| 摘要 |
PURPOSE:To facilitate the correction of a resonance frequency and to reduce the passing loss by coupling orthogonal modes which use the same regularly circular or square cavities, and providing a cavity with deformed section which varies a propagation speed in the cavities of both modes. CONSTITUTION:A multistage band-pass filter consists of a circular cavity resonator of TE11n mode which resonates with electric fields 21 and 22 of orthogonal modes, i.e. vertical mode and horizontal mode or rectangular cavity resonator of TE10n mode which resonates with an electric field 31 of vertical mode and an electric field 32 of horizontal mode. The section of this circular or rectangular resonator is deformed from its regular shape to an ellipse or rectangle to couple the orthogonal modes with each other and also vary the propagation speed in each mode. Further, a corner of the ellipse or rectangle are cut to size (l) or E. The resonance frequency is adjusted easily with a screw, etc., to reduce the passing loss. |
