CN111584981A

CN111584981A - Dielectric filter

Info

Publication number: CN111584981A
Application number: CN202010420148.6A
Authority: CN
Inventors: 何坚兵
Original assignee: Gospell Digital Technology Co ltd
Current assignee: Chenzhou Gongtian Electronic Ceramics Technology Co ltd
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2020-08-25
Anticipated expiration: 2040-05-18
Also published as: CN111584981B

Abstract

The invention relates to a dielectric filter, which comprises a filter main body with a square structure, wherein a plurality of resonant cavities are arranged on the front surface of the filter main body, and at least part of the inner walls of the resonant cavities are obliquely arranged towards the inside of the filter main body; the front surface of the filter main body is provided with a plurality of coupling cavities, and at least part of inner walls of the coupling cavities are obliquely arranged towards the inside of the filter main body. The efficiency of eliminating the metal level is improved, if manual debugging can make the debugging more convenient, if mechanical equipment debugging, can make the structure of mechanical debugging simpler.

Description

Dielectric filter

Technical Field

The invention relates to the technical field of electronic devices, in particular to an improved dielectric filter.

Background

The dielectric filter is a microwave device which adopts dielectric materials as electromagnetic wave transmission media and realizes the frequency selection function through the multi-stage coupling of a resonant cavity. The surface of the dielectric filter is metallized, so that electromagnetic waves are transmitted in the dielectric filter, and the dielectric filter has the advantages of small volume, rapid batch production and convenient debugging. However, there is a problem in the debugging process because the cavity is a blind hole structure, and the frequency selection characteristic of the dielectric filter is changed mainly by eliminating the metal at the bottom and the side wall of the blind hole in the debugging process. It is easier to eliminate the metal layer at the bottom of the blind via, but grinding the blind via sidewall can be difficult. There are two current methods of eliminating the bottom metal, one is to use a grinding head and the other is to use a laser. Both of these methods have difficulty in effectively eliminating the sidewall metal.

Disclosure of Invention

The invention aims to provide a dielectric filter.

The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a dielectric filter, which comprises a filter main body with a square structure, wherein a plurality of resonant cavities are arranged on the front surface of the filter main body, and at least part of the inner walls of the resonant cavities are obliquely arranged towards the inside of the filter main body;

the front surface of the filter main body is provided with a plurality of coupling cavities, and at least part of inner walls of the coupling cavities are obliquely arranged towards the inside of the filter main body.

Preferably, the resonator inner walls are all disposed obliquely towards the interior of the filter body;

the inner walls of the coupling cavities are all obliquely arranged towards the interior of the filter body.

Preferably, the number of the resonant cavities is eight, the resonant cavities are divided into two rows, and four resonant cavities in each row are uniformly arranged at intervals;

the two coupling cavities are respectively arranged between the two resonant cavities close to the edge of the filter main body.

Preferably, an isolation groove is further arranged between the coupling cavities;

the isolation groove is including locating positive central point of wave filter main part puts and perpendicular and follows the first isolation groove that wave filter main part length direction extends to and axial symmetry locates a pair of second isolation groove of first isolation groove both sides.

Preferably, the section of the first isolation groove is in a long strip-shaped structure;

the second isolation groove comprises a vertical end which is parallel to the first isolation groove and is positioned between the outermost side and the secondary outer side of the resonant cavity, and a transverse end which is vertically connected with the vertical end and is back to the coupling cavity in an extending mode.

Preferably, the first isolation groove and the second isolation groove penetrate the filter body.

Preferably, the back of the filter main body is further provided with a signal input hole and a signal output hole.

Preferably, the inner wall of the resonant cavity, the inner wall of the coupling cavity, the inner wall of the isolation groove, the signal input hole and the signal output hole are all covered with metal layers.

Preferably, the filter body outer surface is covered with a metal layer.

The implementation of the invention has the following beneficial effects: the resonant cavity and the inner wall of the coupling cavity of the dielectric filter are obliquely arranged to form a structure with a large opening and a small inside, when various performance parameters of the dielectric filter need to be adjusted, the metal layer covered by the inner wall of the dielectric filter can be eliminated through the grinding head or laser, the efficiency of eliminating the metal layer is improved, the debugging can be more convenient if manual debugging is carried out, and the structure for mechanical debugging can be simpler if mechanical equipment is debugged.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic front view of a dielectric filter according to the present invention;

figure 2 is a side cross-sectional view of a dielectric filter of the present invention;

fig. 3 is a schematic diagram of the back structure of the dielectric filter of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.

It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

As shown in fig. 1-3, the dielectric filter of the present invention includes a filter body 1 with a square structure, such as a rectangular parallelepiped structure or a square structure, the material may be ceramic, and the structural form, material and size may be selected according to actual requirements, which is not limited specifically herein.

Furthermore, a plurality of resonant cavities 2 are arranged on the front surface of the filter body 1, at least part of inner walls of the resonant cavities 2 are inclined towards the inside of the filter body 1 and are contracted towards the inside of the filter body 1 to form a structure with a large opening and a small inside, and of course, the inner walls of the resonant cavities 2 can be all inclined towards the inside of the filter body 1 to form a cavity with a truncated cone structure.

Furthermore, a plurality of coupling cavities 3 are arranged on the front surface of the filter main body 1, at least part of inner walls of the coupling cavities 3 are obliquely arranged towards the interior of the filter main body 1 and are contracted towards the interior of the filter main body 1 to form a structure with a large opening and a small interior, and of course, all inner walls of the coupling cavities 3 can be obliquely arranged towards the interior of the filter main body 1 to form a cavity with a truncated cone structure.

In this embodiment, the number of the resonators 2 is eight, and the resonators are divided into two rows, and four intervals of each row are uniformly arranged along the length direction of the filter body 1. For example, the first row comprises a resonant cavity 21, a resonant cavity 22, a resonant cavity 23 and a resonant cavity 24 which are arranged at intervals in sequence, and the second row comprises a resonant cavity 25, a resonant cavity 26, a resonant cavity 27 and a resonant cavity 28 which are arranged at intervals in sequence.

The two coupling cavities 3 are respectively arranged between two of the resonant cavities 2 close to the edge of the filter body 1, such as a coupling cavity 31 and a coupling cavity 32, specifically, the coupling cavity 31 is between the resonant cavity 21 and the resonant cavity 25, and the coupling cavity 32 is between the resonant cavity 24 and the resonant cavity 28.

Further, the front surface of the filter body 1 is also provided with isolation grooves, and further, isolation grooves 4 are arranged between the coupling cavities 3.

The isolation groove 4 includes a first isolation groove 41 disposed at the center of the front surface of the filter body 1 and extending vertically along the length direction of the filter body 1, and a pair of second isolation grooves disposed at two sides of the first isolation groove 41 in an axisymmetrical manner, including a second isolation groove 42 and a second isolation groove 43. Furthermore, the first isolation groove 41 is disposed between the resonant cavity 22, the resonant cavity 23, the resonant cavity 26, and the resonant cavity 27, and the length direction thereof is parallel to a connection line (virtual line, not shown) between the resonant cavity 22 and the resonant cavity 26, and further, the cross section of the first isolation groove 41 is a long strip structure.

Further, the second isolation groove includes a vertical end disposed parallel to the first isolation groove 41 and located between the outermost and the next-to-outer resonant cavities, and a horizontal end perpendicularly connected to the vertical end and extending away from the coupling cavity 3. In the figure, the second isolation groove 42 is located between the resonant cavity 21, the resonant cavity 22, the coupling cavity 31, the resonant cavity 25 and the resonant cavity 26, and the second isolation groove 43 is located between the resonant cavity 23, the resonant cavity 24, the coupling cavity 33, the resonant cavity 27 and the resonant cavity 28.

Furthermore, the first isolation groove 41 and the second isolation groove have a certain depth, but do not penetrate through the filter body 1, and the coupling cavity 3 is a capacitive coupling cavity.

When the first isolation groove 41 and the second isolation groove penetrate through the filter body 1, the coupling cavity 3 is a magnetic coupling cavity.

Further, the back of the filter body 1 is provided with a signal input hole 51 and a signal output hole 52 for signal input and output, which are disposed substantially below the second isolation slot.

Further, the outer surface of the filter body 1 is covered with a metal layer. Furthermore, the inner walls of the resonant cavity 2, the coupling cavity 3, the isolation slot 4, the signal input hole 51 and the signal output hole 52 are covered with metal layers.

It can be understood that when the dielectric filter is not formed, the performance parameters of the dielectric filter can be adjusted by adjusting the sizes of the resonant cavity 2, the coupling cavity 3, the isolation slot 4, the signal input hole 51 and the signal output hole 52. However, when dielectric filter structures are formed, it is difficult to change these dimensions, which can be used to tune the performance parameters of the dielectric filter by eliminating the metal layer overlying these structures.

The utility model provides a dielectric filter's resonant cavity and the slope of coupling intracavity wall set up, form the big little structure in inside of opening, when each item performance parameter of needs adjustment dielectric filter, inside wall slope back, laser or bistrique all can eliminate the lateral wall metal level perpendicularly, improve the efficiency of eliminating the metal level, if manual debugging can make the debugging more convenient, if mechanical equipment debugs, can make the structure of mechanical debugging simpler.

It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A dielectric filter is characterized by comprising a filter main body with a square structure, wherein a plurality of resonant cavities are arranged on the front surface of the filter main body, and at least part of the inner walls of the resonant cavities are obliquely arranged towards the inside of the filter main body;

2. A dielectric filter as recited in claim 1, wherein the resonator internal walls are all disposed obliquely toward the filter body interior;

3. A dielectric filter as recited in claim 1 or 2, wherein the number of resonator cavities is eight, and the resonator cavities are divided into two rows, and four cavities are uniformly spaced in each row;

4. The dielectric filter of claim 3, wherein an isolation slot is further provided between the coupling cavities;

5. The dielectric filter of claim 4, wherein the first isolation groove has a cross section of a long strip structure;

6. The dielectric filter of claim 5, wherein the first isolation trench and the second isolation trench penetrate the filter body.

7. The dielectric filter of claim 6, wherein the filter body further includes a signal input hole and a signal output hole in the back surface.

8. The dielectric filter of claim 6, wherein the inner walls of the resonator, the inner walls of the coupling cavity, the inner walls of the isolation slot, the walls of the signal input hole and the signal output hole are covered with metal layers.

9. A dielectric filter as recited in claim 1, wherein the filter body outer surface is covered with a metal layer.