYear

2015

fDate

Feb. 2015

Firstpage

76

Lastpage

78

Abstract

A stub loaded resonator (SLR) is presented in this letter, which can achieve dual-band or tri-band differential-mode (DM) bandpass response with a high common-mode (CM) suppression. By changing the length of the center-loaded stub, the resonant frequency of the CM can be varied without affecting that of the DM. This helps in simplifying the design and tuning processes of the balanced filters. In order to validate its practicalbility, two balanced bandpass filters (BPFs) with two and three DM passbands and good CM suppression are designed. Good agreement between simulated and measured results is observed. To our best knowledge, the proposed balanced tri-band BPF is the first ever reported.

Keywords

band-pass filters; circuit tuning; resonator filters; CM suppression; DM bandpass response; SLR; balanced filter design; balanced filter tuning process; balanced tri-band BPF; center-loaded stub; compact balanced dual-band bandpass filters; high common-mode suppression; resonant frequency; stub loaded resonators; tri-band bandpass filters; tri-band differential-mode bandpass response; Band-pass filters; Bandwidth; Dual band; Loss measurement; Passband; Resonant frequency; Wireless communication; Balanced bandpass filter (BPF); common-mode (CM); differential mode (DM); stub loaded resonator (SLR); tri-band;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2014.2370233

Filename

6960916