Bandpass Filter Loaded With Open Stubs Using Dual-mode Ring Resonator

Author

Wenjie Feng ; Xin Gao ; Wenquan Che ; Quan Xue

Author_Institution

Dept. of Commun. Eng., Nanjing Univ. of Sci. & Technol., Nanjing, China

Volume

25

Issue

5

fYear

2015

fDate

5/1/2015 12:00:00 AM

Firstpage

295

Lastpage

297

Abstract

A high selectivity bandpass filter loaded with open stubs using dual-mode ring resonator is presented in this letter. Sixth-order passband with six transmission zeros close to the passband is realized with two open stubs and open/shorted coupled lines. The transmission zeros near the passband can be adjusted conveniently by only changing the characteristic impedances of the coupled lines. For demonstration, a planar bandpass filter (3 dB bandwidth 20.6%) is designed and fabricated. Good filtering performance and high selectivity for the filter are realized and experimentally verified.

Keywords

band-pass filters; coupled transmission lines; resonator filters; dual-mode ring resonator; high selectivity bandpass filter; open stubs; open-shorted coupled lines; six transmission zeros; sixth-order passband; Band-pass filters; Bandwidth; Filtering theory; Microstrip; Microwave filters; Optical ring resonators; Passband; Coupled lines; dual-mode; ring resonator; stubs; transmission zeros;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2015.2410174

Filename

7081387