New Dual-Mode Ring Bandpass Filter Using Symmetrical Left-Handed Transmission Line

Author

Srisathit, K. ; Jadpum, P. ; Bunnjaweht, S. ; Surakampontorn, W.

Author_Institution

Fac. of Eng. & Res. Center for Commun. & Inf. Technol., King Mongkut´´s Inst. of Technol. Ladkrabang, Bangkok

fYear

2007

fDate

11-14 Dec. 2007

Firstpage

1

Lastpage

4

Abstract

This paper presents a new dual-mode microstrip ring bandpass filter (BPF) based on the left-handed transmission line (LH-TL). To achieve dual-mode response, a high impedance LH-TL can easily be realized to perturb a pair of degenerate modes, which difficulty is realized in the conventional dual-mode ring filter. The proposed BPF is designed and fabricated on an FR-4 substrate to suit the 2.45 GHz ISM band application with a fractional bandwidth of 16.2 percentages. Across the bandwidth, the measured insertion loss is less than 1.5 dB, whereas the input and output return losses are better than 20 dB from 2.37 to 2.59 GHz. The measured results are in good agreement with the simulated results.

Keywords

UHF filters; band-pass filters; microstrip filters; transmission lines; FR-4 substrate; ISM band; dual mode microstrip ring bandpass filter; frequency 2.37 GHz to 2.59 GHz; frequency 2.45 GHz; insertion loss; left handed transmission line; Band pass filters; Bandwidth; Impedance; Insertion loss; Microstrip resonators; Microwave technology; Optical ring resonators; Transmission line antennas; Transmission line measurements; Transmission lines; Dual-mode; degenerate modes; left-handed transmission line; ring resonator;

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.2007.4554646

Filename

4554646