Design of a Substrate Integrated Waveguide Balun Filter Based on Three-Port Coupled-Resonator Circuit Model

Author

Wu, Lin-Sheng ; Guo, Yong-Xin ; Mao, Jun-Fa ; Yin, Wen-Yan

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore

Volume

21

Issue

5

fYear

2011

fDate

5/1/2011 12:00:00 AM

Firstpage

252

Lastpage

254

Abstract

A novel balun filter is proposed using the substrate integrated waveguide (SIW) technique, which is designed with a three-port coupled-resonator circuit model. Considering the loading effect of other resonators, a modified balanced resonant mode in a higher-order SIW cavity is utilized to provide both a negative cross-coupling and the conversion from an unbalanced signal to a balanced one. Our developed balun filter has good frequency selectivity, and the balance of amplitude and phase between two outputs is also achieved, which is demonstrated by good agreement between its simulated and measured results.

Keywords

baluns; multiport networks; resonator filters; substrate integrated waveguides; frequency selectivity; loading effect; modified balanced resonant mode; negative cross-coupling; substrate integrated waveguide balun filter; three-port coupled-resonator circuit model; Cavity resonators; Couplings; Filtering theory; Impedance matching; Integrated circuit modeling; Load modeling; Substrates; Balun filter; coupled-resonator circuit model; substrate integrated waveguide (SIW); three-port;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2011.2116776

Filename

5739127