A Dual-Mode Substrate Integrated Waveguide Filter With Controllable Transmission Zeros

Author

Fei Cheng ; Xian Qi Lin ; Lancaster, Michael ; Kaijun Song ; Yong Fan

Author_Institution

EHF Key Lab. of Fundamental Sci., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

25

Issue

9

fYear

2015

Firstpage

576

Lastpage

578

Abstract

In this letter, a circular dual-mode substrate integrated waveguide (SIW) filter with two controllable transmission zeros is proposed. Two vias situated on a diameter line are employed to perturb two modes in a circular substrate integrated waveguide resonator. Taking advantage of the modal orthogonality of multiple cavity modes, transmission zeros are created. By moving the vias along the diameter line, the transmission zeros can be adjusted. The coupling matrix is employed to analyze the design concept. A three-pole filter with the center frequency at 8 GHz and two transmission zeros at 8.6 and 9.2 GHz is designed and fabricated. Experimental and simulated results are presented which validate the design concept of the proposed filter.

Keywords

coupled circuits; microwave filters; poles and zeros; resonator filters; substrate integrated waveguides; SIW filter; circular substrate integrated waveguide filter; circular substrate integrated waveguide resonator; controllable transmission zeros; coupling matrix; dual mode substrate integrated waveguide filter; frequency 8 GHz; frequency 8.6 GHz; frequency 9.2 GHz; modal orthogonality; multiple cavity modes; three-pole filter; Bandwidth; Cavity resonators; Couplings; Filtering theory; Microwave filters; Resonant frequency; Substrates; Dual-mode resonator; substrate integrated waveguide (SIW); transmission zero;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2015.2451362

Filename

7180416