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J. Electromagn. Eng. Sci > Volume 13(2); 2013 > Article
Journal of Electromagnetic Engineering and Science 2013;13(2):93-103.
DOI: https://doi.org/10.5515/JKIEES.2013.13.2.93   
Harmonic Suppressed Dual-Band Bandpass Filter with Independently Tunable Center Frequencies and Bandwidths
Girdhari Chaudhary1, Yongchae Jeong1, Jongsik Lim2
1Department of Electronics and Information Engineering, Chonbuk National University
2Department of Electrical and Communication Engineering, Soonchunhyang University
Abstract
This paper presented a novel approach for the design of a tunable dual-band bandpass filter (BPF) with independently tunable passband center frequencies and bandwidths. The newly proposed dual-band filter principally comprised two dual-mode single band filters using common input/output lines. Each single BPF was realized using a varactor-loaded transmission line resonator. To suppress the harmonics over a broad bandwidth, a defected ground structure was used at the input/output feeding lines. From the experimental results, it was found that the proposed filter exhibited the first passband center frequency tunable range from 1.48 to 1.8 GHz with a 3-dB fractional bandwidth (FBW) variation from 5.76% to 8.55%, while the second passband center's frequency tunable range was 2.40 to 2.88 GHz with a 3-dB FBW variation from 8.28% to 12.42%. The measured results of the proposed filters showed a rejection level of 19 dB up to more than 10 times the highest center frequency of the first passband.
Key words: Defected Ground Structure, Harmonic Suppression, Independently Tunable Center Frequency and Bandwidths, Tunable Dual-Band Bandpass Filter, Varactor Diode
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