JPH07263926A - Dielectric resonator - Google Patents

Abstract

PURPOSE:To increase/reduce the resonance frequency of a dielectric resonator to continuously and finely adjust it, to make the resonator small in size and light in weight, and to improve the use efficiency of the mounting space. CONSTITUTION:With respect to the dielectric resonator where the shape above a dielectric substrate 4 whose upper face a dielectric resonance element 2 is arranged on is covered with a shield case 1, a resonance frequency adjusting member 6 a part or the whole of which is made of a metallic conductor has a nonlinear shape, which has an eccentric shaft part in the direction of the axis of rotation, and is freely turnably set in the side wall part of the shield case, and the eccentric shaft part is separated from the resonance element by turning. Consequently, the resonance frequency of the dielectric resonator is continuously and finely adjusted by increased/reduction, and the resonator is made small in sized and light in weight, annd the use efficiency of the mounting space is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator used in a microwave band, and more particularly to a dielectric resonator having a resonance frequency adjusting mechanism.

[0002]

2. Description of the Related Art A dielectric resonator used as a resonator suitable for a microwave frequency band in satellite communication or mobile communication is formed of a ferroelectric material such as ceramics and combined with a coupling circuit to form a conductive metal. The resonator is housed in a case, and the resonance frequency of the resonator is determined by the permittivity of the dielectric and the external dimensions.

However, in order to properly process the outer dimensions of the dielectric to adjust it to a desired resonance frequency, it is considerably difficult to cut the outer dimensions because the ceramics mainly used as the dielectric are hard materials. There is a limit to the adjustment range for adjusting the resonance frequency to a desired value by machining, and it is impossible to perform fine adjustment with high accuracy. Therefore, it is necessary to provide the dielectric resonator with a structure that allows fine adjustment of the resonance frequency.

By the way, it is known that in a dielectric resonator, the resonance frequency fluctuates due to the influence of a change in external conditions when a conductive substance is brought closer to the outside. Conventionally, as a method of adjusting the resonance frequency of the dielectric resonator by using this property, adjustment of the resonance frequency has been realized by connecting and separating a metal conductor from above the dielectric resonance element.

For example, as shown in FIG. 3, a dielectric substrate 14
A dielectric resonant element 12 is fixedly mounted on the upper surface of the dielectric substrate 14 via a spacer 13, and the back surface of the dielectric substrate 14 is bonded and fixed to a conductor bottom plate 15 serving as a ground conductor. An upper surface wall which is covered with a conductive shield case 11 and which is a canopy of the conductive shield case 11 facing directly above the dielectric resonant element 12,
The frequency adjusting screw 16 is rotatably screwed into the screw 1
By rotating 6 the dielectric resonance element 12
The separation length with respect to is configured to be variable.

[0006]

However, the conventional technique has a drawback in that the upper portion of the frequency adjusting screw 16 projects above the upper surface of the shield case 11. Further, since the adjustment screw 16 is supported and the screw hole is formed, the wall thickness of the canopy of the shield case 11 is also limited to some extent. In other words, it is difficult to reduce the wall thickness. Therefore, there are drawbacks such that the reduction in size and weight of the dielectric resonator itself is hindered.

Further, in addition to the above-described inherent protrusion of the screw, the adjustment screw moves in the vertical direction during the adjustment work, and the adjustment screw is rotated at the time of mounting. It was necessary to secure sufficient space around the screws. Due to these factors, the actual mounting efficiency is reduced.

Further, as disclosed in Japanese Utility Model Publication No. 63-20168, two discs are rotatably attached to the shield case canopy, and the protrusion of the lower disc facing the resonant element is caused by the rotation of the discs. A technique has been proposed in which the frequency is adjusted by separating from the resonance element. However, this method is still the same in that the adjusting member is projected to the canopy portion of the shield case, and the miniaturization cannot be achieved.

In contrast to the above-mentioned conventional drawbacks, the present invention makes it possible to adjust the resonance frequency of the dielectric resonator by increasing or decreasing, and at the same time, reduce the size and weight of the resonator and improve the utilization rate of the mounting space. It is an object of the present invention to provide a dielectric resonator capable of achieving the above.

[0010]

In order to solve the above technical problems, the present invention provides a dielectric resonator in which an upper space of a dielectric substrate having a dielectric resonant element on its upper surface is accommodated by a conductive shield case. , A non-linear member provided with a metal shaft portion eccentric to the rotary shaft between the side walls of the shield case is rotatably attached, and the rotation of the non-linear member causes the shaft portion to act as a resonance element. The frequency adjustment is performed by separating them.

[0011]

According to the above technical means, by rotating the resonance frequency adjusting member, the dielectric resonance element disposed in the shield case and the dielectric resonance element of the resonance frequency adjusting member are rotated. It is possible to continuously change the separation length from the closest position with respect to the rotation angle, and it is possible to continuously and easily adjust the resonance frequency of the dielectric resonator.

Further, unlike the prior art, the frequency adjusting screw or the like does not project on the upper surface of the shield case, and the thinning of the shield case can be easily achieved. Furthermore, since it is not necessary to engrave a screw hole or the like for supporting the adjustment screw, the thickness of the shield case canopy is not limited and the thickness can be easily reduced.

Furthermore, in addition to this, since there is no upper protruding portion, it is possible to improve the space utilization efficiency during mounting.

As a result, a continuous and delicate frequency adjusting operation can be performed with high efficiency while assembling the respective constituent members in the manufacturing process as a product, and a compact and lightweight dielectric resonator of stable quality can be obtained. You can

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be illustratively described in detail below with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, other relative arrangements, etc. of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but merely illustrative examples. It is nothing more than a thing.

1 and 2 show a dielectric resonator according to an embodiment of the present invention, FIG. 1 is a perspective view, and FIG. 2 is a vertical sectional view.

In the figure, the dielectric resonance element 2 is fixedly mounted on a dielectric substrate 4, and the substrate 4 is housed in a shield case 1 made of a metal conductor.

In the shield case 1, the frequency adjusting member 6 made of a metal conductor is provided in the shield case 1.
It is installed on the side surface of the inner wall and has a structure that is rotatable in the upper space of the dielectric resonance element 2. The frequency adjusting member 6 has a crank shape in which a shaft portion provided with an eccentric rotation axis is provided, and an eccentric shaft portion is provided with respect to the rotation axis of the frequency adjusting member 6 in the internal space of the shield case 1. Rotate with a radius.

By this rotation, the frequency adjusting member 6
Since it is possible to continuously change the separation length between the closest position with respect to the dielectric resonance element 2, the resonance frequency of the dielectric resonator can also be continuously changed.

With such a structure and adjustment method, the assembly and frequency adjustment work can be smoothly and efficiently performed, and as a result, it is possible to provide a high-quality dielectric resonator with high stability and stability. I can.

[0021]

As described above, according to the configuration and method of the present invention, the size and weight of the resonator can be reduced while continuously and subtly adjusting the resonance frequency of the dielectric resonator. Further, it becomes possible to exert various remarkable effects such as improvement of utilization efficiency of the mounting space.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention.

FIG. 2 is a schematic explanatory view showing an embodiment of the present invention.

FIG. 3 is a schematic explanatory view showing a conventional example.

[Explanation of symbols]

 1 Shield Case 2 Dielectric Resonant Element 3 Spacer 4 Dielectric Substrate 5 Conductor Bottom Plate 6 Frequency Adjustment Member

Claims (1)

[Claims] 1. A dielectric resonator in which an upper space of a dielectric substrate having a dielectric resonance element arranged on an upper surface thereof is accommodated by a conductive shield case, wherein a metal shaft eccentric to a rotary shaft is provided between side walls of the shield case. A non-linear member provided with a section is rotatably attached, and the shaft section is separated from the resonance element by the rotation of the non-linear member, so that frequency adjustment is performed. Body resonator.