A Tri-Band Bandpass Filter With Wide Stopband Using Asymmetric Stub-Loaded Resonators

Author

Siang-Wen Lan ; Min-Hang Weng ; Shoou-Jinn Chang ; Cheng-Yuan Hung ; Shih-Kun Liu

Author_Institution

Inst. of Microelectron. & Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan

Volume

25

Issue

1

fYear

2015

fDate

Jan. 2015

Firstpage

19

Lastpage

21

Abstract

This letter presents a tri-band bandpass filter (BPF) with a wide stopband using asymmetric stub-loaded resonators (ASLR). A tri-band filter sample was fabricated by using two ASLRs with coupled I/O ports. By properly tuning the electrical length ratios of the ASLRs ( α and γ), three passbands can be designed at 1.4, 2.4, and 3.5 GHz. The harmonic responses are suppressed effectively by forming an uncoupled section at the end of the ASLRs, and the stopband region is formed from 3.7 to 7 GHz with a rejection level of 30 dB. The measured results of the fabricated tri-band BPF exhibit good agreement with simulated results.

Keywords

band-pass filters; band-stop filters; resonator filters; ASLR; BPF; asymmetric stub-loaded resonators; frequency 1.4 GHz; frequency 2.4 GHz; frequency 3.5 GHz; frequency 3.7 GHz to 7 GHz; triband bandpass filter; wide stopband; Band-pass filters; Bandwidth; Couplings; Microstrip; Passband; Resonant frequency; Wireless communication; Asymmetric stub-loaded resonator (ASLR); filter; resonant analysis; tri-band;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2014.2365739

Filename

6948284