Very Compact Stacked LC Resonator-Based Bandpass Filters With a Novel Approach to Tune the Transmission Zeros

Author

Chen, Chien-Hsun ; Huang, Chien-Hsiang ; Horng, Tzyy-Sheng ; Wu, Sung-Mao ; Li, Jian-Yu ; Chen, Cheng-Chung ; Chiu, Chi-Tsung ; Hung, Chih-Pin

Author_Institution

Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung

Volume

19

Issue

5

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

293

Lastpage

295

Abstract

This letter presents very compact stacked LC resonator structures and their coupling and excitation techniques for designing the bandpass filters operating in the 3.5 GHz WiMAX band. Using a coupled stacked LC-resonator structure not only greatly reduces the overall size but also can create multiple transmission zeros to enhance roll-off rate or desired stopband rejection for the designed bandpass filters. Furthermore, this letter develops a simple technique of etching a rectangular C-shaped slot in the bottom ground plane to flexibly adjust the transmission-zero frequencies without changing the size and shape of the filter.

Keywords

WiMax; band-pass filters; microwave filters; poles and zeros; resonator filters; LC resonator-based bandpass filters; WiMAX; frequency 3.5 GHz; ground planes; rectangular C-shaped slot; roll-off rate; stopband rejection; transmission zeros; Bandpass filter (BPF); stacked LC resonator; transmission zeros;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2009.2017593

Filename

4840541