JPS6218964Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a temperature compensated semi-coaxial resonator which has a very good temperature compensation effect and is widely used in communication equipment and the like.

The structure of a conventional temperature-compensated semi-coaxial resonator is shown, for example, in the exploded perspective view and cross-sectional view of FIG. That is, the coupling loops 7 and 8 and the 1/4 wavelength resonance rod 6 are provided in the resonance member 5, the signals are coupled through the input/output terminals 1 and 3, and the 1/4 wavelength resonance rod is provided in the cavity 9.
It includes a four-wavelength resonant rod 6 and a tuning screw 2 for its resonant frequency. In this case, in order to minimize the shift in the resonance frequency due to ambient temperature fluctuations, a material such as invar, which has a small coefficient of linear expansion, is used for the resonance member 5 and the quarter-wavelength resonance rod 6. This configuration is heavier than aluminum and is not suitable for use as a device mounted on an artificial satellite. Therefore, only the 1/4 wavelength resonant rod 6 shown in Fig. 1 is made of Invar material, and the resonant member 5 is made of aluminum. However, the amount of change in the length of the 1/4 wavelength resonant rod 6 and
In order for the amount of change in the tip load capacity 10 of the wavelength resonant bar to cancel each other out, it is necessary to reduce the amount of change in the tip load capacity 10, and the semi-coaxial resonator becomes larger.
There was a problem in that it was difficult to make the temperature compensation semi-coaxial resonator smaller and lighter.

The purpose of the present invention is to eliminate these drawbacks and, for example, to make the resonant member 5 made of aluminum material and the 1/4 wavelength resonant rod made of aluminum material and invar material.
The object of the present invention is to provide a small and lightweight semi-coaxial resonator which minimizes the deviation in the resonant frequency of the resonator by electrically and mechanically connecting metals having different coefficients of linear expansion.

Figures 2a and 2b are an exploded perspective view and a sectional view of an embodiment of the present invention. That is, 1 is a signal input terminal, 2 is a tuning screw of the semi-coaxial resonator, 3 is a signal output terminal, 4 is a stopper for the tuning screw, 5 is a resonance member, 6 and 6' are 1/4 wavelength resonance rods, 7 and 8 is the coupling loop, 9 is the cavity, and 10 is the tip load capacity.
Here, the 1/4 wavelength resonant rods 6, 6' are made by electrically and mechanically connecting two different metals with different coefficients of linear expansion by soldering or the like. Therefore, by appropriately selecting the ratio of the respective lengths of these resonant rods 6 and 6', it is possible to change the amount of change in the length of the 1/4 wavelength resonant rod and the tip of the 1/4 wavelength resonant rod with respect to ambient temperature fluctuations. The amount of change in the load capacitance 10 cancels each other out, so that the shift in the resonant frequency of the semi-coaxial resonator can be minimized.

With this configuration, a shift in the resonant frequency of the semi-coaxial resonator due to ambient temperature fluctuations can be minimized, and a small and lightweight semi-coaxial resonator can be realized. Also, the resonant member 5
By configuring the 1/4 wavelength resonator rod part 6' of the same metal, there is no electrical connection point with different metals at the point where the electrical density is maximum, and the semi-coaxial resonator is unloaded. Q can be increased.

As explained above, the present invention makes it possible to minimize the resonant frequency of the semi-coaxial resonator against ambient temperature fluctuations, and also to minimize the unloaded Q of the semi-coaxial resonator.
As a result, communication equipment using semi-coaxial resonators can be made smaller, lighter, and have improved performance. It is particularly suitable for cases where small size, light weight, and high performance are required, such as satellite-mounted electronic equipment. Furthermore, this semi-coaxial resonator is effective in improving the temperature characteristics of wave generators, phase equalizers, and self-excited oscillators used in narrowband communication channels from UHF to X-band.

[Brief explanation of the drawing]

1A and 1B are an exploded perspective view and a sectional view of a conventional semi-coaxial resonator, and FIGS. 2A and 2B are an exploded perspective view and a sectional view of an embodiment of the present invention. In the figure, 1...signal input terminal, 2...tuning screw of half-coaxial resonator, 3...signal output terminal, 4...tuning screw rotation stopper, 5...resonant member, 6, 6'...1 /4 wavelength resonant bar, 7 and 8... coupling loop, 9... cavity, 10... tip load capacity.

Claims (1)

[Scope of utility model registration request] The 1/4 wavelength resonant rod of the semi-collective axis resonator, which consists of a 1/4 wavelength resonant rod and a resonant member, is divided into two parts with different coefficients of linear expansion.
It is constructed by electrically and mechanically connecting different types of metals, and the metal connected to the resonant member and the resonant member of the two types of dissimilar metals are integrated with the same metal. temperature compensated semi-coaxial resonator.