Miniaturised microstrip dual-band bandpass filter using novel symmetric double-spiral resonators for WLAN application

Author

Guo-cheng Wu ; Guangming Wang ; Jiang Gang Liang ; Xiang-jun Gao ; Li Zhu

Author_Institution

Air-Defense & Antimissile Inst., Air Force Eng. Univ., Xi´an, China

Volume

51

Issue

15

fYear

2015

fDate

7 23 2015

Firstpage

1177

Lastpage

1178

Abstract

A miniaturised dual-band bandpass filter (DB-BPF) centred at 2.45/5.70 GHz using novel symmetric double-spiral resonators is proposed. The measured and simulated results of the proposed DB-BPF are in good agreement with each other except for a slight frequency shift downwards in the measurement. According to the measurements, the measured 3 dB bandwidths are 6.53% (2.35-2.51 GHz) at 2.45 GHz and 4.2% (5.61-5.85 GHz) at 5.70 GHz; the insertion losses including the loss from SMA connectors are <;0.8/1.2 dB and the isolation between these two passbands is better than 20 dB from 2.54 to 5.59 GHz. The circuit area of the fabricated prototype is very compact, being only 7.7 × 9.4 mm.

Keywords

UHF filters; band-pass filters; electric connectors; microstrip filters; microwave filters; resonator filters; DB-BPF; SMA connector; WLAN application; bandwidth 2.35 GHz to 2.51 GHz; bandwidth 5.61 GHz to 5.85 GHz; frequency 2.45 GHz; frequency 2.54 GHz to 5.59 GHz; gain 3 dB; miniaturised microstrip dual-band bandpass filter; symmetric double-spiral resonator;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2015.1690

Filename

7163395