Design of Substrate Integrated Waveguide Transversal Filter With High Selectivity

Author

Li, Rongqiang ; Tang, Xiaohong ; Xiao, Fei

Author_Institution

Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China (UESTC), Chengdu, China

Volume

20

Issue

6

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

328

Lastpage

330

Abstract

A substrate integrated waveguide (SIW) transversal bandpass filter (BPF) using Modified Doublet (MD) with high selectivity is presented in this letter. The modified doublet contains two resonators that are not coupled to each other. However, the source and the load are directly coupled in order to generate two transmission zeros. By changing the sign of one coupling coefficient and detuning the resonators in the modified doublet, two transmission zeros can be simultaneously placed below or above the passband, or one can be placed below and the other above the passband. In addition, a dedicated input and output SIW are used to suppress the lower mode for maximum selectivity. A second-order 14.87 GHz transversal BPF with 130 MHz bandwidth is designed, fabricated and measured. The measured result confirms the theoretical prediction, and validates the new structure for high-selectivity applications.

Keywords

band-pass filters; resonators; substrate integrated waveguides; transversal filters; BPF Design; SIW transversal filter; bandwidth 130 MHz; coupling coefficient; frequency 14.87 GHz; high-selectivity applications; modified doublet; resonators; substrate integrated waveguide; transmission zeros; transversal bandpass filter design; Bandpass filters (BPF); substrate integrated waveguide (SIW); transmission zeros; transversal filters;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2010.2047518

Filename

5454352