| 摘要 |
A bandpass filter (10) comprises: a filter case (17) that prescribes a rectangular waveguide (11) having narrow-width faces (a) and broad-width faces (b); ladder-shaped metal plates (12) enclosed at the middle of the broad-width faces (b) by the filter case (17) so as to be parallel to the narrow-width faces (a); a guiding plate (13) positioned in the vicinity of the metal plates (12); a support rod (14), parallel to the longitudinal direction of the rectangular waveguide (11), that is rotatably supported by the filter casing (17) and supports the guiding plate (13); and a first gear (15) attached to a leading end of the support rod (14). Rotating the first gear (15) causes the guiding plate (13) to rotate and the bandpass frequency to be adjusted. |
