CN210516950U

CN210516950U - Dielectric filter comprising a capacitive coupling structure

Info

Publication number: CN210516950U
Application number: CN201921840363.0U
Authority: CN
Inventors: 徐华
Original assignee: Suzhou Haicida Material Technology Co Ltd
Current assignee: SUZHOU CHEERSSON PRECISION INDUSTRY Co.,Ltd.
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-05-12
Anticipated expiration: 2029-10-29

Abstract

The utility model discloses a dielectric filter who contains capacitive coupling structure, including dielectric filter body, first debugging hole and second debugging hole are for setting up two blind holes on dielectric filter body, the medium in first debugging hole and second debugging hole and the dielectric filter body forms two dielectric resonator, be equipped with a negative coupling hole between first debugging hole and the second debugging hole, the negative coupling hole is the step hole of compriseing a concentric through-hole and a blind hole, through-hole one end runs through dielectric filter body, and this end opening direction of this through-hole and the opening in first debugging hole and second debugging hole are located dielectric filter body same surface, the other end and the blind hole of through-hole are connected, the one end that the through-hole was kept away from to the blind hole is the blind end. The utility model discloses when realizing capacitive coupling, realized the control to the parasitic passband frequency of distal end.

Description

Dielectric filter comprising a capacitive coupling structure

Technical Field

The utility model relates to a dielectric filter who contains capacitive coupling structure belongs to the communication technology field.

Background

With the increasing development of wireless communication technology, wireless communication base stations are distributed more and more densely, the volume requirement of the base stations is smaller and smaller, wherein the volume ratio of a radio frequency front-end filter module in the base stations is larger, and therefore the volume requirement of the filter is smaller and smaller. However, when the volume of the metal coaxial cavity filter is reduced, it is found that: the smaller the filter volume, the higher the surface current, the higher the losses and the lower the power carrying capacity, i.e. the smaller the power capacity. That is, as the volume of the metal coaxial cavity filter is reduced, its performance index is deteriorated. At present, a miniaturized filter, that is, a solid dielectric filter is widely used, but a structure for realizing capacitive coupling (or called negative coupling) in the solid dielectric filter is complex, the process realization difficulty is high, and a parasitic passband is easily generated at a frequency close to the passband, so that how to provide a dielectric filter with a simple structure and low process difficulty becomes a research direction of a person skilled in the art.

Disclosure of Invention

The utility model aims at providing a dielectric filter who contains capacitive coupling structure, this dielectric filter who contains capacitive coupling structure can realize the control to the parasitic passband frequency of distal end when realizing capacitive coupling.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a dielectric filter containing a capacitive coupling structure comprises a dielectric filter body, a first debugging hole and a second debugging hole, the first debugging hole and the second debugging hole are two blind holes arranged on the dielectric filter body, the first debugging hole and the second debugging hole and the medium on the dielectric filter body form two dielectric resonators, a negative coupling hole is arranged between the first debugging hole and the second debugging hole, the negative coupling hole is a step hole consisting of a concentric through hole and a blind hole, one end of the through hole penetrates through the dielectric filter body, the opening direction of the end of the through hole and the openings of the first debugging hole and the second debugging hole are positioned on the same surface of the dielectric filter body, the other end and the blind hole of through-hole are connected, the blind hole is kept away from the one end of through-hole and is the blind end, all be equipped with the conducting layer on the inner wall of through-hole, blind hole and the step of being connected of through-hole and blind hole.

The further improved scheme in the technical scheme is as follows:

1. in the above scheme, the dielectric filter body is made of a non-metallic material.

2. In the above scheme, the first debugging hole and the second debugging hole are circular or elliptical in shape.

3. In the above scheme, the total depth of the through holes and the blind holes is greater than the depth of the first debugging holes and the second debugging holes.

4. In the above scheme, the conductive layer is made of copper or silver.

5. In the above scheme, the total depth of the through holes and the blind holes is 1.1-1.5 times of the depth of the first debugging holes.

6. In the above scheme, the conductive layer is attached to the surface of the dielectric filter body in a spraying, dipping, printing or electroplating manner.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:

1. the utility model discloses dielectric filter who contains capacitive coupling structure, when it realizes capacitive coupling, realized the control to the parasitic passband frequency of distal end.

2. The utility model discloses dielectric filter who contains capacitive coupling structure, its negative coupling hole adopts the combination of through-hole and blind hole, and the one end of blind hole is the blind end, and the press forming difficult problem of the too dark production in advantage for avoiding the negative coupling hole that this structure set up.

3. The utility model discloses dielectric filter who contains capacitive coupling structure, it all sets up the conducting layer advantage and does: the method is favorable for metallization process in the production process of the dielectric filter, and due to the existence of the upper conductive hole wall and the lower conductive hole wall, the debugging mode of the coupling hole is more flexible, the side wall of the upper through hole can be polished, the side wall and the bottom of the lower blind hole can also be polished, the coupling can be adjusted to be strong or weak, and the debugging passing rate is improved.

4. The utility model discloses dielectric filter who contains capacitive coupling structure, its total depth of through-hole and blind hole is 1.1~1.5 times of first debugging hole depth, and the through-hole diameter is about 1.1~2 times of blind hole diameter, and the larger the through-hole diameter is, the stronger its negative coupling intensity that forms is, otherwise the weaker; the larger the diameter of the blind hole is, the weaker the negative coupling strength is formed, and the stronger the negative coupling strength is formed. Through reasonable adjustment of the ratio of the two diameters, negative coupling in a larger intensity range can be formed flexibly, and the filter is suitable for narrow-band and wide-band dielectric filters. The arrangement of the structure can be used for controlling the strength of the negative coupling.

Drawings

Fig. 1 is a schematic structural diagram of a dielectric filter including a capacitive coupling structure according to the present invention.

In the above drawings: 1. a dielectric filter body; 2. a first pilot hole; 3. a second pilot hole; 4. a negative coupling aperture; 401. a through hole; 402. and (4) blind holes.

Detailed Description

In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.

Example 1: a dielectric filter containing a capacitive coupling structure comprises a dielectric filter body 1, a first debugging hole 2 and a second debugging hole 3, wherein the first debugging hole 2 and the second debugging hole 3 are two blind holes arranged on the dielectric filter body 1, the first debugging hole 2, the second debugging hole 3 and a medium on the dielectric filter body 1 form two dielectric resonators, a negative coupling hole 4 is arranged between the first debugging hole 2 and the second debugging hole 3, the negative coupling hole 4 is a step hole formed by a concentric through hole 401 and a blind hole 402, one end of the through hole 401 penetrates through the dielectric filter body 1, the opening direction of the end of the through hole 401 and the openings of the first debugging hole 2 and the second debugging hole 3 are positioned on the same surface of the dielectric filter body 1, the other end of the through hole 401 is connected with the blind hole 402, the end of the blind hole 402 far away from the through hole 401 is a closed end, and the inner walls of the through hole 401 and the blind hole 402 and the connecting step of the through hole 401 and the blind hole 402 are provided with conducting layers.

The dielectric filter body 1 is made of a non-metallic material.

The first and

second pilot holes

2 and 3 are formed in an elliptical shape.

The total depth of the through hole 401 and the blind hole 402 is greater than the depth of the first pilot hole 2 and the second pilot hole 3.

The conductive layer is made of silver.

The total depth of the through hole 401 and the blind hole 402 is 1.1 times the depth of the first pilot hole 2.

The conductive layer is attached to the surface of the dielectric filter body 1 by spraying.

Example 2: a dielectric filter containing a capacitive coupling structure comprises a dielectric filter body 1, a first debugging hole 2 and a second debugging hole 3, wherein the first debugging hole 2 and the second debugging hole 3 are two blind holes arranged on the dielectric filter body 1, the first debugging hole 2, the second debugging hole 3 and a medium on the dielectric filter body 1 form two dielectric resonators, a negative coupling hole 4 is arranged between the first debugging hole 2 and the second debugging hole 3, the negative coupling hole 4 is a step hole formed by a concentric through hole 401 and a blind hole 402, one end of the through hole 401 penetrates through the dielectric filter body 1, the opening direction of the end of the through hole 401 and the openings of the first debugging hole 2 and the second debugging hole 3 are positioned on the same surface of the dielectric filter body 1, the other end of the through hole 401 is connected with the blind hole 402, the end of the blind hole 402 far away from the through hole 401 is a closed end, and the inner walls of the through hole 401 and the blind hole 402 and the connecting step of the through hole 401 and the blind hole 402 are provided with conducting layers.

The first and

second pilot holes

2 and 3 are circular in shape.

The conductive layer is made of copper.

The total depth of the through hole 401 and the blind hole 402 is 1.5 times the depth of the first pilot hole 2.

The conductive layer is attached to the surface of the dielectric filter body 1 by electroplating.

When the dielectric filter comprising the capacitive coupling structure is adopted, the control on the frequency of the far-end parasitic passband is realized while the capacitive coupling is realized; its negative coupling hole adopts the combination of through-hole and blind hole, and the one end of blind hole is the blind end, and the advantage that this structure set up is the press forming difficult problem of avoiding the too dark production of negative coupling hole.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A dielectric filter comprising a capacitive coupling structure, characterized in that: the dielectric filter comprises a dielectric filter body (1), a first debugging hole (2) and a second debugging hole (3), wherein the first debugging hole (2) and the second debugging hole (3) are two blind holes arranged on the dielectric filter body (1), the first debugging hole (2) and the second debugging hole (3) and a medium on the dielectric filter body (1) form two dielectric resonators, a negative coupling hole (4) is arranged between the first debugging hole (2) and the second debugging hole (3), the negative coupling hole (4) is a stepped hole formed by a concentric through hole (401) and a concentric blind hole (402), one end of the through hole (401) penetrates through the dielectric filter body (1), the opening direction of the end of the through hole (401) and the openings of the first debugging hole (2) and the second debugging hole (3) are positioned on the same surface of the dielectric filter body (1), and the other end of the through hole (401) is connected with the blind hole (402), the blind hole (402) is far away from one end of the through hole (401) and is a closed end, and the inner walls of the through hole (401) and the blind hole (402) and the connecting steps of the through hole (401) and the blind hole (402) are provided with conducting layers.

2. A dielectric filter comprising a capacitive coupling structure according to claim 1, wherein: the dielectric filter body (1) is made of non-metal materials.

3. A dielectric filter comprising a capacitive coupling structure according to claim 1, wherein: the first debugging hole (2) and the second debugging hole (3) are circular or elliptical in shape.

4. A dielectric filter comprising a capacitive coupling structure according to claim 1, wherein: the total depth of the through hole (401) and the blind hole (402) is larger than the depth of the first debugging hole (2) and the second debugging hole (3).

5. A dielectric filter comprising a capacitive coupling structure according to claim 1, wherein: the conducting layer is made of copper or silver.

6. The dielectric filter including a capacitive coupling structure of claim 5, wherein: the total depth of the through hole (401) and the blind hole (402) is 1.1-1.5 times of the depth of the first debugging hole (2).

7. A dielectric filter comprising a capacitive coupling structure according to claim 1, wherein: the conducting layer is attached to the surface of the dielectric filter body (1) in a spraying, dipping, printing or electroplating mode.