Wave transmission lines and networks – Resonators – Coaxial or shielded
Patent
1983-08-29
1985-06-04
Nussbaum, Marvin L.
Wave transmission lines and networks
Resonators
Coaxial or shielded
333207, 333226, 333234, H01P 704
Patent
active
045217548
ABSTRACT:
The microwave resonator includes an enclosed resonator housing and a hollow central conductor having one end fastened to a bottom of the resonator housing and extending toward a top wall of the resonator housing. The other end of the central conductors is spaced from the top wall and includes an adjustable bellows assembly disposed coaxial of a longitudinal axis of the central conductor. A non-rotating, axially movable drive shaft is disposed coaxial of the axis of the central conductor within the central conductor. One end of the drive shaft is fastened to the bellows assembly and the other end of the drive shaft is coupled to a drive means disposed in the bottom wall to cause axial movement of the drive shaft to adjust the axial length of the bellows assembly and, hence, the axial length of the central conductor to adjust the resonant frequency of the microwave resonator. By selecting the material from which the housing and the central conductor is made to have a first selected coefficient of thermal expansion and by selecting the material the drive shaft is made from to have a second selected coefficient of thermal expansion. The first and second coefficients of thermal expansion are selected to minimize resonant frequency drift due to temperature variations and, hence, provides temperature compensation for the microwave resonator.
REFERENCES:
patent: 2103515 (1937-12-01), Conklin et al.
patent: 2205851 (1940-06-01), Hansell
patent: 3748604 (1973-07-01), Wang
"Sperry-Cast Precision Sandcasting as Applied to Microwave Components", Sperry Gyroscope Company, Division of Sperry Rand Corporation, Great Neck, N.Y., Pub. No. 10-106 IM 3-56, Received U.S. Patent Office Apr. 4, 1965; 8 Pages.
La Bella Joseph A.
Ranghelli Joseph C.
International Telephone and Telegraph Corporation
Morris Jeffrey P.
Nussbaum Marvin L.
O'Halloran John T.
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