Ultra-Wideband (UWB) Ring Resonator Bandpass Filter With a Notched Band

Author

Kim, Chan Ho ; Chang, Kai

Author_Institution

Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX, USA

Volume

21

Issue

4

fYear

2011

fDate

4/1/2011 12:00:00 AM

Firstpage

206

Lastpage

208

Abstract

This letter presents a novel ultra-wideband (UWB) bandpass filter (BPF) with a notched band using a ring resonator. Bandwidths of the ring resonator with two stepped-impedance stubs are calculated by examining the relations between resonant frequencies and the characteristic impedance of the ring. Stepped-impedance ports are used to obtain improved return losses in a high-frequency band. Interdigital-coupled feed lines with an asymmetric structure embedded in the stepped-impedance ports are developed to avoid wireless local-area network (WLAN) signals at 5 GHz band. Measured results show that 3 dB fractional bandwidths (FBWs) are 102.8% and 103.3% with and without the notched band, respectively. Measured insertion loss of the notched band within the UWB is 11.14 dB at 5.41 GHz.

Keywords

band-pass filters; resonators; ultra wideband technology; wireless LAN; characteristic impedance; frequency 5 GHz; frequency 5.41 GHz; interdigital-coupled feed line; loss 11.14 dB; notched band; stepped-impedance port; stepped-impedance stub; ultra-wideband ring resonator bandpass filter; wireless local area network signal; Band pass filters; Bandwidth; Feeds; Optical ring resonators; Passband; Resonant frequency; Wireless communication; Bandpass filter (BPF); ring resonator; ultra-wideband (UWB);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2011.2109942

Filename

5729347