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http://dx.doi.org/10.5515/KJKIEES.2007.18.10.1126

Miniaturized Hairpin Tunable Filter with the Single Control Voltage  

Myoung, Seong-Sik (Dept. of Electrical and Electronic Engineering, Yonsei University)
Hong, Young-Pyo (Dept. of Electrical and Electronic Engineering, Yonsei University)
Jang, Byung-Jun (School of Electrical Engineering, Kookmin University)
Lee, Yong-Shik (Dept. of Electrical and Electronic Engineering, Yonsei University)
Yook, Jong-Gwan (Dept. of Electrical and Electronic Engineering, Yonsei University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.18, no.10, 2007 , pp. 1126-1135 More about this Journal
Abstract
This paper presents the varactor-tuned miniaturized hairpin tunable filter with a single control voltage. The previously proposed miniaturization method is a very straight-forward method to miniaturize a parallel coupled-line filter. In this paper, the miniaturized hairpin tunable filter is proposed with the constant ratio rule of that the capacitances of the each stage always have constant ratio without any dependency to miniaturized electrical length. To show the validity of the proposed method, a 3rd order 0.5 dB ripple Chebyshev fitter with a center frequency of 900 MHz and a fractional bandwidth(FBW) of 10 % was designed and fabricated. The fabricated filter was based on CER-10 substrate of Taconic Inc. with 1SV277 varactor diode of Toshiba Inc. The center frequency of the fabricated filter can be changed from 606 MHz to 944 MHz, 338 MHz with the control voltage from 0.5 V to 4 V. The insertion loss of the proposed filter is increased with the increment of the control voltage, and the filter characteristics are well reserved expect of slight change of the bandwidth with the various control voltage.
Keywords
Tunable Filter; Miniaturization; Parallel Coupled-Line Filer; Capacitor; Grounding; Single Bias;
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  • Reference
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