JPH083046Y2 - Dielectric resonator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a dielectric resonator using a TM mode, and more particularly to a dielectric resonator having a shape suitable for integral molding.

[Prior Art] FIG. 2 shows a dielectric resonator 1 of interest to the present invention.
It is shown. The dielectric resonator 1 has a dielectric column 2 and an opening 3 (only one of which is shown in the figure) because the dielectric column 2 is located inside and opposite side surfaces of the dielectric column 2 are coupled to other resonators. ) And a case 4 forming an actual current path.

More specifically, in order to prevent such deterioration of the temperature characteristic of the resonance frequency of the dielectric resonator 1, when the dielectric pillar 2 is made of, for example, ceramic, in order to match the coefficient of thermal expansion with that, The case 4 is also made of ceramic. Therefore, in order to form a real current path in the case 4 made of ceramic, a conductive film is formed on the inner surface and / or the outer surface of the case 4. In the example shown in FIG. 2, the conductive film 5 is formed on both the inner surface and the outer surface of the case 4.

In this manner, the TM mode dielectric resonator 1 is obtained by one dielectric pillar 2 and the case 4 forming the actual current path.

Attempts have been made to integrally manufacture the ceramic portion constituting such a dielectric resonator 1. Second
The dielectric resonator 1 shown in the figure has such a shape that a ceramic portion can be obtained by integral molding.

[Problems to be Solved by the Invention] In order to match the resonance frequency obtained by the dielectric resonator 1 to the required band, the dielectric pillar 2 has a larger first frequency adjustment hole 6 and a smaller second frequency adjustment hole 6. And the frequency adjusting hole 7 are formed. The larger first frequency adjustment hole 6 is for adjusting the resonance frequency in a relatively wide range, while the smaller second frequency adjustment hole 7 is for resonance with a smaller width. It is for adjusting the frequency, that is, for finely adjusting the resonance frequency. The case 4 has a dummy hole 8 formed coaxially with the second frequency adjusting hole 7. The dummy hole 8 does not have a special function by itself, but is a hole that is inevitably formed when the second frequency adjusting hole 7 is formed.

As described above, in the dielectric resonator 1, the second frequency adjusting hole 7 of the first frequency adjusting hole 6 extending in the direction orthogonal to each other in order to adjust the resonance frequency to the required band.
(And the dummy holes 8) must be formed.
Therefore, in order to integrally mold the ceramic portion of the dielectric resonator 1, the mold becomes complicated, which increases the cost and is time-consuming.

Therefore, this invention intends to provide a structure of a dielectric resonator capable of solving the above-mentioned problems.

[Means for Solving the Problems] The present invention is directed to a dielectric column and an actual current path in which both sides of the dielectric column facing each other and facing each other are formed as openings for coupling with another resonator. And a case for forming a dielectric resonator using a TM mode, which is directed to one side surface defined as the opening in order to solve the above-mentioned technical problem. In terms of
It is characterized in that a notch extending in a direction intersecting the length direction of the dielectric pillar is formed.

[Operation and Effect of Device] According to this device, the notch can function as the second frequency adjusting hole 7 in the dielectric resonator 1 shown in FIG. Therefore, the second frequency adjusting hole 7 extending in the direction orthogonal to the first frequency adjusting hole 6 is formed.
Becomes unnecessary.

Further, since this notch is opened toward the opening of the case, it has a shape opened toward the usual mold releasing direction for integrally molding the ceramic portion of the dielectric resonator. Will be there. Moreover, the first shown in FIG.
When a hole corresponding to the frequency adjusting hole 6 is provided, this hole can also be formed so as to extend in the normal releasing direction. Due to this, the structure of the mold for integral molding can be simplified, and therefore cost and labor can be reduced.

The ceramic portion of the dielectric resonator according to the present invention is not limited to the one obtained by integral molding. Also,
As for the notch, a method may be adopted in which a die is provided with a shape corresponding to the notch and the shape is simultaneously formed at the time of molding, or the method is scraped off later. Even in this case, since the notch is open toward the opening of the case, it is easier to form such a notch than to form a hole.

[Embodiment] FIG. 1 is a perspective view showing an embodiment of the present invention.

The dielectric resonator 1a shown in FIG. 1 includes substantially the same elements as the dielectric resonator 1 shown in FIG. That is, the dielectric resonator 1a includes a dielectric column 2a and an opening 3a for positioning the dielectric column 2a inside and opposing side surfaces for coupling with another resonator (only one is shown. The case 4a described above is provided. The dielectric columns 2a and the case 4a are made of a ceramic material and are preferably obtained by integral molding. A conductive film is formed on the inner surface and / or the outer surface of the case 4a in order to give a real current path to the case 4a made of a ceramic material. In this embodiment, the conductive film is formed on both the inner surface and the outer surface of the case 4a. 5a is formed.

In this embodiment, as compared with the case of the dielectric resonator 1 shown in FIG. 2, the dielectric columns 2a are arranged shifted to the side closer to the opening 3a. Moreover, the predetermined surface 9 of the dielectric pillar 2a having a prismatic shape facing the opening 3a side forms an angle θ of, for example, 20 to 30 degrees with respect to the end surface 10 of the case 4a defining the opening 3a. Slanted to.

The dielectric column 2a has a first frequency adjusting hole 6a for adjusting the resonance frequency with a relatively large width, and the case 4a.
For example, it is provided so as to extend parallel to the side surface 11. In addition, a notch 12 extending in a direction intersecting the length direction of the dielectric pillar 2a is formed on the predetermined surface 9 of the dielectric pillar 2a. The notch 12 has the same function as the second frequency adjusting hole 7 shown in FIG. 2, and is for fine adjustment of the resonance frequency.

The ceramic part of such a dielectric resonator 1a is
Including the frequency adjusting hole 6a and the notch 12, it can be easily formed by integral molding. However, for example, the notch 12 may be formed not by the molding step but by scraping it later. When the cutout 12 is formed by cutting off later, the dummy cutout 13 may be formed on the side surface 11 of the case 4a depending on the shape of the tool for cutting off. However, it is preferable that the dummy notch 13 is not formed as deep as possible. This is because, if the dummy notch 13 is deeply formed, not only the strength of the case 4a is reduced, but also the electromagnetic field is greatly leaked. As previously mentioned,
When the dielectric pillar 2a is displaced toward the opening 3a side and the predetermined surface 9a is provided with an angle θ, the notch for frequency adjustment is formed without forming the dummy notch 13 so deeply.
It becomes possible to form 12 at a desired depth.

Although the present invention has been described above with reference to the illustrated embodiment, the following modifications are possible within the scope of the present invention.

For example, the dielectric pillar 2a may be, for example, a cylinder instead of a prism.

In addition, the dielectric pillar 2a may be provided in the case 4a in the state of being aligned with the end surface of the case 4a without being displaced or slanted.

Further, the dummy notch 13 may not be intentionally formed as long as it is possible to avoid forming the notch 12 when forming the notch 12.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a perspective view showing a dielectric resonator 1 for explaining a technique related to the present invention. In the figure, 1a is a dielectric resonator, 2a is a dielectric column, 3a is an opening, 4a is a case, 5a is a conductive film, 6a is a first frequency adjusting hole, 9 is a predetermined surface, and 12 is a notch. is there.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Sadao Yamashita 2 26-10 Tenjin Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Takashi Takagaki 2 26-10 Tenjin Tenjin, Nagaokakyo, Kyoto Prefecture Stock Company Murata Manufacturing

Claims (1)

[Scope of utility model registration request] 1. A dielectric pillar, and a case in which the dielectric pillar is located inside and opposite side surfaces form an actual current path which is an opening for coupling with another resonator. In the dielectric resonator using the TM mode, a notch extending in a direction intersecting the length direction of the dielectric pillar is formed on a predetermined surface of the dielectric pillar facing one side surface defined as the opening. A dielectric resonator characterized by the above.