Tri-section stepped-impedance resonators for design of dual-band bandstop filter

Author

Lung, Chih-Kang ; Chin, Kuo-Sheng ; Fu, Jeffrey S.

Author_Institution

Dept. of Electron. Eng., Chang Gung Univ., Taoyuan, Taiwan

fYear

2009

fDate

Sept. 29 2009-Oct. 1 2009

Firstpage

771

Lastpage

774

Abstract

In this paper, we present the dual-band bandstop filter design using tri-section stepped-impedance resonators. The proposed tri-section stepped-impedance resonator has the features of dual-band and size reduction due to its nonuniform impedance characteristic. There are two degrees of freedom in the proposed synthesis equations, which can be used for circuit miniaturization and changing impractical impedances into more realizable ones. An experimental bandstop filter was verified by circuit implementation. It showed good agreement between the simulated and measured results. Compared with the conventional parallel-connected λ/4 stubs, the proposed tri-section stepped-impedance structures can achieve more than 23.6% size reduction.

Keywords

band-stop filters; microwave filters; resonator filters; circuit miniaturization; degrees of freedom; dual-band bandstop filter design; microwave filter; nonuniform impedance characteristic; parallel-connected λ/4 stubs; size reduction; synthesis equations; trisection stepped-impedance resonator; Band pass filters; Circuit synthesis; Design engineering; Dual band; Equations; Frequency; Impedance; Lungs; Microwave filters; Resonator filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2009. EuMC 2009. European

Conference_Location

Rome

Print_ISBN

978-1-4244-4748-0

Type

conf

Filename

5296008