Compact Bandpass Filter With Two Tunable Transmission Zeros Using Hybrid Resonators

Author

Bin-Feng Zong ; Guang-Ming Wang ; Jian-Gang Liang ; Cheng Zhou

Author_Institution

Lab. of Microwave Technol. & Applic., Air Force Eng. Univ., Xi´an, China

Volume

25

Issue

2

fYear

2015

fDate

Feb. 2015

Firstpage

88

Lastpage

90

Abstract

This letter presents a novel type of compact, low insertion loss (IL) planar microstrip filter, which is mainly composed of two hybrid resonators with a mixed electric/magnetic (EM) coupling between them. Tunable EM coupling is constructed to realize a tunable transmission zero (TZ) very close to the passband. And two folded T-shaped feed lines are adopted to introduce another tunable TZ and obtain a desired external coupling. Advantages of the proposed filter are not only its compact size and low IL, but also its tunable TZs.

Keywords

band-pass filters; electromagnetic coupling; microstrip filters; microstrip lines; resonator filters; compact IL planar microstrip filter; compact bandpass filter; folded T-shaped feed lines; hybrid resonators; low insertion loss; mixed electricmagnetic coupling; tunable EM coupling; tunable TZ; tunable transmission zeros; Band-pass filters; Couplings; Feeds; Filtering theory; Integrated circuit modeling; Resonator filters; Wireless communication; Bandpass filter (BPF); circuit model; hybrid resonator; tunable transmission zeros;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2014.2382673

Filename

7012125