Compact microstrip low-pass filter with sharp rejection

Author

Tu, Wen-Hua ; Chang, Kai

Author_Institution

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

Volume

15

Issue

6

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

404

Lastpage

406

Abstract

This letter presents a compact multisection sharp-rejection microstrip low-pass filter. Each section consists of a microstrip line section and an interdigital capacitor. The analysis for optimizing the attenuation poles by adjusting the finger number, and the width and length of the microstrip line section, is presented. The cascaded four-section low-pass filter has a return loss of better than 17 dB and an insertion loss of less than 0.7 dB from DC to 1.6 GHz. The rejection is better than 20 dB from 2.1 to 7.5 GHz.

Keywords

circuit optimisation; low-pass filters; microstrip filters; poles and zeros; 0 Hz to 1.6 GHz; 0.7 dB; 17 dB; 2.1 to 7.5 GHz; attenuation poles optimization; cascaded multisection filter; compact multisection microstrip filter; finger number adjustment; interdigital capacitor; line section length; microstrip line section width; microstrip low-pass filter; sharp rejection filter; Attenuation; Band pass filters; Capacitance; Capacitors; Cutoff frequency; Fingers; Low pass filters; Microstrip filters; Passband; Resonator filters; Interdigital capacitor; low-pass filter; sharp rejection;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2005.850479

Filename

1435438