An Ultra-Wideband Bandpass Filter With an Embedded Open-Circuited Stub Structure to Improve In-Band Performance

Author

Weng, Min-Hang ; Liauh, Chihng-Tsung ; Wu, Hung-Wei ; Vargas, Steve Ramrez

Author_Institution

Med. Devices & Opto-Electron. Equip. Dept., Metal Ind. Res. & Dev. Center, Taipei

Volume

19

Issue

3

fYear

2009

fDate

3/1/2009 12:00:00 AM

Firstpage

146

Lastpage

148

Abstract

In this letter, we present a compact ultra-wideband bandpass filter (BPF) with a notch band in the BPF performance by using an embedded open-circuited stub structure. The filter mainly consists of conventional stepped impedance resonator (SIR) as the multiple-mode resonator and two enhanced coupled input/output lines. The bandwidth can be analyzed by using the image-parameter method to obtain the proper dimension of the coupled lines and verified by using electromagnetic (EM) simulation. The embedded open-circuited stub structure in the SIR is used to produce a narrow notched band at 5.8 GHz, which its frequency position and bandwidth can be tuned by its physical parameters. The measured 3 dB fractional bandwidth of 113.8% and narrow notched band with 25 dB rejection is achieved. Good agreement between the EM simulation and measurement is obtained.

Keywords

band-pass filters; resonator filters; ultra wideband communication; electromagnetic simulation; embedded open circuited stub structure; fractional bandwidth; frequency 5.8 GHz; frequency position; in-band performance; physical parameters; stepped impedance resonator; ultrawideband bandpass filter; Bandpass filter (BPF); notched band; open-circuited stub; ultra-wideband (UWB);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2009.2013733

Filename

4796231