Tapped wiggly-coupled technique applied to microstrip bandpass filters for multi-octave spurious suppression

Author

Chang, Sheng-Fuh ; Jeng, Yng-Huey ; Chen, Jia-Liang

Author_Institution

Dept. of Electr. Eng., Nat. Chung Cheng Univ., Ming-Hsiung, Taiwan

Volume

40

Issue

1

fYear

2004

Firstpage

46

Lastpage

47

Abstract

A tapped wiggly-coupled technique is applied to parallel-coupled microstrip bandpass filters for multi-octave out-of-band spurious suppression. The coupled edges of tapped microstrip resonators are wiggled to equalise the odd-mode and even-mode phase velocities such that the nearest two spurious harmonics can be eliminated. The simulation and experiment show that both the second and the third spurious level are reduced below 42 dB up to 9 GHz for a 2.45 GHz and 5.7% bandwidth bandpass filter.

Keywords

Chebyshev filters; UHF filters; band-pass filters; frequency response; harmonics suppression; microstrip couplers; microstrip filters; microstrip resonators; resonator filters; 2.45 GHz; EM simulation; even-mode phase velocities; frequency response; microstrip bandpass filters; multi-octave spurious suppression; odd-mode phase velocities; parallel-coupled microstrip filters; spurious harmonies; tapped microstrip resonators; tapped wiggly-coupled technique; third-order Chebyshev filter; wiggle depth; wiggle pitch;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20040053

Filename

1260668