New Microstrip Cascaded-Quadruplet Bandpass Filter Based on Connected Couplings and Short-Ended Parallel-Coupled Line

Author

Shih-Cheng Lin

Author_Institution

Dept. of Electr. Eng., Nat. Chiayi Univ., Chiayi, Taiwan

Volume

24

Issue

1

fYear

2014

fDate

Jan. 2014

Firstpage

2

Lastpage

4

Abstract

A cascaded-quadruplet (CQ) bandpass filter (BPF) using quarter-wave resonators is proposed based on connected couplings and short-ended parallel-coupled line (SE-PCL). The two distinct coupling mechanisms are well-characterized and employed to implement the main couplings and out-of-phase cross coupling among the CQ filter topology. Analytic design formulas with great simplicity are developed. Specifically, a microstrip CQ filter centering at 1.5 GHz with a fractional bandwidth of 10% is designed and implemented for demonstration. The measured results coincide well with the simulated ones thus validate the feasibility of the design approach.

Keywords

UHF filters; band-pass filters; microstrip filters; CQ BPF; CQ filter topology; SE-PCL; analytic design formulas; connected couplings; design approach; frequency 1.5 GHz; microstrip CQ filter; microstrip cascaded-quadruplet bandpass filter; out-of-phase cross coupling; quarter-wave resonators; short-ended parallel-coupled line; Band-pass filters; Bandwidth; Couplings; Equivalent circuits; Inverters; Joining processes; Microstrip; Bandpass filter (BPF); cascaded quadruplet (CQ); connected coupling; parallel-coupled line; transmission zero;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2013.2285226

Filename

6649985