JPS6360561B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resonant frequency adjustment mechanism for a dielectric resonator.

FIG. 1 relates to a conventional resonant frequency adjustment mechanism for a dielectric resonator. In the figure, 1 is a hermetic base, 2 is a metal case attached to base 1, 3 is a cylindrical dielectric resonator whose fundamental mode is TE ₀₁ δ mode, 4 is a resonator, and 3 is a fixing spacer. It is. Although the resonator 3 is not shown, for example
It is combined with a circuit using GaAsFET to form an oscillator. After hermetically sealing, it may be necessary to adjust the resonant frequency of the resonator 3, but of course this must be done from outside the case, and the airtightness must also be maintained. Generally, it is known that when a metallic substance is placed near or near the resonator 3, the resonant frequency changes due to its influence.As a simple frequency adjustment method in the above case, as shown by the dotted line 5 in Figure 1, There was a way to increase the frequency by recessing the top of case 2. However, with this method, after the hermetic seal, the resonance frequency may be higher than the target value from the beginning, or case 2 may occur during adjustment.
When the dent was too large, the frequency could no longer be processed to the target value, and the product had no choice but to be discarded.

Therefore, the main object of the present invention is to provide a resonant frequency adjustment mechanism for a dielectric resonator that can arbitrarily raise or lower the resonant frequency using a simple method.

The gist of the present invention is to provide dielectric resonators unevenly distributed in a space inside a metal case, and to provide a ridge section on one surface of the metal case that crosses between a portion facing the dielectric resonator and the other portions. This resonant frequency adjustment mechanism for a dielectric resonator is characterized in that a ridge portion is provided that intersects with the ridge portion and extends between a portion facing the dielectric resonator and other portions.

Examples of the present invention will be described below. Figure 2,
In FIG. 3, parts that are the same as those in FIG. 1 are given the same numbers and their explanations will be omitted. Reference numeral 12 denotes a metal case attached to the base 1. On one surface facing the resonator 3, for example, the upper surface of the case 12, a cross-shaped recess as shown in FIG. 2 is formed by a method such as pressing. To be more specific, a resonator 3 is provided in the space inside the case 12 using a spacer 4 so as to be unevenly distributed near the right end of the base 1 in the figure. On the upper surface of the case 12, a portion facing the resonator 3 is defined as Sa, and the other portions are defined as Sb. However, there is not a clear boundary between both parts Sa and Sb. The above-mentioned cross-shaped recess is the
It is an aggregate of a ridge 13 that crosses between Sa and Sb, a ridge 14 that extends to part Sa, and a ridge 15 that extends to part Sb. Each of the ridges 13 to 15 may be recessed toward the inside of the case 12 as in the illustrated example, or conversely may have a structure that protrudes toward the outside of the case 12. The cross-sectional shape of each ridge 13 to 15 is U
It can be arbitrary, such as a letter shape or a U-shape.

If, for example, the ridge 14 in part Sa is pushed with an adjustment rod or the like, part Sa will be depressed, while ridge 13 will function as a support shaft of a seesaw, and part Sb will be pushed.
is brought up. In this case, part Sa is resonator 3
, the resonant frequency increases. On the contrary, the part
For example, if you press the ridge 15 in Sb with an adjustment rod,
While part Sb is depressed, part Sa is raised. In this case, the region Sa moves away from the resonator 3, so the resonant frequency decreases. In this way, when you press part Sa, the resonant frequency increases, and when you press part Sb, the resonant frequency decreases, so if you pass the target value while adjusting the resonant frequency, you can press the part opposite to the part you were pressing until now. If you press , the resonance frequency will move to the target value again. In addition, parts Sa, Sb
Whenever something rises or falls, in reality,
A displacement equivalent to the thickness of the case 12 is enough to achieve the purpose.

As is clear from the above embodiments, according to the present invention, it is possible to raise or lower the resonant frequency of the resonator from outside the case, so that the resonant frequency may be higher than the target value from the beginning. Conventionally, if the value exceeds the target value due to adjustment, the only option was to discard it, but by readjusting it, the product can be made into a good product, increasing the rate of non-defective products, and easing the standards during assembly. Since it can be set, standard working time (ST) can be shortened and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the inside of a conventional example, FIG. 2 is a plan view of an embodiment of the present invention, and FIG. 3 is a sectional view showing the inside. 3 is a dielectric resonator, 13 to 15 are ridges, Sa is a resonator, a part facing 3, and Sb are other parts.

Claims (1)

[Claims] 1 The dielectric resonators are unevenly distributed in the space inside the metal case, and a ridge section is provided on one side of the metal case that crosses between the part facing the dielectric resonator and the other parts, and this ridge part and cross,
A resonant frequency adjustment mechanism for a dielectric resonator, characterized in that a ridge portion extending between a portion facing the dielectric resonator and a portion other than the dielectric resonator is provided.