JPS62137901A - Dielectric resonator - Google Patents

Abstract

PURPOSE:To eliminate the need for re-adjustment after the assembling in a case by arranging a conductor plate onto an open end face separately while one part of the open end face of a dielectric resonance element is opened externally and enclocking the opened part by the case. CONSTITUTION:An L-shaped angle steel is used as the conductor plate 2, and while a side plate 23 is parted from the open end face 11a of a dielectric block, a bottom plate 24 is fixed along an outer conductor 15 of one side face of the dielectric block and mounting pieces 25-led from the end ridge of the side plate 23 are fixed to the outer conductor 15 of the other side face of the dielectric block. Then the open end face 11a of the dielectric block is opened externally through the gaps 26... of the mounting pieces 25 so that the characteristic of the dielectric resonance element is adjusted from the gaps 26.... The gaps 26... are enclosed by the resonator case 3 after the characteristic adjustment of the dielectric resonance element is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dielectric resonator used for applications such as microwave filters, and particularly to improvements in its exterior structure.

In the case of conventional resonators, it is necessary to adjust the characteristics such as the resonant frequency and the degree of coupling between each resonant unit. There are various methods for making these adjustments, such as inserting a metal bottle into the through hole of the resonant element, or providing a dielectric block on the open end surface of the resonant element. If the electromagnetic field distribution situation in the cutoff area changes due to the influence of the case, there is a problem that the characteristics adjustment may have to be made again.

Therefore, as a means to solve this problem, the present applicant proposed a structure in which a metal pin for adjusting the characteristics of the resonant element is attached to a metal case for incorporating the resonant element, as proposed in Utility Application No. 60-86225. proposed in.

According to this structure, the resonance characteristics can be adjusted while the resonant element is assembled in the metal case, so there is no need to make any adjustments, which is very convenient.

Standing J is about to play 1 cup.

By the way, the characteristics of the resonator can be adjusted sufficiently in any case by means of the above-mentioned metal bottle, but in reality, it is possible to adjust the characteristics by means other than the metal bottle, for example, by using a small lump of dielectric material on the open end surface of the resonator element. In some cases, it may be necessary to make adjustments by providing a dielectric, scraping off the dielectric, or slightly extending a conductive rod on the outer periphery of the dielectric to the open end surface.

However, when the various characteristics of the resonant element are adjusted by means other than metal pins, there is a problem that when the resonant element is assembled into a case, it is inevitably affected by the case, and therefore readjustment must be performed.

In view of these problems, the present invention aims to provide a dielectric resonator with high utility value, which eliminates the need for readjustment after being assembled into a case when the characteristics are adjusted before being assembled into the case. There is.

In order to achieve the above object, the present invention provides a conductor in which a part of the open end surface of a dielectric resonant element is left open to the outside so that the characteristics of the resonant element can be adjusted from the outside. The resonator is characterized in that the plates are spaced apart from each other on the open end surface, and the open portion is closed by a resonator case or a shielding material.

FIG. 1 is an exploded perspective view of a dielectric resonator according to an embodiment of the present invention, FIG. 2 is a 1+J plane view of the resonator, and FIG.
The figure shows the AA cross section Lv1 in FIG. 2, where 1 is an I dielectric resonant element, 2 is a conductive plate, and 3 is a resonator case.

The dielectric resonant element 1 has a circular through hole 12 inside a ceramic dielectric block 11 made of titanium oxide, for example.
... and square-shaped coupling holes 13 ... are formed alternately, and a conductive film 14 (hereinafter, this conductive film is referred to as an inner conductor) is formed on the inner surface of the receiving hole 12 .... A conductive film 16 in which a conductive film 15 (hereinafter, this conductive film is referred to as an outer conductor) is formed on the four outer surfaces of the dielectric block 11, and the inner and outer cylindrical conductors 14 and 15 are formed on the bottom surface of the dielectric block 11. It has a short-circuited structure. A resonant unit is constituted by the inner and outer cylindrical conductors 14 and 15 and the dielectric block surrounded therebetween. In this embodiment, since there are four Ni111 holes 12 . . . , four resonance units are formed in one dielectric block 11 . Adjacent resonant units are electromagnetically coupled through coupling holes 13 . The degree of coupling of each unit can be determined by a known method such as inserting a dielectric block into the coupling hole 13, or providing an electrostatic coupling electrode on the open end surface 11a of the upper surface of the dielectric block 11 where no conductive film is formed. It can be adjusted using the following method.

Each of the resonant units resonates at wavelength A since the inner conductor 14 and outer conductor 15 are short-circuited by the conductive film 16 underlying the dielectric block 11. The resonant frequency is determined by the dielectric constant of the dielectric block 11 and the length of the inner conductor 14. However, it is possible to adjust the resonance frequency by providing a dielectric block on the open end surface, extending the outer conductor 15, or cutting it in the longitudinal direction of the dielectric block 11. M through holes on both sides 12.
12, an external coupling capacitor 18 is connected to the open end via a metal column-shaped coupling member 17, and the conductor plate 2, which will be described later,
It is designed to be connected to an external circuit (not shown) via lead pins 42 of a connector 41 provided in the figure.

In the illustrated example, the resonance units are coupled to each other through the coupling holes 13, but other known means may be used. Also, the resonant wavelength of the resonant unit is A as shown in the example.
It does not matter if it is a wavelength (or a % wavelength). In that case, the conductive film 16 on the bottom surface of the block 11 is unnecessary.

In the illustrated example, the conductor plate 2 is the open end surface 1 of the dielectric block 11.
It has a cap shape that covers the entire surface of 1a at regular intervals, and connectors 41 are provided on the side plates 2a on both sides in the longitudinal direction. On the other hand, openings 21 are formed at appropriate intervals on one side surface 2b perpendicular to the longitudinal direction. Each opening 21
. . . adjusts the characteristics of the resonant element by providing a dielectric block on the open end surface 11a of the dielectric block, extending electrodes from the outer conductor 15, or cutting them, etc. using a specified device from outside. It is formed relatively large so that it can be conveniently inserted. However, opening 21...
If it is too large, the effect of covering the open end surface 11a of the dielectric block with the conductive plate 2 will be weakened, so it is set to an appropriate size to maintain this effect. Also, the opening 21...
The formation position is also near the through hole and the coupling hole to facilitate the various characteristic adjustment operations described above. Each opening 21
After adjusting the properties of the resonator 7.1, the resonator 7.1 is electromagnetically closed by pasting a shielding tape 22 or the like. The conductor plate 2 having this configuration has its top plate 2C separated from the open end surface 11a of the dielectric block.
Soldering the lower edge of each side plate 2a, 2b to the outer conductor 15 of the dielectric block 11;
It is fixed at 1.

The resonator case 3 is for covering the lower half of the dielectric block 11 which cannot be covered by the conductor plate 2. However, as shown in the illustrated example, if all four sides and the entire bottom surface of the dielectric block 11 are sealed with conductive films 15 and 16,
Case 3 is not necessarily necessary.

According to this configuration, since the openings 21 are formed in the conductor plate 2, after the conductor plate 2 is provided to cover the open end surface of the dielectric block 11, the open end surface is 11a is provided with a small dielectric material, or the outer conductor 15 is
The resonant frequency and the degree of coupling between the resonant units can be adjusted by extending or cutting off the electrodes toward the inner conductor. That is, the characteristics of the resonant element can be adjusted in a state where the resonant element is equivalently placed in a metal case. Therefore, the characteristic adjustment only needs to be performed once, and the adjustment work can be performed quickly and smoothly.

Next, FIG. 4 shows another embodiment of the present invention. In this embodiment, an L-shaped angle member is used as the conductor plate 2, and with the upright plate part 23 separated from the open end surface 11a of the dielectric block, the bottom plate part 24 is connected along the outer conductor 15 on the side surface of the dielectric block. Further, mounting pieces 25 extending from the edge of the upright plate portion 23 are fixed to the outer conductor 15 on the other side of the dielectric block. By opening the open end surfaces of the dielectric blocks to the outside through the gaps 26 between the mounting pieces 25, the characteristics of the resonant element can be adjusted through the gaps 26. The gap 26...
・After adjusting the characteristics of the resonant element, resonator case 5
occluded by However, it may be closed with a shielding material as in the first embodiment.

It should be noted that the conductor plate 2 may be of any type as long as it can realize a state in which a resonant element is equivalently housed in a metal case, and it goes without saying that the structure is not limited to the structure of each of the above embodiments. Further, the resonant element 1 does not have a plurality of through holes as in each of the above embodiments, but may be a so-called dielectric 1'S coaxial resonator having a medium through hole. Furthermore, not only a dielectric resonator that is a combination of a plurality of resonators, but also a dielectric resonator that is composed of only - resonators is considered a dielectric resonator according to the present invention.

As explained above, in the present invention, the characteristics of the resonant element can be adjusted in the same state as when the resonant element is equivalently placed in a metal case, so there is no need for readjustment as in the conventional case.
Since only one adjustment is required, the adjustment work can be done easily and quickly.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a dielectric resonator as an embodiment of the present invention, Fig. 2 is a perspective view of the resonator in an assembled state, and Fig. 3 is a cross section taken along line AA in Fig. 2. 4 are perspective views showing another embodiment of the present invention. 1... Dielectric resonant element, lla... Open end surface 2.-
・Conductor plate, 22... Shielding material 3... Resonator case Patent applicant Murata Risakusho Co., Ltd. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] A part of the open end surface of the dielectric resonant element is open to the outside so that the characteristics of the resonant element can be adjusted from the outside, and a conductive plate is arranged at a distance on the open end surface, and the open part is A dielectric resonator characterized in that it is closed by a resonator case or a shielding material.