Compact and High Selectivity Tri-Band Bandpass Filter Using Multimode Stepped-Impedance Resonator

Author

Hai-Wen Liu ; Yan Wang ; Xiao-Mei Wang ; Jiu-Huai Lei ; Wen-Yuan Xu ; Yu-Long Zhao ; Bao-Ping Ren ; Xue-Hui Guan

Author_Institution

East China of Jiaotong Univ., Nanchang, China

Volume

23

Issue

10

fYear

2013

fDate

Oct. 2013

Firstpage

536

Lastpage

538

Abstract

In this letter, a miniaturized tri-band bandpass filter (BPF) using a multimode stepped-impedance resonator (SIR) with a 0 ^° tapped-feed structure is presented. The odd- and even-mode fundamental resonant frequencies and the first high-order resonant frequencies of the SIR are utilized to generate dual-mode dual-band response and the tapped side-coupled feed-lines construct an additional passband avoiding occupying extra size. Owing to the 0 ^° tapped-feed structure and the intrinsic characteristics of the SIR, multiple transmission zeros are created to improve the selectivity of the filter. The bands of the designed tri-band BPF are located at 1.57 GHz (GPS application), 3.5 GHz (WiMAX application) and 5.8 GHz (WLAN application). Good agreement between the simulated and the measured results is observed.

Keywords

Global Positioning System; UHF filters; UHF resonators; WiMax; band-pass filters; microwave filters; microwave resonators; poles and zeros; wireless LAN; BPF; GPS application; WLAN application; WiMAX application; dual-mode dual-band response generation; even-mode fundamental resonant frequencies; filter selectivity improvement; frequency 1.57 GHz; frequency 3.5 GHz; frequency 5.8 GHz; high selectivity triband bandpass filter; high-order resonant frequencies; intrinsic characteristics; miniaturized triband bandpass filter; multimode SIR; multimode stepped-impedance resonator; odd-mode fundamental resonant frequencies; tapped side-coupled feed-lines; tapped-feed structure; transmission zeros; Band pass filters; Bandwidth; Feeds; Filtering theory; Passband; Resonant frequency; Wireless communication; Bandpass filter (BPF); even-odd mode; high selectivity; stepped-impedance resonator (SIR); tri-band;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2013.2251618

Filename

6480895