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A Design of Varactor-Tuned Combline Bandpass Filter Using Coupling Varactor Diode  

Kim Byung-Wook (Dept. of Electronic Engineering, Sogang University)
Back Hyung-Il (Dept. of Electronic Engineering, Sogang University)
Yun Sang-Won (Dept. of Electronic Engineering, Sogang University)
Publication Information
Journal of electromagnetic engineering and science / v.5, no.2, 2005 , pp. 80-86 More about this Journal
Abstract
In this paper, a novel varactor-tuned combline bandpass filter is presented. The coupling varactor diode between line elements is introduced to control the passband bandwidth so that the passband bandwidth can be maintained almost constant within the tuning range. The equivalent circuit and design equations are derived, and the optimum design is discussed. A 1.7 GHz, two-pole bandpass filter with a bandwidth of $4.5\%$ was constructed. The absolute passband bandwidth was maintained almost constant within more than 0.4 octave tuning range.
Keywords
Comb line Bandpass Filter; Constant Passband Bandwidth; Tunable Bandpass Filter;
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