Balanced dual-band BPF with intrinsic common-mode suppression on double-layer substrate

Author

Kai Wang ; Lei Zhu ; Sai-Wai Wong ; Dong Chen ; Zai-Cheng Guo

Author_Institution

Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China

Volume

51

Issue

9

fYear

2015

fDate

4 30 2015

Firstpage

705

Lastpage

707

Abstract

A balanced dual-band bandpass filter (BPF) with enhanced common-mode (CM) suppression is proposed. The dual-band differential-mode (DM) bandpass response is obtained using a double-layer substrate. The stub-loaded stepped-impedance resonators are used both in the top and the bottom layers to constitute a dual-band BPF with two controllable passbands. The slotline portion in the middle layer is excited under DM operation. Moreover, the even-symmetrical field along the slotline is highly attenuated under CM excitation, thus achieving excellent CM suppression over the desired DM passbands. To verify the proposed concept, a balanced dual-band BPF, operating at 1.9 and 2.8 GHz, is designed and fabricated, and the simulated and measured results are in good agreement.

Keywords

band-pass filters; resonator filters; CM; DM; SIR; balanced dual-band BPF; balanced dual-band bandpass filter; double-layer substrate; dual-band differential-mode bandpass response; enhanced common-mode suppression; frequency 1.9 GHz; frequency 2.8 GHz; intrinsic common-mode suppression; slotline portion; stub-loaded stepped-impedance resonator;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2015.0327

Filename

7095670