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New dual-mode ring bandpass filter using symmetrical left-handed transmission line
Author(s)
Srisathit, K.
Jadpum, P.
Bunnjaweht, S.
Surakampontom, W.
Date Issued
December 1, 2007
Type
Conference Paper
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 2.45GHz ISM band application with a fractional bandwidth of 16.2 percentages. Across the bandwidth, the measured insertion loss is less than 1.5dB, whereas the input and output return losses are better than 20dB from 2.37 to 2.59GHz. The measured results are in good agreement with the simulated results.
Citation
Asia Pacific Microwave Conference Proceedings APMC, 2007