Compact, broad-stopband elliptic-function lowpass filters using microstrip stepped impedance hairpin resonators

Author

Lung-Hwa Hsieh ; Kai Chang

Author_Institution

Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA

Volume

3

fYear

2003

Firstpage

1775

Abstract

A compact elliptic-function lowpass filter is developed. Multiple cascaded microstrip hairpin resonators operated at different 3-dB cutoff frequencies are used to design the filter. The filters are evaluated by experiment and simulation with good agreement. The return loss is better than 12.84 dB from DC to 0.81 GHz. The insertion loss is less than 0.5 dB. The rejection is greater than 35.7 dB from 1.5 to 10 GHz. This compact, low loss, sharp cutoff frequency response, and broad stopband lowpass filter should be useful in many wireless communication systems.

Keywords

elliptic filters; losses; low-pass filters; microstrip filters; microstrip resonators; 0 to 0.81 GHz; 1.5 to 10 GHz; 12.84 dB; 3-dB cutoff frequencies; broad-stopband filters; elliptic-function lowpass filters; insertion loss; microstrip stepped impedance hairpin resonators; return loss; wireless communication systems; Capacitance; Cutoff frequency; Equivalent circuits; Fabrication; Impedance; Insertion loss; Microstrip filters; Microstrip resonators; Resonator filters; Transmission line matrix methods;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2003 IEEE MTT-S International

Conference_Location

Philadelphia, PA, USA

ISSN

0149-645X

Print_ISBN

0-7803-7695-1

Type

conf

DOI

10.1109/MWSYM.2003.1210484

Filename

1210484