CN114335935A - Dielectric filter - Google Patents

Abstract

The present disclosure provides a dielectric filter, the dielectric filter includes a dielectric cavity and an antenna board assembly, the outer surface of the dielectric cavity is a conductive surface, and the antenna board assembly has a first surface and a second surface opposite to the first surface , the dielectric filter also includes a casing, the casing includes a casing body with a first accommodating cavity and a plurality of connecting pieces formed on the casing body, the dielectric cavity is arranged in the first accommodating cavity of the casing body, and the antenna plate The first surface of the component faces the medium cavity, the antenna board component is formed with a plurality of connection holes, each connection hole corresponds to at least one connecting piece, the connecting hole penetrates the antenna board component along the thickness direction of the antenna board component, and the connecting piece includes a connecting part and a snap portion, one end of the connecting portion is connected with the housing body, the other end of the connecting portion is connected with the snap portion, the connecting portion passes through the corresponding connecting hole and is in contact with the second surface of the antenna board assembly. The medium cavity will not fail due to expansion stress.

Description

dielectric filter

technical field

The present invention relates to the field of communication equipment, in particular, to a dielectric filter.

Background technique

With the development of communication technology, the competitiveness of communication equipment is mainly reflected in the aspects of small size, light weight and low cost. As an important part of the antenna-feeder system, dielectric filters have also evolved to ceramic dielectric filters as the main form.

Shown in FIG. 1 is a dielectric filter, which includes a dielectric cavity 110, a metal needle 120, a filter backing plate 130, and an antenna plate 140, wherein the dielectric cavity 110 is made of ceramic material, and The outer surface of the dielectric cavity 110 is metallized, and the metal pins 120 realize the conduction of electromagnetic signals between the antenna board 140 and the dielectric cavity 110 . The dielectric cavity 110 is integrally welded on the antenna liner 130 , and the antenna liner 130 and the antenna board 140 are soldered and surface-mounted, and the metal pins 120 are welded to the microstrip line on the antenna board 140 to achieve signal conduction.

However, in the process of using the dielectric filter shown in FIG. 1 , the problem of damage to the dielectric filter and product performance failure may occur.

SUMMARY OF THE INVENTION

The present disclosure provides a dielectric filter, the dielectric filter includes a dielectric cavity and an antenna board assembly, the outer surface of the dielectric cavity is a conductive surface, the antenna board assembly has a first surface and a a second surface opposite to the surface, wherein the dielectric filter further includes a housing, the housing includes a housing body having a first accommodating cavity and a plurality of connecting pieces formed on the housing body, the dielectric cavity The body is disposed in the first accommodating cavity of the housing body, the first surface of the antenna board assembly faces the medium cavity, and the antenna board assembly is formed with a plurality of connection holes, each of which corresponds to at least one connecting piece, the connecting hole penetrates the antenna board assembly along the thickness direction of the antenna board assembly, the connecting piece includes a connecting part and a buckle part, one end of the connecting part is connected with the shell body, The other end of the connecting portion is connected to the snap portion, and the connecting portion passes through the corresponding connecting hole and is in contact with the second surface of the antenna board assembly.

Optionally, the dielectric filter further includes a plurality of conductive needles, the conductive needles include a conductive cap, an elastic member and a conductive column, a second accommodating cavity is formed in the conductive cap, and the elastic member is disposed on the In the second accommodating cavity, one end of the conductive column is connected to the elastic member, the other end of the conductive column is electrically connected to the antenna board assembly, and the conductive column is electrically connected to the conductive cap;

The conductive pins are provided in both the input port and the output port of the medium cavity, the conductive cap is electrically connected to the conductive surface, and the conductive column is electrically connected to the signal strip line of the antenna board assembly.

Optionally, the dielectric filter further includes a plurality of shielding conductive members, each of the conductive needles corresponds to the shielding conductive member, the shielding conductive members are arranged on the periphery of the corresponding conductive needles, and the shielding conductive members It is arranged between the first surface of the antenna board assembly and the dielectric cavity to electrically connect the conductive surface of the dielectric cavity with the grounding area of the antenna board assembly, and the shielding conductive member is connected to the Signal stripline insulation spacing on the antenna board assembly described above.

Optionally, the shielding conductive member has elasticity.

Optionally, the shielding conductive member is made of conductive glue; or the shielding conductive member is made of an elastic metal sheet.

Optionally, the casing includes a casing bottom plate and a casing side wall, the casing side wall is arranged around the casing bottom plate to enclose the first accommodating cavity, and the connecting portion is formed on the The side wall of the casing is on a surface facing away from the bottom plate of the casing, and the bottom plate of the casing is opposite to the bottom surface of the medium cavity.

Optionally, the housing further includes a positioning post, and the positioning post is arranged on a surface of the side wall of the housing away from the bottom plate of the housing,

The antenna board assembly further includes a positioning hole corresponding to the positioning column, and the positioning column is inserted into the positioning hole.

Optionally, the side wall of the casing includes a side wall body and a rib formed on the inner surface of the side wall body, and the rib is attached to the side surface of the medium cavity.

Optionally, at least one pair of notches and grooves is further provided on the side wall of the casing, and at least one of the connecting pieces corresponds to the pair of notches and grooves,

The pair of notched grooves includes two notched grooves, wherein one of the notched grooves is located on one side of the corresponding connecting piece, and the other notched groove is located on the other side of the corresponding connecting piece.

Optionally, the antenna board assembly includes a stacked antenna board and an antenna reflection board, and the antenna board is provided toward the dielectric cavity.

In the dielectric filter provided by the present disclosure, the dielectric cavity is connected with the antenna board assembly through the connecting piece provided on the casing, instead of connecting the dielectric cavity with the antenna board assembly by welding. When the dielectric filter assembly is used in an ambient temperature that varies between -40°C and 120°C, even if the expansion coefficients of the dielectric cavity and the antenna board assembly 300 are different, the dielectric cavity and the antenna board assembly 300 will not be in contact with each other. Expansion stress is formed between the two, and the dielectric cavity or the antenna board assembly will not be damaged, and the signal conduction between the dielectric cavity and the antenna board assembly will not be damaged.

Description of drawings

1 is a schematic structural diagram of a dielectric filter in the related art;

2 is a schematic cross-sectional view of the first embodiment of the dielectric filter provided by the present disclosure;

3 is a schematic main cross-sectional view of a second embodiment of the dielectric filter provided by the present disclosure;

4 is a schematic three-dimensional structural diagram of an embodiment of a medium cavity;

Fig. 5 is the main sectional schematic diagram of an embodiment of the conductive needle;

FIG. 6 is a schematic three-dimensional structure diagram of an embodiment of the housing;

FIG. 7 is a schematic exploded perspective view of the second embodiment of the dielectric filter provided by the present disclosure.

Description of reference numerals

110: medium cavity 120: metal needle

130: Filter backing plate 140: Antenna plate

200: Shell 210: Shell body

211: Housing bottom plate 212: Housing side wall

211a: Weight reduction hole 212a: Side wall body

212b: Rib 222: Buckle

220: Connector 221: Connector

300: Antenna Board Assembly 310: Antenna Board

320: Antenna reflector 300a: Connection hole

310a: first connection hole 320a: second connection hole

310b: first positioning hole 320b: second positioning hole

230: Positioning post 400: Conductive pin

410: Conductive cap 420: Elastic

430: Conductive Post 500: Shielded Conductor

Detailed ways

In order for those skilled in the art to better understand the technical solutions of the present disclosure, the dielectric filter provided by the present disclosure will be described in detail below with reference to the accompanying drawings.

Example embodiments are described more fully hereinafter with reference to the accompanying drawings, but which may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Various embodiments of the present disclosure and various features of the embodiments may be combined with each other without conflict.

As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The terminology used herein is used to describe particular embodiments only and is not intended to limit the present disclosure. As used herein, the singular forms "a" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that when the terms "comprising" and/or "made of" are used in this specification, the stated features, integers, steps, operations, elements and/or components are specified to be present, but not precluded or Add one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be construed as having meanings consistent with their meanings in the context of the related art and this disclosure, and will not be construed as having idealized or over-formal meanings, unless expressly so limited herein.

For dielectric filters, the dielectric cavity is usually made of ceramic materials. The temperature of the operating environment of the dielectric filter varies from -40°C to 120°C, while the expansion coefficient of the ceramic material is relatively small (4-10PPM). The expansion coefficient of the board is relatively large (>12PPM), so there is a large expansion stress between the antenna board and the dielectric cavity, which will cause the dielectric filter made of ceramic to crack, or the solder between the antenna liner and the antenna board. cracking, resulting in the failure of the dielectric filter.

In view of this, the present disclosure provides a dielectric filter, as shown in FIG. 2 and FIG. 3 , the dielectric filter includes a dielectric cavity 110 and an antenna board assembly 300 . The outer surface of the dielectric cavity 110 is a conductive surface, and the antenna board assembly 300 has a first surface and a second surface opposite to the first surface. The dielectric filter further includes a housing 200 . The housing 200 includes a housing body 210 having a first accommodating cavity and a plurality of connecting pieces 220 formed on the housing body 210 . in the first accommodating cavity. The first surface of the antenna board assembly 300 faces the dielectric cavity 110 , a plurality of connection holes 300 a are formed on the antenna board assembly 300 , each connection hole 300 a corresponds to at least one connecting piece 220 , and the connection holes 300 a are along the The thickness direction runs through the antenna board assembly 300 . The connecting member 220 includes a connecting portion 221 and a snap portion 222. One end of the connecting portion 221 is connected to the housing body 210, and the other end of the connecting portion 221 is connected to the snap portion 222. The connecting portion 221 passes through the corresponding connecting hole 300a and is connected to the housing body 210. The second surfaces of the antenna board assembly 300 are in contact.

It should be noted that there is signal conduction between the dielectric cavity 110 and the antenna board assembly 300 . In the dielectric filter provided by the present disclosure, the dielectric cavity 110 and the antenna board assembly 300 are connected through the connecting member 220 provided on the casing, instead of connecting the dielectric cavity 110 and the antenna board assembly 300 by welding. When the dielectric filter assembly is used in an ambient temperature that varies between -40°C and 120°C, even if the expansion coefficients of the dielectric cavity 110 and the antenna board assembly 300 are different, the dielectric cavity 110 and the antenna board will not interact with each other. Expansion stress is formed between the components 300 , and the dielectric cavity 110 or the antenna board assembly will not be damaged, and the signal conduction between the dielectric cavity 110 and the antenna board assembly 300 will not be damaged.

When assembling the dielectric filter, it is only necessary to set the dielectric cavity 110 in the first accommodating cavity of the casing 200 , and then align the connecting piece 220 with the corresponding connecting hole 300 a to realize the casing 200 and the antenna board assembly 300 The card can be connected in between. Compared with the related art in which the connection between the dielectric cavity 110 and the antenna board is realized by welding, the dielectric filter provided by the present disclosure is easier to assemble.

Since there are no solder joints between the dielectric cavity 110 and the antenna board assembly 300 during use, when the dielectric filter is repaired, it is only necessary to withdraw the connecting piece 220 from the connecting hole 300a to connect the dielectric filter. The casing is removed to realize the disassembly of the dielectric filter without melting the solder joints at high temperature, thereby improving the maintenance efficiency and reducing the maintenance cost.

In order to facilitate installation, the material of the casing 200 should have elasticity, and similarly, in order to realize the function of the dielectric filter, the casing 200 should be insulated. Accordingly, the housing 200 may be made of plastic.

In the present disclosure, the specific structure of the medium cavity 110 is not particularly limited. As an optional embodiment, the dielectric cavity 110 includes a ceramic body and a conductive layer disposed on the outer surface of the ceramic body, that is, the outer surface of the dielectric cavity 110 is a conductive surface. In the present disclosure, there is no particular limitation on how to form the conductive layer on the outer surface of the ceramic body. For example, the outer surface of the ceramic body can be metallized by means of plating to obtain the conductive layer.

"Each connection hole 300a corresponds to at least one connection piece 220" includes the following two cases: in the first case, one connection hole 300 corresponds to one connection piece 220; in the second case, one connection hole 300 corresponds to multiple connection pieces 220. In any case, the connecting portion 221 of the connecting piece 220 passes through the connecting hole 300a corresponding to the connecting piece, so as to realize the fixed connection between the housing 200 and the antenna board assembly 300 by the snap portion 222, and finally realize the medium cavity Connection of the body 110 to the antenna board assembly 300 .

In the present disclosure, signal conduction between the dielectric cavity 110 and the antenna board assembly 300 needs to be achieved. Specifically, both the input port and the output port of the dielectric cavity 110 need to be electrically connected to the signal stripline of the antenna board assembly.

It should be noted that the input port and the output port of the medium cavity 110 are both blind holes formed on the medium cavity 110 , and the surfaces of the input port and the output port are both conductive surfaces.

FIG. 5 shows an embodiment of a medium cavity 110 . As shown in the figure, an input port 111 and an output port 112 are formed on the medium cavity 110 . In addition, the dielectric cavity 110 is also formed with structures such as coupling and debugging grooves, tuning frequency holes, and the like.

In order to realize the signal conduction between the input port and the output port of the dielectric cavity 110 and the antenna board, optionally, the dielectric filter further includes a plurality of conductive pins 400 , as shown in FIG. 4 , the conductive pins 400 include conductive pins 400 . The cap 410, the elastic member 420 and the conductive column 430. A second accommodating cavity is formed in the conductive cap 410. The elastic member 420 is arranged in the second accommodating cavity. One end of the conductive column 430 is connected to the elastic member 420. The other end is electrically connected to the antenna board assembly, and the conductive post 430 is electrically connected to the conductive cap 410 .

In the present disclosure, there is no particular limitation on how to form an electrical connection between the conductive pillar 430 and the conductive cap 410 . For example, the outer surface of the conductive pillar 430 may be in contact with the surface of the second receiving cavity to form an electrical connection between the conductive pillar 430 and the conductive cap 410 . In order to ensure that an electrical connection can be formed between the conductive post 430 and the conductive cap 410 , optionally, the elastic member 420 can be made of a conductive material, and one end of the elastic member 420 is fixedly connected to the conductive cap 410 and the other end is fixed to the conductive post 430 connect. Also, the elastic member 420 should be in a compressed state to ensure close contact between the conductive post 430 and the signal stripline. In the present disclosure, the outer surfaces of the conductive pins 400 may be plated with copper or silver to better realize signal transmission.

Both the input port and the output port of the dielectric cavity 110 are provided with conductive pins 400 , the conductive cap 410 is electrically connected to the conductive surface, and the conductive post 410 is electrically connected to the signal strip line on the antenna board assembly 300 to realize the dielectric cavity 110 Signal conduction between the input port and the output port of the antenna board assembly 300 and the signal strip line on the antenna board assembly 300 .

In the present disclosure, the specific structure of the elastic member 420 is not particularly limited. For example, the elastic member 420 may be a metal spring or a metal elastic sheet.

By arranging the conductive pins 400 with the elastic members 420, the input port of the dielectric cavity 110 and the signal conduction between the output port and the antenna board can be realized, and there is no need to set up a filter backing plate or welding, thereby further avoiding the antenna board. Component failed due to soldering.

In the related art, the dielectric cavity of the finished dielectric filter and the antenna board assembly are formed as a whole by welding the filter backing plate. When assembling a dielectric filter, it is necessary to first debug the dielectric filtering performance of the dielectric cavity and change the structure of the dielectric cavity without welding between the dielectric cavity and the antenna board assembly. When the dielectric cavity reaches the required performance, the dielectric cavity and the antenna board assembly that meet the performance are welded together through the filter backing plate. This results in the inconsistency between the debugging environment (the dielectric cavity and the antenna board assembly are not welded) and the use environment of the dielectric filter (the dielectric cavity and the antenna board assembly are welded through the filter backing plate) when debugging the dielectric filter. That is to say, a dielectric filter that meets the performance requirements of the debugging environment may not necessarily meet the real use environment of the dielectric filter.

In the dielectric filter provided by the present disclosure, due to the elasticity of the conductive pins 400, when debugging the filter, the signal conduction between the antenna board assembly 300 and the dielectric cavity 110 can be realized without welding, and the filter can be debugged. The actual debugging environment and the actual use environment of the filter are benchmarked, which can eliminate the index difference between the debugging index and the real use environment, and the dielectric filter that meets the performance requirements in the debugging environment can also meet the performance requirements in the use environment. Therefore, compared with the dielectric filter in the related art, the dielectric filter provided by the present disclosure has better performance.

In order to achieve signal shielding, optionally, the dielectric filter further includes a plurality of shielding conductive members 500 , each conductive pin 400 corresponds to the shielding conductive member, and the shielding conductive member 500 is disposed on the periphery of the corresponding conductive needle 400 , the shielding conductive member 500 is disposed between the first surface of the antenna board assembly 300 and the dielectric cavity 110 to electrically connect the conductive surface of the dielectric cavity 110 with the grounding area of the antenna board assembly 300. It should be noted that the shielding conductive The member 500 is insulated from the signal strip lines on the antenna board assembly 300 .

In order to achieve close contact between the shielded conductive member 500 and the conductive surface of the dielectric cavity 110 and the grounding area of the antenna board assembly 300 , optionally, the shielded conductive member 500 has elasticity and is in a compressed state.

In order to facilitate the setting, as an optional implementation manner, the shielding conductive member 500 may be made of conductive glue. For example, the shielded conductive member 500 can be made of strip-shaped or sheet-shaped conductive adhesive. The conductive adhesive mainly includes a resin matrix and conductive particles dispersed in the resin matrix. The resin matrix mainly includes epoxy resin, acrylate resin, polychloride and so on. The conductive adhesive requires that the conductive particles themselves have good conductivity and the particle size should be within a suitable range, and can be added to the resin matrix to form a conductive path. The conductive particles can be made from any of gold, silver, copper, aluminum, zinc, iron, nickel powders and graphite and some conductive compounds.

Of course, the present disclosure is not limited thereto, and the shielding conductive member 500 may also be made of a conductive elastic metal sheet.

In the present disclosure, the specific structure of the casing 200 is not particularly limited. As shown in FIG. 2 , FIG. 3 , and FIG. 6 , the casing 200 includes a casing bottom plate 211 and a casing side wall 212 . 212 is arranged around the casing bottom plate 211 to enclose the first accommodating cavity, the connecting portion 220 is formed on the surface of the casing side wall 212 facing away from the casing bottom plate 211 , and the casing bottom plate 211 is opposite to the bottom surface of the medium cavity 110 .

As described above, the case 200 may be made of plastic, and thus, the case 200 may be formed through an injection molding process.

In order to facilitate installation, optionally, the housing further includes a positioning post 230, and the positioning post 230 is disposed on the surface of the side wall of the housing away from the bottom plate 211 of the housing. Correspondingly, the antenna board assembly 300 further includes a The positioning holes corresponding to the positioning posts 230 are inserted into the corresponding positioning holes 230 . When assembling the housing 200 , the medium cavity 110 and the antenna board assembly 300 , align the positioning posts 230 with the corresponding positioning holes, and then insert the housing to realize the connection between the housing and the antenna board assembly 300 . In addition, the positioning post 230 can also play the role of auxiliary connection, reduce the lateral external force on the connecting piece 220 under the vibration environment, and prevent the opening of the connecting piece 220 from coming out of the connecting hole.

In the embodiment shown in FIG. 6 , the housing 200 includes two positioning columns 230 , of course, the present disclosure is not limited thereto, and more positioning columns 230 may also be provided.

In order to improve the strength of the housing 200 and facilitate putting the medium cavity 110 into the first accommodating cavity of the housing 200, optionally, the side wall 212 of the housing may include a side wall body 212a and a side wall body 212a formed in the side wall body 212a. The rib 212b on the surface is in contact with the side surface of the medium cavity 110 .

In the housing 200, only the rib 212b is in contact with the side surface of the medium cavity 110, therefore, the contact area between the housing 200 and the medium cavity 100 is small, thereby facilitating the removal of the medium cavity 110 from the first accommodating cavity take out. Also, providing the ribs 212b can also improve the strength of the housing 200 .

In order to facilitate the manufacture of the casing 200 , optionally, at least one weight reduction hole is formed on at least one of the casing side wall 212 and the casing bottom plate 211 .

For example, in the embodiment shown in FIG. 6 , weight reduction holes 211 a are formed on the bottom plate 211 of the casing, and weight reduction holes are also formed on the side walls of the casing.

When the housing 200 and the antenna board assembly 300 are assembled together, a force needs to be applied to the connecting member 220 so that the connecting member 220 is elastically deformed, so that the snap portion 222 can pass through the connecting hole 300 a, and at the snap portion 222 After passing through the connecting hole 300a, it can be restored to the original state and be stuck on the second surface of the antenna board assembly 300. In order to facilitate the elastic deformation of the connecting piece 220 to facilitate assembly, optionally, the thickness of the connecting portion of the connecting piece 220 is smaller than the thickness of the side wall body 212a.

As shown in FIG. 6 , the thickness of the connecting portion 221 is approximately half of the thickness of the sidewall body 212a.

In order to further increase the elastic deformation of the connecting portion 221 , optionally, at least one pair of notches and grooves is further provided on the side wall 212 of the casing, and at least one connecting piece 220 corresponds to the pair of notches and grooves, and the pair of notches and grooves includes two Notched grooves, one of the notched grooves is located on one side of the corresponding connector 220 , and the other notched groove is located on the other side of the corresponding connector.

After the notch groove is provided, the rigidity of the connecting piece 220 can be reduced, so that the connecting piece 220 can be elastically deformed.

In the specific embodiment shown in FIG. 6 , four connectors 220 are provided on the housing 200 , wherein two connectors 220 are provided with pairs of notches and grooves correspondingly, and corresponding connectors with pairs of notches and grooves are provided 220 is arranged on the opposite side walls of the housing, so that the two can be deformed synchronously when the dielectric filter is assembled. In order to improve the strength of the casing 200, optionally, the pair of notches and grooves are not provided on the other two side walls of the casing.

In the present disclosure, the antenna board assembly 300 is also not particularly limited. As an optional implementation manner, the antenna board assembly 300 may be a single-layer structure. As shown in FIG. 2 , the connecting hole 300a directly penetrates the single-layer antenna board assembly, and the snap portion 222 is snapped on the antenna board assembly.

As another optional implementation manner of the present disclosure, as shown in FIG. 3 , the antenna board assembly 300 may include a stacked antenna board 310 and an antenna reflection board 320 , and the antenna board 310 is positioned toward the dielectric cavity. The connection hole 300 a penetrates the antenna plate 310 and the antenna reflection plate 320 , and the opening portion 222 is clamped on the antenna reflection plate 320 .

Specifically, as shown in FIG. 7 , a first connection hole 310 a is formed on the antenna plate 310 , a second connection hole 320 a is formed on the antenna reflector 320 , and the first connection hole 310 a and the second connection hole 320 b communicate with each other to form a connection hole 300 a .

Correspondingly, as shown in FIG. 7 , the positioning holes may also include a first positioning hole 310b penetrating the antenna plate 310 and a second positioning hole 320b penetrating the antenna radiating plate 320 .

The dielectric filter can be assembled in the manner shown in FIG. 7 : the dielectric cavity 110 is clamped into the housing 200 , and the dielectric cavity 110 is clamped on the housing 200 including the antenna plate 310 and the antenna reflector through the connection part on the housing 200 . In the connection hole of the antenna component of the board 320, the conductive pin 400 is in close contact with the signal strip line on the antenna board 310 to realize signal conduction, and the shielded conductive member 500 around the conductive pin 400 is in close contact with the grounding area on the antenna board 310 to achieve Ground shield.

Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should only be construed in a general descriptive sense and not for purposes of limitation. In some instances, it will be apparent to those skilled in the art that features, characteristics and/or elements described in connection with a particular embodiment may be used alone or in combination with other embodiments, unless expressly stated otherwise. Features and/or elements are used in combination. Accordingly, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present disclosure as set forth in the appended claims.

Claims (10)

1. A dielectric filter comprising a dielectric cavity and an antenna board assembly, the outer surface of the dielectric cavity is a conductive surface, and the antenna board assembly has a first surface and a The opposite second surface is characterized in that the dielectric filter further includes a casing, the casing includes a casing body having a first accommodating cavity and a plurality of connecting pieces formed on the casing body, the dielectric The cavity is arranged in the first accommodating cavity of the housing body, the first surface of the antenna board assembly faces the medium cavity, and a plurality of connection holes are formed on the antenna board assembly, each of the connection holes Corresponding to at least one connecting piece, the connecting hole penetrates the antenna board assembly along the thickness direction of the antenna board assembly, the connecting piece includes a connecting part and a buckle part, and one end of the connecting part is connected with the shell body , the other end of the connecting portion is connected with the snap portion, the connecting portion passes through the corresponding connecting hole and is in contact with the second surface of the antenna board assembly. 2 . The dielectric filter according to claim 1 , wherein the dielectric filter further comprises a plurality of conductive pins, the conductive pins comprise a conductive cap, an elastic member and a conductive column, and the conductive cap is formed with a second accommodating cavity, the elastic member is disposed in the second accommodating cavity, one end of the conductive column is connected to the elastic member, the other end of the conductive column is electrically connected to the antenna board assembly, and the the conductive column is electrically connected to the conductive cap; The conductive pins are provided in both the input port and the output port of the medium cavity, the conductive cap is electrically connected to the conductive surface, and the conductive column is electrically connected to the signal strip line of the antenna board assembly. 3 . The dielectric filter according to claim 1 , wherein the dielectric filter further comprises a plurality of shielded conductive parts, each of the conductive pins corresponds to the shielded conductive parts, and the shielded conductive parts The shielding conductive member is arranged on the periphery of the corresponding conductive pin, and the shielding conductive member is arranged between the first surface of the antenna board assembly and the dielectric cavity, so as to connect the conductive surface of the dielectric cavity with the antenna board assembly. The grounding area is electrically connected, and the shielding conductive member is insulated from the signal strip line on the antenna board assembly. 4 . The dielectric filter according to claim 3 , wherein the shielding conductive member has elasticity. 5 . 5 . The dielectric filter according to claim 4 , wherein the shielding conductive member is made of conductive glue; or the shielding conductive member is made of an elastic metal sheet. 6 . 6 . The dielectric filter according to claim 1 , wherein the casing comprises a casing bottom plate and a casing side wall, and the casing side wall is arranged around the casing bottom plate. 7 . , so as to enclose the first accommodating cavity, the connecting portion is formed on the surface of the side wall of the casing facing away from the bottom plate of the casing, and the bottom plate of the casing is opposite to the bottom surface of the medium cavity. 7 . The dielectric filter according to claim 6 , wherein the housing further comprises a positioning column, and the positioning column is arranged on a surface of the side wall of the housing facing away from the bottom plate of the housing, 8 . The antenna board assembly further includes a positioning hole corresponding to the positioning column, and the positioning column is inserted into the positioning hole. 8 . The dielectric filter according to claim 6 , wherein the side wall of the housing comprises a side wall body and a rib formed on the inner surface of the side wall body, and the rib is connected to the dielectric cavity. 9 . Side surface fit. 9 . The dielectric filter according to claim 6 , wherein at least one pair of notches and grooves is further provided on the side wall of the casing, and at least one of the connecting pieces corresponds to the pair of notches and grooves, 10 . The pair of notched grooves includes two notched grooves, one of the notched grooves is located on one side of the corresponding connecting piece, and the other notched groove is located on the other side of the corresponding connecting piece. 10. The dielectric filter according to any one of claims 1 to 5, wherein the antenna board assembly comprises an antenna board and an antenna reflector that are arranged in layers, and the antenna board is arranged toward the dielectric cavity .

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