JPH0744363B2 - Dielectric resonator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator of TM ₀₁₀ mode or its modified _mode , which is used for, for example, a dielectric filter.

[0002]

2. Description of the Related Art As shown in FIG. 3 , for example, a conventional dielectric filter has a cavity case in order to prevent a temperature characteristic from being deteriorated by matching a linear expansion coefficient with a dielectric pillar 2 made of, for example, ceramic. The entire space 4 is made of ceramic having the same or substantially the same linear expansion coefficient as the dielectric pillar 2, and is housed in a metal case (not shown). Reference numeral 4a is a partition for adjusting coupling, and 6 is a conductive film for forming an actual current path.

By the way, if the cavity case is made of metal and the dielectric column 2 is soldered to it, in addition to the above-mentioned problem of deterioration of temperature characteristics, due to a Jule loss or the like at the soldered portion,
There is also a problem that the Q of the resonator is greatly reduced.

[0004]

However, a dielectric filter having a multistage dielectric resonator in which the entire cavity case 4 is made of ceramic as described above is a cavity having a size corresponding to the number of resonator stages. Although the case 4 is required, the workability of the assembly is poor because the ceramic plate is warped, and it becomes difficult to join the case when the case is large, and the case 4 is large for making the cavity case 4. Since a ceramic plate is required, the material cost is high, and as a result, there is a problem that the cost is high.

Therefore, the present invention is excellent in temperature characteristics and the like, and moreover, a dielectric filter and the like can be easily constructed , and further, electromagnetic coupling with other dielectric resonators and the like is simple.
It is a primary object of the present invention to provide an induction body resonator that has the coupling factor and that can be easily adjusted .

[0006]

To achieve the above object, according to an aspect of, the ceramic dielectric resonator of the present invention, the upper and lower surfaces and at least one side closed vital least one side is Ru <br/> not open Ke - a scan to that provided a conductive film forming the actual current path on the surface, the ceramic Ke - and be in the scan with one disposed between the upper and lower surfaces dielectric columns, before
At least one of the open sides of the ceramic case
Is also located in one of the open areas
And a conductive partition plate for partitioning a part .

[0007]

According to the above construction, since the dielectric columns are arranged in the ceramic case, the temperature characteristic is good unlike the case where the metal case is used, and the surface of the ceramic case has no actual characteristics. Since the conductive film forming the current path is provided, the Q is also high. Moreover, since this dielectric resonator is, so to speak, unitized, by appropriately combining it, a dielectric filter or the like can be easily constructed without using a large cavity case made of ceramic as in the conventional case. be able to. Also, at least one of the ceramic cases
Since the side part is open, other parts are
Just by bringing the dielectric resonator etc. closer, the facing part
No special coupling means such as an excitation rod is required
It can be electromagnetically coupled to other dielectric resonators.
Wear. Therefore, the structure is simplified and other dielectric materials are used.
Coupling work with a resonator or the like becomes extremely simple. Besides,
Conductive partition plate that partitions part of the open part of the
Since this is equipped with this partition plate,
The degree of coupling can be easily adjusted.

[0008]

1 is a perspective view showing an example of a dielectric resonator according to the present invention.

This dielectric resonator 10 is a rectangular box-shaped ceramic case 14 made of ceramics having upper and lower surfaces and two side surfaces. In this example, a conductive film 16 is formed on the entire surface by silver baking or the like. In the formed one, more specifically, between the upper and lower surfaces thereof, one cylindrical dielectric pillar 12 which is originally different from the ceramic case 14 and is made of ceramic in this example is arranged. This constitutes a resonator of TM ₀₁₀ mode. In this case, the actual current path is formed by the conductive film 16 on the surface of the ceramic case 14.

Ceramic case 14 of this dielectric pillar 12
Is fixed by, for example, applying silver paste to the upper and lower end surface portions thereof and baking the same together with the conductive film 16 on the surface of the ceramic case 14.

The ceramic case 14, in this example, is
Open the two sides (ie the front and back of the paper)
In this example, the two sides that are open are
A partition plate for adjusting the connection that partitions a part of the mouth
14a is provided. This partition plate 14a is made of a conductive material.
For example, the same silver baking as the ceramic case 14
May be made of attached ceramic plate or metal plate
You can make it with.

The dielectric resonator 10 is a ceramic case.
Since the dielectric columns 12 are arranged in the space 14, the metal case
The temperature characteristics are good, unlike when using a glass. Dielectric column 12
If the material of the ceramic case 14 is made the same as that of the ceramic case 14 to eliminate the difference in linear expansion coefficient between the two, the temperature characteristics will be further improved. Further, since the conductive film 16 forming an actual current path is provided on the surface of the ceramic case 14, the loss is small and the Q is high.

Further , this dielectric resonator 10 is a ceramic resonator.
Since the two sides of the case 14 are open,
Just bring other dielectric resonators close to the part you are talking about
Then, through the open part, a special
Electromagnetically coupled with other dielectric resonators without the need for coupling means.
Can be combined physically. Therefore, the structure is simplified
Connection work with other dielectric resonators is also extremely difficult.
It will be easy. Moreover, a part of the open part
Since it has a conductive partition plate 14a for partitioning,
The partition plate 14a makes it easy to achieve the degree of electromagnetic coupling described above.
Can be adjusted to.

Moreover, since the dielectric resonator 10 is, so to speak, unitized, it is possible to easily combine the dielectric resonators 10 with each other without using a large ceramic cavity case as in the conventional case. Can be configured. An example thereof is shown in FIG .

In the dielectric filter shown in FIG. 2, a plurality of the dielectric resonators 10 shown in FIG. 1 are arranged side by side in a metal case 24, and the dielectric resonators 10 adjacent to each other are arranged above and below ( (The lower side is not shown in the figure) For example, a thin plate 20 such as a silver-plated metal foil is suspended, and the conductive film 16 and each conductive film 16 are soldered with solder 22 to thereby connect between the adjacent dielectric resonators 10. It is electrically connected to form a multistage dielectric filter. In FIG. 2, the metal case 24
The portion corresponding to the lid of is not shown.

According to the above structure , the ceramic case 14 is opened between the adjacent dielectric resonators 10.
Predetermined electromagnetic coupling is generated through the existing portion , whereby a dielectric filter having predetermined characteristics is obtained.

Moreover, since the dielectric resonator 10 is so-called unitized and housed in the metal case 24, the workability of assembly is improved and a large ceramic plate is used as a cavity case as in the conventional case. Material cost is reduced because there is no need to use it, and as a result, significant cost reduction can be expected. Of course, the dielectric column 12 is not soldered to the metal cavity, and since the actual current path is effectively formed by the conductive film 16 as described above, the Q of the resonator is lowered. There is no problem.

It should be noted that the side plates of the ceramic case 14 constituting the dielectric resonator 10 do not necessarily have to be two as in the above example, and may be one , or in the case of one located at the end. You can have three.

Further , the partition plate 14a is a ceramic case.
At least one of the open sides of the sleeve 14
It should be installed in.

It is sufficient that the conductive film 16 on the surface of the ceramic case 14 can form at least an actual current path therethrough, and as in the above example, the ceramic case 1 is not always necessary.
It is not necessary to provide it on all surfaces of No. 4.

The cross-sectional shape of the dielectric pillar 12 may be arbitrary. For example, the dielectric column 12 may have a prismatic shape.

The mode of the dielectric resonator 10 is TM
A modified _{mode of 010} mode may be used.

[0023]

As described above, in the dielectric resonator of the present invention, since the dielectric columns are arranged in the ceramic case, the temperature characteristic is good unlike the case of using the metal case.
Further, since a conductive film forming an actual current path is provided on the surface of the ceramic case, Q is also high.

Moreover, since this dielectric resonator is so-called unitized, it is possible to easily combine the dielectric resonators with each other without using a large cavity case made of ceramic as in the conventional case. Etc. can be configured. That is, when this dielectric resonator is used, the workability of assembling the dielectric filter and the like is improved, and the material cost is reduced because a large ceramic plate is not required, resulting in a significant cost reduction of the dielectric filter and the like. Can be expected.

Further, the dielectric resonator of the present invention is a ceramic resonator.
At least one side of the case is open
, Bring other dielectric resonators, etc. close to the open part.
Just by kicking, the excitation rod etc. can be passed through the opening.
Other dielectric resonators without the need for special coupling means
Etc. can be electromagnetically coupled. Therefore, the structure is
Simplified and coupled with other dielectric resonators
Is also extremely easy. Moreover, of the open part
Since it has a conductive partition plate to partition a part,
The partition plate makes it easy to adjust the degree of electromagnetic coupling.
Can be arranged.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a dielectric resonator according to the present invention.

FIG. 2 is a perspective view showing an example of a dielectric filter using the dielectric resonator of FIG. 1 with a part cut away.

FIG. 3 is a cross-sectional view partially showing an example of a conventional dielectric filter.

[Explanation of symbols]

10 Dielectric Resonator 12 Dielectric Column 14 Ceramic Case 14a Partition Plate 16 Conductive Film

Claims (1)

[Claims] 1. A only have the top and bottom surfaces and at least one side
One that has at least one side is open ceramic Ke -
Which is provided with a conductive film for forming an actual current path on its surface, one dielectric pillar arranged in the ceramic case and between the upper and lower surfaces thereof, and the ceramic case.
On at least one of the open sides of the
A guide that is placed and partitions a part of the opening.
A dielectric resonator comprising: an electrically conductive partition plate .