A Microstrip Two-layer Dual-Passband Filter Using Aperture-Coupled SIRs with Wide Rejection Bandwidth by Defected Ground Structure (DGS)

Author

Promprathom, Sutatom ; Chaimool, Sarawuth ; Akkaraekthalin, Prayoot

Author_Institution

Dept. of Electr. Eng., King Mongkut´´s Inst. of Technol., Bangkok

fYear

2007

fDate

11-14 Dec. 2007

Firstpage

1

Lastpage

4

Abstract

A compact microstrip two-layer dual-passband filter using aperture-coupled stepped-impedance resonators with wide rejection bandwidth by defected ground structure (DGS) is proposed. To validate the proposed design, a four-order of the dual-band bandpass filter was designed, fabricated, and measured to operate at WLAN 2.4 and 5.2 GHz. DGSs are placed under feed lines for extra stopband rejection mode to spurious frequencies of the filter with attenuation losses over than -15 dB, without affecting the operation bands and insertion losses of the originally designed filter. The proposed filter is not only compact in size due to two-layer configuration , but also has a wider upper stopband resulting from the DGSs effect. The experimental results of the fabricated filter agree very well with simulation expectations.

Keywords

band-pass filters; band-stop filters; microstrip filters; resonator filters; wireless LAN; WLAN; aperture-coupled SIR; aperture-coupled stepped-impedance resonators; defected ground structure; dual-band bandpass filter; microstrip two-layer dual-passband filter; spurious frequency; stopband rejection mode; wide rejection bandwidth; Attenuation; Band pass filters; Bandwidth; Dual band; Feeds; Frequency; Microstrip filters; Microstrip resonators; Resonator filters; Wireless LAN; DGS; SIR; Two-layer dual-passband; stopband;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2007. APMC 2007. Asia-Pacific

Conference_Location

Bangkok

Print_ISBN

978-1-4244-0748-4

Electronic_ISBN

978-1-4244-0749-1

Type

conf

DOI

10.1109/APMC.2007.4555020

Filename

4555020