Wave transmission lines and networks – Resonators – Cavity resonator
Patent
1996-04-19
1998-05-19
Ham, Seungsook
Wave transmission lines and networks
Resonators
Cavity resonator
333232, 333234, H01P 130, H01P 706
Patent
active
057540845
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/FI94/00470 filed Oct. 19, 1994 published as WO95/11529 Apr. 27, 1995.
BACKGROUND OF THE INVENTION
The invention relates to a temperature-compensated signal resonator comprising a control rod disposed in a resonator housing for controlling the center resonance frequency; a conductor tube secured to the housing and coaxially disposed around the control rod; a regulating tube which is attached to the inner end of the control rod and which is coaxial with the control rod and the conductor tube; and temperature-compensation means for compensating for longitudinal changes exhibited by the unit consisting of the control rod, the conductor tube and the regulating tube for changes in temperature.
Similar resonator are known from the prior art: e.g. the resonator manufactured by CELWAVE Division of Radio Frequency Systems, Inc., a unit of Alcatel Network Systems, headquartered in Richardson, Tex., where temperature compensation is implemented by a temperature-compensation device projecting from the exterior surface of the resonator housing. A significant drawback of this solution is that the resonator takes up a lot of space. The size of the resonator further increases if it is to be controlled automatically, in which case a stepper motor has to be connected to the control rod.
SUMMARY OF THE INVENTION
The object of the present invention is to obviate the above-mentioned drawback. This is achieved with a resonator of the type described in the foregoing BACKGROUND section, this resonator being characterized according to the invention in that the temperature-compensation means comprise a temperature-compensation tube which moves the control rod in proportion to variations in temperature and which is disposed within the conductor tube and secured to the inner end of the conductor tube.
The most significant advantage of the invention is that the temperature-compensated resonator of the invention is clearly shorter than resonators of the prior art. To implement temperature compensation in accordance with the invention does not increase the size of the resonator--at least not its length--since the temperature-compensation means of the invention can be positioned entirely within a conventional resonator housing.
Another significant advantage is that by widening the conductor tube suitably, it is possible to mount a stepper motor at the end of the control rod.
BRIEF DESCRIPTION OF THE DRAWING
In the following, the invention will be described in greater detail by means of two preferred embodiments and with reference to the accompanying drawing, in which
FIG. 1 is a simplified cross-section of a manually-controlled temperature-compensated resonator according to a first embodiment of the present invention, and
FIG. 2 is a corresponding cross-section of an automatically-controlled resonator according to a second embodiment of the invention.
DETAILED DESCRIPTION
The manually-controlled resonator shown in FIG. 1 comprises a resonator housing 1; a control rod 2 preferably made of Invar.RTM. nickel steel alloy and disposed within the housing 1 for controlling the center frequency; a conductor tube 3 which is secured to the housing 1 and coaxially disposed around the control rod 2 and which is preferably made of copper; and a regulating tube 4 which is attached to the inner end of the control rod 2, which is coaxial with the control rod 2 and the conductor tube 3, and which is preferably made of copper 4 and arranged to slide on the conductor tube 3.
In addition, the resonator comprises a temperature-compensation tube 5 disposed within the conductor tube 3 coaxially therewith and attached to the inner end of the conductor tube 3, this temperature-compensation tube 5 being mounted on the inner surface of the conductor tube 3 for compensating for longitudinal changes exhibited by the unit consisting of the control rod 2, the conductor tube 3 and the regulating tube 4 for changes in temperature. This temperature-compensation tube 5 is preferably made of alumin
REFERENCES:
patent: 2103515 (1937-12-01), Conklin et al.
patent: 3160825 (1964-12-01), Derr
patent: 3187278 (1965-06-01), Wheeler
patent: 4292610 (1981-09-01), Makimoto et al.
patent: 4521754 (1985-06-01), Ranghelli et al.
patent: 4933652 (1990-06-01), Gaukel
patent: 5216388 (1993-06-01), Dipoala
Ham Seungsook
Nokia Telecommunications Oy
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