Temperature compensated resonator
First Claim
1. A temperature compensated radio frequency resonator, comprising:
- an electrically conducting housing provided with a side surface, a bottom surface and a top surface;
a conductive post inside the housing and having one end electrically connected to the bottom surface and another end spaced from the top surface;
a compensation plate within said housing and having a center part spaced from the top surface, said center part rigidly attached to at least at two opposite edge parts which are attached to said top surface,said compensation plate having a coefficient of thermal expansion that is less than a coefficient of thermal expansion of the top surface, whereby in response to a rise in temperature, the center part of the compensation plate is urged towards the top surface so as to counter capacitive change effects occurring as a result of said rise in temperature.
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Accused Products
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.
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Citations
7 Claims
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1. A temperature compensated radio frequency resonator, comprising:
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an electrically conducting housing provided with a side surface, a bottom surface and a top surface; a conductive post inside the housing and having one end electrically connected to the bottom surface and another end spaced from the top surface; a compensation plate within said housing and having a center part spaced from the top surface, said center part rigidly attached to at least at two opposite edge parts which are attached to said top surface, said compensation plate having a coefficient of thermal expansion that is less than a coefficient of thermal expansion of the top surface, whereby in response to a rise in temperature, the center part of the compensation plate is urged towards the top surface so as to counter capacitive change effects occurring as a result of said rise in temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification