Design of Wide Passband/Stopband Microstrip Bandpass Filters With the Stepped Coupled Line

Author

Ching-Wen Tang ; Chien-Tai Tseng ; Shun-Hsing Chiu ; Po-Hsien Wu

Author_Institution

Dept. of Commun. Eng. & the Dept. of Electr. Eng., Nat. Chung Cheng Univ., Chiayi, Taiwan

Volume

61

Issue

3

fYear

2013

fDate

Mar-13

Firstpage

1095

Lastpage

1103

Abstract

Novel wide passband microstrip bandpass filters with broader stopbands are provided in this paper. The proposed bandpass filters are composed of the stepped coupled line and two short-circuited stubs. The electrical length of the stepped coupled line is a quarter of wavelength so that the proposed filter is compact size. Moreover, the stepped coupled line with weak-strong-weak coupling results in a wide stopband. Furthermore, with short-circuited stubs connected at the input/output port, there is a steeper passband skirt and broader passband. In addition, the agreement between theoretical prediction and measurement validates our proposed structure.

Keywords

band-pass filters; band-stop filters; microstrip filters; broader pass-band; broader stopbands; compact size filter; electrical length; input-output port; measurement validation; short-circuited stubs; shortcircuited stubs; steeper pass-band skirt; stepped coupled line; weak-strong-weak coupling; wide passband-stopband microstrip bandpass filters design; Couplings; Filtering theory; Harmonic analysis; Microstrip; Microstrip filters; Passband; Power harmonic filters; Microstrip bandpass filter; stepped coupled line; wide passband filter; wide stopband filter;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2013.2244227

Filename

6463468