| 摘要 |
Dielectrics fixed on holders respectively provided at semi-coaxial cavity resonator stages are movably inserted through an outer conductor. The holders projecting out of the outer conductor are coupled to a coupling member, and the coupling member is directed to slide or turn, so that distances between the dielectrics and the inner conductors of the resonators are varied, and accordingly frequencies of the resonators are varied at the same time. Accordingly, there is provided a tunable filter that avoids an increase in insertion loss, is high-power resistant, does not cause intermodulation, and allows a center frequency of the filter to be varied steplessly and quickly.
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