| 摘要 |
The present invention has: a conductive casing body having cavity resonators; a conductive cover which covers the cavity resonators; resonator elements which are positioned within the cavity resonators, one end whereof being connected to the casing body, and another end whereof being a free end; and movable conductors, which are positioned in spaces between the free ends of the resonator elements and the conductive cover. A tunable band-pass filter is thus implemented, whereby it is possible to easily change a resonance frequency of a cavity resonator and a coupling quantity between the cavity resonators, and which is inexpensive and has a simple structure. |
