Design of dual-band bandpass filter using stub-loaded resonator with source-load coupling and spur-line at 2.45/5.5 GHz for WLAN applications

Author

Yu-Hung Lo ; Li-Ju Chen ; Ken-Huang Lin

Author_Institution

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

fYear

2014

fDate

4-6 Aug. 2014

Firstpage

193

Lastpage

194

Abstract

A microstrip-line dual-band bandpass filter using stub-loaded resonator (SLR) with good selectivity in first pass band and wide bandwidth in second pass band is proposed in this paper. By properly adjusting the gap between source-load and SLR, good return loss at lower frequencies can be achieved. To further improve the rejection level between the first pass band and second pass band, the spur-line in the coupled feeding line is etched to produce the another transmission zero at 4.3 GHz. Based on the proposed SLR, a dual-band bandpass filter with three transmission zeros is implemented. The upper stopband extends widely to 10.75 GHz to have good suppression below -20 dB.

Keywords

UHF filters; band-pass filters; microstrip filters; microwave filters; resonator filters; wireless LAN; WLAN applications; band-pass filter; dual band filter; feeding line; frequency 10.75 GHz; frequency 2.45 GHz; frequency 5.5 GHz; microstrip line filter; source load coupling; spur line; stub loaded resonator; Band-pass filters; Dual band; Filtering theory; Insertion loss; Microstrip filters; Resonant frequency; Resonator filters; bandpass filter(BPF); dual-band; spurline; stub-loaded resonator(SLR);

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetics (iWEM), 2014 IEEE International Workshop on

Conference_Location

Sapporo

Type

conf

DOI

10.1109/iWEM.2014.6963702

Filename

6963702