JPH0226104A - Resonance frequency control method for coaxial type dielectric resonator - Google Patents

Abstract

PURPOSE:To attain the control of high accuracy without executing the mechanical grinding of a dielectric by removing the opened surface side part of an outer circumference conductor from the outer circumference surface of the dielectric while the resonance frequency of a resonator is measured. CONSTITUTION:A resonator 7 is held to jigs 8 and revolved around a shaft line. A measuring instrument 12 measures the resonance frequency and sends a measured value to a laser device 10. In the device 10, the removal quantity of an outer circumference conductor 3 is calculated according to the measured value. Then, since programming is executed in advance so that the irradiation time of a laser light 11 and the moving quantity of an X-Y table 9 can be controlled, the necessary quantity of the outer circumference conductor 3 is automatically removed and the resonance frequency is controlled. When the partial removal of the outer circumference conductor 3 is finished, the measuring instrument 12 measures the resonance frequency again and it is confirmed that the resonance frequency is controlled to a rated value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for adjusting the resonant frequency of a coaxial dielectric resonator.

(Prior Art) A coaxial dielectric resonator is a resonator used in the microwave band. As shown in FIGS. 3 and 4, this resonator includes a cylindrical dielectric 1 and an inner periphery formed on the inner and outer surfaces of the dielectric 1 by baking silver paste or plating copper. comprising a conductor 2 and an outer circumferential conductor 3, and
One end surface of the dielectric 1 is a short-circuiting surface 5 provided with a conductor 4 that short-circuits the inner circumferential conductor 2 and the outer circumferential conductor 3, and the other surface of the dielectric 1 is an open surface 6. .

By the way, since the above-mentioned coaxial dielectric resonator 7 requires adjustment of the resonant frequency after its creation, conventionally, as shown in FIG. The length of the resonator was changed by mechanically grinding the 6th side, thereby adjusting the resonant frequency. In that case, first measure the resonant frequency of the unadjusted resonator, determine the amount of grinding for each resonator, and then grind it, and
After cleaning and drying, the resonant frequency is measured again to confirm whether the resonant frequency has been adjusted to the desired value.

However, with this method of adjusting the resonant frequency by mechanical grinding, the higher the resonant frequency, the greater the amount of change in the resonant frequency with respect to the amount of grinding, making it impossible to precisely adjust particularly high resonant frequencies. .

Moreover, since the dielectric body 1 is a highly brittle material, it is easy to cause chipping, chipping, etc. due to mechanical grinding, and adjustment is difficult.
In addition, it is difficult to control the wear of the grindstone, resulting in variations in the amount of grinding, resulting in various drawbacks such as poor accuracy and poor productivity.

(Objective of the Invention) The present invention has been made in order to eliminate the above-mentioned drawbacks, and it is an object of the present invention to provide a resonant frequency adjustment method that does not involve mechanical grinding of a dielectric material (and that allows highly accurate adjustment). With the goal.

(Structure of the Invention) The method of the present invention is characterized in that while measuring the resonant frequency of the resonator, the resonant frequency is adjusted by removing the open surface side portion of the outer circumferential conductor from the outer circumferential surface of the dielectric. shall be.

(Effects of the Invention) According to the present invention, since the amount of change in the resonant frequency with respect to the amount of removal of the open surface side portion of the outer circumferential conductor of the dielectric resonator is small,
The resonance frequency can be adjusted with higher precision than the conventional adjustment method using mechanical grinding. Furthermore, it is possible to adjust the high resonant frequency and has excellent productivity.

Furthermore, since the outer conductor is removed while measuring the resonance frequency, highly accurate automatic adjustment is possible.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a coaxial dielectric resonator whose resonant frequency is adjusted by the method of the present invention. The resonant frequency has been adjusted.

FIG. 2 shows a device for adjusting the resonant frequency by the method of the present invention, and 8.8 is a jig for measuring the resonant frequency while holding and rotating the resonator 7. .8 is provided on the X-Y table 9. 10 is a laser device, 11 is a part of the outer conductor 3 made of dielectric material
12 is a measuring device for measuring the resonance frequency.

Next, a method of adjusting the resonant frequency of a coaxial dielectric resonator using the apparatus shown in FIG. 2 will be described.

C1) Hold the resonator 7 with a jig 8.8 and rotate the resonator 7 around its axis.

(2) The resonator 7 measures the resonant frequency and sends the measured value to the laser device 10.

(3) The laser device 10 calculates the removal amount of the outer circumferential conductor 3 based on the measured value, and calculates the irradiation time of the laser beam 11 and the X-Y
Since it is programmed in advance to control the amount of movement of the table 9, the required amount of the outer circumferential conductor 3 is automatically removed and the resonant frequency is adjusted.

(4) When the partial removal of the outer conductor 3 is completed, the measuring device 12 measures the resonance frequency again to confirm that it has been adjusted to the standard value.

By the above procedure, the resonant frequency of the resonator 7 can be automatically adjusted with high precision.

In addition, in the apparatus shown in FIG. 2, the laser beam 11 is used to remove the outer circumferential conductor 3, but instead of the laser device 10, a device that injects fine alumina powder at high pressure and high speed is used to remove the fine alumina powder. Alternatively, a method may be adopted in which the outer circumferential conductor 3 is sprayed and removed.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a coaxial dielectric resonator whose resonant frequency is adjusted by the method of the present invention, Fig. 2 is a schematic configuration diagram of a resonant frequency adjustment device applied to the implementation of the present invention, and Fig. 3 is a perspective view of a coaxial dielectric resonator whose resonant frequency is adjusted by the method of the present invention. A perspective view of a coaxial dielectric resonator, FIG. 4 is a cross-sectional view, and FIG.
The figure is a perspective view for explaining a conventional resonance frequency adjustment method. 1-...Dielectric 2...Inner conductor 3-
...Outer conductor 5--Short-circuit surface 6--Open surface 7--Coaxial dielectric resonator 8--Jig X-Y table 10--Laser device - Laser light measuring device

Claims (1)

[Scope of Claims] A cylindrical dielectric, an inner circumferential conductor and an outer circumferential conductor formed on the inner circumferential surface and the outer circumferential surface of the dielectric, respectively, and one end surface of the dielectric is formed on the inner circumferential surface of the dielectric. A method for adjusting the resonant frequency of a coaxial dielectric resonator, the resonant frequency of which is a coaxial dielectric resonator, the resonator having a short-circuiting surface provided with a conductor that short-circuits a circumferential conductor and an outer circumferential conductor, and the other end surface of the dielectric being an open surface. The resonant frequency of the coaxial dielectric resonator is adjusted by removing the open surface side portion of the outer peripheral conductor from the outer peripheral surface of the dielectric while measuring the resonant frequency of the coaxial dielectric resonator. Adjustment method.