Wave transmission lines and networks – Resonators – Coaxial or shielded
Patent
1992-10-28
1994-04-19
Ham, Seungsook
Wave transmission lines and networks
Resonators
Coaxial or shielded
333223, 333234, H01P 130, H01P 704
Patent
active
053049683
ABSTRACT:
The present invention relates specifically to the temperature compensation of a resonator in which a rod or a conductor wound in the form of a cylindrical coil serving as an inner conductor is enclosed within a metal cover and in which the open end of the rod or the coil is spaced a given distance from the cover, thus forming a loading capacitance. A change in the resonant frequency caused by thermal expansion can be compensated for in that at the open end of the inner conductor within the housing there is provided a compensation plate (5), the center part (12) of which is spaced at a distance (a) from the top surface (4) of the housing and preferably in parallel therewith and which has at least at two opposite edge parts (8, 9) been attached to the top surface (4). The thermal coefficient of expansion of the compensation plate (5) is less than the coefficient of thermal expansion of the top surface (4), whereby the center part of the compensation plate (5) together, in response to a rise in temperature of the resonator, is urged towards the top surface (4), thus reducing the loading capacitance.
REFERENCES:
patent: 2205851 (1940-06-01), Hansell
patent: 3733567 (1973-05-01), Johnson
patent: 3740677 (1973-06-01), Kommrusch
patent: 3873949 (1975-03-01), Dorsi et al.
patent: 3876963 (1975-04-01), Graham
patent: 4057772 (1977-11-01), Basil, Jr. et al.
patent: 4156860 (1979-05-01), Atia et al.
patent: 4423398 (1983-12-01), Jachowski et al.
patent: 5032807 (1991-07-01), Petrovic
Patent Abstracts of Japan vol. 14, No. 455 (E-985), JP2182002, Sep. 1990.
Ervasti Kimmo
Ohtonen Jorma
Ham Seungsook
LK-Products OY
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