| 摘要 |
PURPOSE:To attain both hermetic sealing and control of frequency by putting a metallic screw into a hermetically sealed package from outside in opposition to a dielectric resonator and changing the distance between the resonator and the metallic screw. CONSTITUTION:A package of an oscillator consists of a metallic chassis 17, a cover 8 and a substrate 1 of a high dielectric constant. The bottom part of the chassis 17 has a large thickness, and a tap hole 17a is drilled at the position of a dielectric resonator 2. A metallic screw 22 for control of frequency is fitted into the hole 17a. The rear conductor pattern of the substrate 1 is partially deleted at the lower surface part of the resonator 2. Thus a part of an electromagnetic field excited by the resonator 2 flows out to the hole 17a. The oscillation frequency is controlled by changing the position of the screw 22. The hermetic sealing is assured by means of the chassis 17, the cover 8 and the substrate 1.
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