A Novel Dual-Band Bandpass Filter With Closely Spaced Passbands

Author

Dong Chen ; Lei Zhu ; Chonghu Cheng

Author_Institution

Sch. of Electron. Sci. & Eng., Nanjing Univ. of Posts & Telecommun., Nanjing, China

Volume

24

Issue

1

fYear

2014

fDate

Jan. 2014

Firstpage

38

Lastpage

40

Abstract

This letter proposes a double-slot-loaded resonator for exploration of a novel dual-band bandpass filter with two closely spaced passbands. A small ratio of dual-passband central frequencies is realized by positioning the double slot stubs in an offset way. The first-passband fractional bandwidth can be properly tuned by a distance between the two slots, while the second one is determined by attaching a microstrip open-circuited stub at center. After the principle of this initial filter is described, a prototype filter is designed and fabricated. Measured results satisfactorily validate the predicted ones of the proposed filter.

Keywords

band-pass filters; microstrip filters; microstrip resonators; closely spaced passbands; double slot loaded resonator; double slot stubs; dual band bandpass filter; first passband fractional bandwidth; microstrip open circuited stub; prototype filter; Band-pass filters; Bandwidth; Dual band; Microstrip; Passband; Resonant frequency; Wireless communication; Bandpass filter (BPF); double-slot-loaded resonator (DSLR); dual-passband;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2013.2288277

Filename

6658962