| 摘要 |
PURPOSE:To realize a wide band filter, and not only to stabilize a characteristic but also simplify assembling, by forming an energizing electrode of half-wavelength on the outside circumferential surface of a dielectric resonator. CONSTITUTION:In a case 4 having inside dimensions of a cut-off state in a working frequency area, a substrate 5 is provided, and on this substrate 5, three dielectric resonators 1a-1c are provided at each interval. On the dielectric resonators 1a, 1c of the first stage and the last stage, an energizing electrode 3 of half-wavelength, provided long in the circumferential direction on the outside circumferential surface is provided, and is made to conduct with a center pin 7 of a connector 6. The energizing electrode 3 is provided by forming it by means of spattering by printing or masking silver paste, or sticking a foil- like or a plate-like electrode by use of an adhesive agent. |
