Two types of tunable filters have been developed at 400- and 800-MHz frequency bands, respectively. These filters have been fabricated with low-temperature co-fired-ceramics multilayer technologies assisted by varactor diodes. The filter size is 5.6 /spl times/ 5.6 /spl times/ 3.0 mm. Each filter has approximately 11% and 13% tuning range of frequency with a controlling voltage of 1-4 V, IL < 2.0 dB, and has an attenuation over 40 dB at fo /spl plusmn/ 30%, respectively. Temperature stability data is also discussed.
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Kageyama et al. (2001) studied this question.
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