[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5515/JKIEES.2013.13.2.93

Harmonic Suppressed Dual-Band Bandpass Filter with Independently Tunable Center Frequencies and Bandwidths

Chaudhary, Girdhari (Department of Electronics and Information Engineering, Chonbuk National University)
Jeong, Yongchae (Department of Electronics and Information Engineering, Chonbuk National University)
Lim, Jongsik (Department of Electrical and Communication Engineering, Soonchunhyang University)

Publication Information

Journal of electromagnetic engineering and science / v.13, no.2, 2013 , pp. 93-103 More about this Journal

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.

Keywords

Defected Ground Structure; Harmonic Suppression; Independently Tunable Center Frequency and Bandwidths; Tunable Dual-Band Bandpass Filter; Varactor Diode;

Citations & Related Records

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