WO2021043099A1

WO2021043099A1 - Capacitance coupling structure, dielectric filter, communication antenna, and base station

Info

Publication number: WO2021043099A1
Application number: PCT/CN2020/112443
Authority: WO
Inventors: 伍隽; 闫松凌; 苏柯铭; 莫辉海
Original assignee: 深圳顺络电子股份有限公司
Priority date: 2019-09-02
Filing date: 2020-08-31
Publication date: 2021-03-11
Also published as: CN210468049U

Abstract

Disclosed is a capacitance coupling structure of a dielectric filter, the capacitance coupling structure comprising a solid dielectric body, at least two first blind holes used for adjusting resonant frequency are arranged on the solid dielectric body, each of the first blind holes and solid dielectric filling the position around the corresponding first blind hole form a dielectric resonator, a negative coupling structure for realizing capacitive coupling of the two dielectric resonators is arranged between two adjacent first blind holes, the negative coupling structure comprises a second blind hole and an open slot that are provided in the solid dielectric body, at least one of the two ends of the open slot is of an open structure, and the surface of the solid dielectric body, the surfaces of the first blind holes, the surface of the second blind hole and the surface of the open slot are all covered with conductor metal layers. Further disclosed are a dielectric filter, a communication antenna, and a communication base station. The capacitance coupling structure provided in the utility model solves the problem that capacitance coupling between dielectric resonators is difficult, and simplifies the structure and the manufacturing process of a dielectric filter.

Description

Capacitive coupling structure, dielectric filter, communication antenna and base station

Technical field

The utility model relates to the field of communication technology, in particular to a capacitive coupling structure, a dielectric filter, an antenna, and a base station.

Background technique

With the rapid development of modern wireless communications, more stringent requirements are placed on the overall performance of base station filters. Metal coaxial cavity filters and dielectric cavity filters are two common filters for base stations. The use of various resonators to design various new hybrid technologies and multi-band filters have been extensively studied in the past few years. Different from the common coaxial metal cavity, the dielectric resonator filter is to fix the excellent performance dielectric resonator on the low dielectric constant support column and put it into a closed metal cavity. The dielectric resonator is filled with air. . The size of the entire cavity is related to the number, size, and type of resonators used. The dielectric resonators are coupled to each other through a certain topological arrangement inside the cavity.

With the rapid increase in the capacity requirements of contemporary communication systems, the requirements for filters and duplexers used in base stations have become more stringent. In order to achieve the characteristics of high selectivity and large capacity, the cavity filter needs to introduce a cross-coupling structure to achieve higher out-of-band suppression. Only by using the cross-coupling effect of the resonator to obtain the transmission zero (TZ) can the increasingly stringent performance requirements be met.

The existing solid dielectric filter has a relatively difficult capacitive coupling and a relatively complicated structure. In the dielectric filter disclosed in the patent application CN201380046875.9, a negative coupling hole with a depth twice the depth of the debugging hole is arranged between the debugging holes of the two resonators, which solves the difficult problem of capacitive coupling, but this structure It is very difficult to process a deep blind hole on the solid medium body, and it is easy to produce waste. And because the depth of the blind hole is very deep and the diameter is small, it is quite difficult to plate the metal layer on the surface of the blind hole. It is difficult to ensure the uniformity of the metal layer, which affects the strength of capacitive coupling and the performance of the dielectric filter.

Utility model content

In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a capacitive coupling structure to solve the problems of difficult capacitive coupling between dielectric resonators and difficult processing of the capacitive coupling structure.

In order to achieve the above objectives, the technical solutions adopted by the present utility model are specifically as follows:

The capacitive coupling structure includes a solid dielectric body, the solid dielectric body is provided with at least two first blind holes for adjusting the resonance frequency, and the first blind hole and the solid medium filled around the first blind hole form one In a dielectric resonator, a negative coupling structure for capacitive coupling of two dielectric resonators is provided between two adjacent first blind holes;

The negative coupling structure includes a second blind hole and an opening slot provided on the solid medium body, the second blind hole and the two first blind holes are on the same surface, and the second blind hole is deep The depth of the shallow blind hole is smaller than that of the first blind hole; the opening groove is located on the solid medium body on the back of the second blind hole, and opens on the back surface of the second blind hole. The two ends of the opening groove have at least One end is an open structure;

The surface of the solid medium body, the surface of the first blind hole, the surface of the second blind hole and the surface of the opening groove are all covered with a conductive metal layer.

As a further preferred solution, the depth of the second blind hole of the present invention is less than or equal to half of the depth of the first blind hole.

As a further preferred solution, the central axis of the second blind hole described in the present invention intersects perpendicularly with the central axis of the opening groove.

As a further preferred solution, both ends of the open slot described in the present invention are both open structures.

As a further preferred solution, the shape of the end surface of the opening structure at both ends of the opening groove of the present invention is one of a rectangle, a square, a parallelogram, a trapezoid, and a "U" shape.

As a further preferred solution, the two ends of the open slot described in the present invention have an internal opening structure, so that the open slot forms a through slot with openings on three sides.

As a further preferred solution, the solid medium described in the present utility model is one of ceramics, sapphire, quartz stone, and polymer.

The utility model also provides a dielectric filter, which includes the capacitive coupling structure of the utility model.

The utility model also provides a wireless communication antenna, which includes the dielectric filter of the utility model.

The utility model also provides a communication base station, which includes the wireless communication antenna described in the utility model.

Compared with the prior art, the beneficial effects of the present invention are:

1. The capacitive coupling structure of the present invention is provided with a negative coupling structure on the solid dielectric body. By forming a blind hole on the solid dielectric body, and implementing a slot design on the back of the blind hole, the capacitive coupling between the dielectric resonators is effectively solved Difficult and difficult to process the capacitive coupling structure.

2. The negative coupling structure of the present utility model adopts the blind hole and slot design, which can control the depth of the second blind hole. Under this design, the second blind hole adopts a shallow blind hole that is easy to process. The processing technology is simple, the scrap rate is reduced, and the metal layer is plated on the surface of the blind hole and the uniformity of the metal layer can be ensured, thereby improving the performance of the dielectric filter.

3. The negative coupling structure of the present utility model adopts the blind hole and slot design to further reduce the weight of the dielectric filter body, which is beneficial to the miniaturization and lightness of the communication base station.

The above description is only an overview of the technical solution of the present utility model. In order to understand the technical means of the present utility model more clearly, it can be implemented in accordance with the content of the specification, and in order to make the above and other objectives, features and advantages of the present utility model better. It is obvious and easy to understand, the following is a detailed description of the preferred embodiments in conjunction with the accompanying drawings.

Description of the drawings

Figure 1 is a three-dimensional view of the capacitive coupling structure of the utility model;

Figure 2 is a front view of the capacitive coupling structure of the utility model;

Figure 3 is a cross-sectional view taken along line A-A of Figure 1;

4 is a bottom view of Embodiment 1 of the capacitive coupling structure of the utility model;

5 is a bottom view of Embodiment 2 of the capacitive coupling structure according to the present invention;

Among them, the reference signs are: 1. solid medium; 11, the first blind hole; 12, the second blind hole; 13, the open slot.

detailed description

In order to further explain the technical means and effects of the present utility model to achieve the intended purpose of the utility model, the specific implementation, structure, features and effects of the present utility model will be described in detail below with reference to the drawings and preferred embodiments. as follows:

As shown in Figures 1 to 3, in Embodiment 1 of the present invention, the capacitive coupling structure of the solid medium includes a solid medium body 1. At least two adjustments are provided on the solid medium body 1. A first blind hole 11 with a resonance frequency. The first blind hole 11 and the solid medium 1 filled around the first blind hole 11 form a dielectric resonator, and two adjacent first blind holes 11 are provided There is a negative coupling structure for capacitive coupling of two dielectric resonators;

The negative coupling structure includes a second blind hole 12 and an opening groove 13 arranged on the solid medium body 1, the second blind hole 12 and the two first blind holes 11 are on the same surface, and the first The second blind hole 12 is a shallow blind hole with a depth less than the depth of the first blind hole 11; the opening groove 13 is located on the solid medium body 1 on the back of the second blind hole 11 and on the back of the surface where the second blind hole 12 is located. An opening, at least one of the two ends of the opening groove 13 is an opening structure;

The surface of the solid dielectric body 1, the surface of the first blind hole 11, the surface of the second blind hole 12 and the surface of the opening groove 13 are all covered with a conductive metal layer. In the structure of this solution, due to the open slot structure, the open slot and the second blind hole form a negative coupling structure. In such a solution, the second blind hole can be processed into a shallow blind hole, which is opposite to the deep blind hole on the one hand. , It is easier to implement and the process is easy to control, which can effectively reduce the scrap rate; on the other hand, the process of implementing a metal layer on the surface of the shallow blind hole is also simpler, and the obtained metal layer has better uniformity, ensuring the capacitive coupling structure and Performance in dielectric filters. However, it is relatively easy to perform the process of slotting on the solid medium (such as ceramics, quartz stone, etc.) relative to the process of opening holes. Therefore, the process of manufacturing the entire dielectric filter can be further optimized. In this embodiment, the principle of controlling the capacitive coupling strength is achieved by controlling the thickness of the solid medium between the open slot and the second blind hole. The greater the thickness of the solid medium between the open slot and the second blind hole, the greater the coupling strength. The smaller the thickness, the greater the coupling strength.

On the basis of the above-mentioned embodiment 1, further, in the embodiment 2 of the present invention, the depth of the second blind hole 12 can be half of the depth of the first blind hole 11, or even smaller. , The method of forming the second blind hole is simpler and more convenient.

Since the second blind hole as a negative coupling structure forms a coupling capacitor with the open slot and the solid medium in it, the size of the capacitive coupling is related to the aperture and depth of the second blind hole. The larger the aperture or the deeper the blind hole, the stronger the coupling strength. Large, in order to achieve the same coupling strength, and to ensure that the second blind hole is easy to process and shape. On the basis of the foregoing embodiment 1 or embodiment 2, further, in embodiment 3 of the present invention, the diameter of the second blind hole is greater than or equal to the diameter of the first blind hole.

On the basis of the above-mentioned embodiment 1 or embodiment 2 or embodiment 3, further, in embodiment 3 of the present invention, the transverse cross-sectional shape of the first blind hole 11 and the second blind hole 12 is circular , Ellipse or any polygon with more than 3 sides (for example, triangle, quadrilateral, pentagon, hexagon, etc.). The central axis of the second blind hole 12 and the central axis of the opening groove 13 of the present invention intersect perpendicularly.

On the basis of the above-mentioned embodiment 1 or embodiment 2 or embodiment 3, as a further preferred solution, both ends of the open groove 13 described in the present invention are both open structures. The shape of the end surface of the opening structure at both ends of the opening slot 13 of the present invention is one of rectangle, square, parallelogram, trapezoid, and "U" shape, but it is not limited to the above. Others that can achieve the same function can also be selected. shape. A more preferred structure is an open slot with a "U"-shaped or square-shaped end surface, and when the "U"-shaped end surface structure is provided with a conductive metal layer on the surface of the open slot, the implementation is the easiest and the conductive metal layer is the most uniform.

In order to further make the open groove easy to process and shape, as shown in FIG. 5, on the basis of the above-mentioned embodiment 1 or embodiment 2 or embodiment 3, further, in embodiment 4 of the present invention, the The two ends of the opening groove are divided into internal opening structures, so that the opening groove forms a through groove with openings on three sides.

On the basis of the foregoing embodiment 1 to embodiment 4, further, as a further preferred solution, the solid medium of the present invention is selected from but not limited to ceramics, sapphire, quartz, polymers, etc. commonly used in the field. The solid medium with the same function of the utility model.

The above-mentioned embodiments are only preferred embodiments of the present utility model, and cannot be used to limit the scope of protection of the present utility model. Any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model belong to The scope of protection required by the utility model.

Claims

The capacitive coupling structure includes a solid dielectric body, wherein at least two first blind holes for adjusting the resonance frequency are provided on the solid dielectric body, and the first blind hole and the surrounding first blind hole are filled The solid medium forms a dielectric resonator, and a negative coupling structure for capacitive coupling of the two dielectric resonators is arranged between two adjacent first blind holes;

The negative coupling structure includes a second blind hole and an opening slot provided on the solid medium body, the second blind hole and the two first blind holes are on the same surface, and the second blind hole is deep A shallow blind hole smaller than the depth of the first blind hole; the opening groove is located on the solid medium body on the back of the second blind hole and opens on the back of the solid medium body on the surface where the second blind hole is located. At least one of the two ends is an open structure;

The surface of the solid medium body, the surface of the first blind hole, the surface of the second blind hole and the surface of the opening groove are all covered with a conductive metal layer.
The capacitive coupling structure according to claim 1, wherein the depth of the second blind hole is less than or equal to half of the depth of the first blind hole.
The capacitive coupling structure according to claim 1, wherein the aperture of the second blind hole is greater than or equal to the aperture of the first blind hole.
The capacitive coupling structure according to claim 1, wherein the central axis of the second blind hole and the central axis of the opening slot perpendicularly intersect.
The capacitive coupling structure according to claim 1, wherein both ends of the open slot are open structures.
The capacitive coupling structure according to claim 4, wherein the shape of the end surface of the opening structure at both ends of the opening slot is one of a rectangle, a square, a parallelogram, a trapezoid, and a "U" shape.
The capacitive coupling structure according to claim 1, wherein the two ends of the opening slot are divided into internal opening structures, so that the opening slot forms a three-sided opening through slot.
The capacitive coupling structure according to claim 1, wherein the solid medium is one of ceramic, sapphire, quartz stone, and polymer.
A dielectric filter, characterized in that it comprises the capacitive coupling structure according to any one of claims 1-8.
A wireless communication antenna, characterized in that it comprises the dielectric filter according to claim 9.
A communication base station, characterized in that it comprises the wireless communication antenna of claim 10.