Tri-Band Bandpass Filter With Sharp Passband Skirts Designed Using Tri-Section SIRs

Author

Hsu, Chung-I G. ; Lee, Ching-Her ; Hsieh, Yi-Huan

Author_Institution

Da-Yeh Univ., Changhua

Volume

18

Issue

1

fYear

2008

Firstpage

19

Lastpage

21

Abstract

This letter presents a second-order tri-band bandpass filter (BPF) designed using tri-section stepped-impedance resonators (TSSIRs). The impedance ratios of the TSSIRs were computed using the formulas expressed as functions of the passband center frequencies, which are located at 1.57, 2.45, and 3.5 GHz. A cross-coupled configuration was arranged to sharpen the passband skirts. The newly designed tri-band BPF was verified by circuit implementation and very good agreement between the simulated and measured results was observed.

Keywords

UHF filters; band-pass filters; microstrip filters; microwave filters; transceivers; frequency 1.57 GHz; frequency 2.45 GHz; frequency 3.5 GHz; multiband multimode wireless-communication systems; sharp passband skirts; tri-band bandpass filter; tri-section stepped-impedance resonators; Band pass filters; Circuit simulation; Computational modeling; Global Positioning System; Impedance; Microstrip filters; Microstrip resonators; Passband; Resonant frequency; Transceivers; Tri-band microstrip bandpass filter (BPF); tri-section stepped-impedance resonator (TSSIR);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2007.911976

Filename

4407750