| 摘要 |
PURPOSE:To attain a filter control method which can be automated easily with excellent airtightness by storing plural resonators consisting of dielectric cores surrounding inner conductors into a metallic case and deleting properly the free terminal of the inner conductor or the metallic film on the dielectric core to perform the control of frequency. CONSTITUTION:An inner conductor 99 of a prescribed length which is formed into such a shape that the free terminal of one side can be slightly deleted with the other terminal short-circuited to a case 6. Then a core 3 encloses the conductor 99. Thus plural resonators are obtained. A conductor film 5 is formed to the case 6, and a mask plate 4 is attached at the upper part of the case 6. An input terminal 7a is attached to the case 6. The conductor 99 is formed by plating copper or silver of low resistance to a metal like brass, iron, etc. An inner conductor 99a is formed into a staircase shape, for example, at its upper edge part, and projected parts are successively trimmed by a laser, etc. to obtain a desired electric characteristic standard. Thus it is possible to attain a filter control method which can be automated easily with excellent airtightness. It is also possible to constitute a resonator with an outer conductor and a dielectric core which is metallized into such a shape that can be deleted. |
