Wave transmission lines and networks – Resonators – Temperature compensated
Patent
1996-03-18
1997-11-11
Lee, Benny T.
Wave transmission lines and networks
Resonators
Temperature compensated
333222, 333224, 333229, H01P 700
Patent
active
056868740
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/FI95/00404 filed Jul. 17, 1995.
BACKGROUND OF THE INVENTION
The present invention relates to a temperature-compensated combiner comprising a control rod disposed in a combiner housing for controlling the middle frequency; a resonator tube secured to the housing and coaxially disposed around the control rod; a regulating cup which is arranged at that end of the control rod which faces the housing and which is coaxial with the control rod and the resonator tube; a motor which controls the middle frequency and which is arranged at that end of the control rod which faces away from the combiner housing; and temperature-compensating means for compensating for longitudinal changes exhibited by a unit consisting of the control rod, the resonator tube and the regulating cup for changes in temperature. The temperature-compensating means comprises a temperature-compensating tube which moves the control rod in response to changes in temperature. The temperature-compensating tube is positioned within the resonator tube and secured to that end of the resonator tube which faces the housing and to the frame of the motor.
This type of solution, disclosed in Finnish Patent Application 934,630, (corresponding to U.S. patent application Ser. No. 08/632,399, filed Apr. 19, 1996) is designed to replace for instance the combiner manufactured by CELWAVE, where temperature compensation is implemented by a temperature-compensation device projecting from the exterior surface of the combiner housing, a significant drawback of this solution being that the combiner takes-up a lot of space. The combiner takes up an especially great amount of space when the combiner is made automatically controllable by connecting a motor, for instance a stepper motor, to the control rod.
In the solution according to Finnish Patent Application 934,630, however, it is difficult to position the motor in its entirety within the combiner housing, and thus, in practice, part of the motor still remains outside the housing.
SUMMARY OF THE INVENTION
The object of the present invention is to obviate the above-mentioned drawback. This is achieved with the type of combiner described above, characterized according to the invention in that the regulating cup is fitted to the control rod with two sleeves which are positioned one within the other and made of different materials, a first sleeve being attached around the control rod to that end of the control rod which faces the regulating cup, and a second sleeve being attached to that end of the first sleeve which faces away from the regulating cup and to the regulating cup around the first sleeve, these sleeves forming additional temperature-compensating means, whereby the motor controlling the middle frequency can be positioned entirely within the resonator tube.
The invention is based on the idea to use, in addition to the above-mentioned temperature-compensating tube, additional temperature-compensating means which are positioned one within the other and which expand in opposite directions in a different manner by the action of heat, whereby the control rod to be connected to the motor shaft can be shortened to such an extent that the motor can be positioned entirely within the resonator tube and thus within the entire combiner housing.
When the motor is positioned entirely within the combiner housing, it is significantly easier than before to position the combiner in a dedicated stand. At the same time, the increase in waste space is avoided.
BRIEF DESCRIPTION OF THE DRAWING
In the following, the invention will be described in more detail by means of one preferred embodiment with reference to the accompanying drawing, in which: FIG. 1 is a simplified cross-section of the automatically controllable, temperature-compensated combiner of the invention.
DETAILED DESCRIPTION
The automatically controllable combiner shown in the drawing comprises a combiner housing 1; a control rod 2 for controlling the middle frequency, preferably made of a 36 w
REFERENCES:
patent: 2077800 (1937-04-01), Kroger
patent: 2998582 (1961-08-01), Riblet
patent: 4251754 (1981-02-01), Ranghelli et al.
patent: 4292610 (1981-09-01), Makimoto et al.
patent: 4661790 (1987-04-01), Gannon et al.
patent: 4726071 (1988-02-01), Jachowski
Gambino Darius
Lee Benny T.
Nokia Telecommunications Oy
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