CN115842264A

CN115842264A - Inter-board radio frequency connector and signal transmission device

Info

Publication number: CN115842264A
Application number: CN202111098494.8A
Authority: CN
Inventors: 王玉梅; 高飞; 吕福庭; 蔡树涛
Original assignee: Shenzhen Samsung Electronics Telecommunication Co Ltd; Samsung Electronics Co Ltd
Current assignee: Shenzhen Samsung Electronics Telecommunication Co Ltd; Samsung Electronics Co Ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2023-03-24

Abstract

The application discloses an inter-board radio frequency connector and a signal transmission device, which are used for being electrically connected between two circuit boards and comprise an inner conductor, an outer conductor and an insulating medium positioned between the inner conductor and the outer conductor, wherein the inner conductor is a metal elastic needle which has elastic deformation along the axial direction under the pressing of external force, and the axial direction of the inner conductor is vertical to the two circuit boards; the outer conductor comprises a first cylinder and a reed inwards turned from the top end of the first cylinder, and the reed has elastic deformation along the axial direction and the radial inward direction under the pressing of external force; the outer conductor and the insulating medium are integrated by injection molding, and the insulating medium at least partially wraps the outer conductor from the outer side to support the outer conductor from the axial direction and/or the radial direction; the two ends of the inner conductor are respectively connected with the two circuit boards to form a first transmission channel of the electric signals, and the outer conductor is connected with at least one of the two circuit boards to form a second transmission channel of the electric signals.

Description

Inter-board radio frequency connector and signal transmission device

Technical Field

The invention relates to the technical field of communication, in particular to an inter-board radio frequency connector and a signal transmission device.

Background

The traditional board-to-board interconnection radio frequency connector is a 50 ohm coaxial device generally composed of an inner conductor, a dielectric material, a shell (according to varieties), accessories and the like, each part is formed by mechanical addition, and at least more than 2 radio frequency connectors are needed for realizing interconnection between an upper circuit board and a lower circuit. The single rf connector is only a port, has no elastic deformation, and can only be used for hard connection.

Disclosure of Invention

The embodiment of the application provides an inter-board radio frequency connector and a signal transmission device, realize great radial and axial deformation that floats through inner conductor and the outer conductor that has elastic deformation volume, socket or plug connector have been saved respectively on the circuit board, install the inter-board radio frequency connector of a piece formula in the metal cavity, can make reasonable use of inter-board space, the accumulative tolerance of absorption board between to the board, when realizing that radio frequency signal stably transmits, reduce the inter-board distance by a wide margin, welding and the installation procedure on the board have been simplified, make things convenient for the maintenance and the change of monomer device, make the productivity effect improve by a wide margin.

The embodiment of the application provides an inter-board radio frequency connector which is used for being electrically connected between two circuit boards and comprises an inner conductor, an outer conductor and an insulating medium positioned between the inner conductor and the outer conductor,

the inner conductor is a metal elastic needle which has elastic deformation along the axial direction under external force pressing, and the axial direction of the inner conductor is perpendicular to the two circuit boards;

the outer conductor comprises a first cylinder and a reed inwards turned from the top end of the first cylinder, and the reed has elastic deformation along the axial direction and the radial inward direction under the pressing of external force;

the outer conductor and the insulating medium are integrally molded in an injection mode, and the insulating medium at least partially wraps the outer conductor from the outside to support the outer conductor from the axial direction and/or the radial direction;

the two ends of the inner conductor are respectively connected with the two circuit boards to form a first transmission channel of an electric signal, and the outer conductor is connected with at least one of the two circuit boards to form a second transmission channel of the electric signal.

In one embodiment, the outer conductor comprises:

a first cylinder;

a plurality of spring leaves protruding upward from a top edge of the first cylinder;

the insulating medium comprises a first cylinder located in the first cylinder and a second cylinder surrounding the top edge of the first cylinder from the outside, and the second cylinder supports the reed from the bottom.

In one embodiment, each of said reeds comprises:

an eversion folded radially outward from a top edge of the first barrel;

an inverted portion folded radially inward from an edge of the everted portion;

the bulge part protrudes upwards from the edge of the inward-turning part and forms a radial inward included angle with the inward-turning part, and the edge of the bulge part is provided with a bend so as to form a first elastic contact connected with one of the two circuit boards;

the top of the secondary post supports the eversion.

In one embodiment, the top of the first cylinder further comprises an enlarged diameter extension, the eversion being sandwiched between the extension and the second cylinder,

the height of the extension part is the same as that of the second cylinder.

In one embodiment, each of said leaves further comprises a leaf slot open along its length.

In one embodiment, the first cylinder is provided with a plurality of through holes arranged at intervals along the circumferential direction, and the first cylinder and the second cylinder are connected into a whole through the through holes.

In one embodiment, the first cartridge comprises:

the bulges are arranged at intervals along the circumferential direction of the first cylinder to form a second elastic contact which protrudes outwards from the outer surface of the first cylinder.

In one embodiment, the insulating medium is internally provided with a containing hole for containing the inner conductor, the containing hole extends along the axial direction of the inner conductor, and two ends of the inner conductor respectively protrude out of two ends of the insulating medium so as to be respectively electrically connected with the two circuit boards;

both ends of the inner conductor have elastic deformation amounts in both directions in the axial direction with respect to the insulating medium.

In one embodiment, the inner conductor is a one-way floating metal spring pin;

the inner conductor is clearance-fitted to the accommodation hole to have a movement amount in the axial direction with respect to the accommodation hole.

In one embodiment, the inner conductor is a metal spring pin that floats bi-directionally;

the inner conductor is in interference fit with the accommodating hole.

Another embodiment of the present invention also provides a signal transmission apparatus, including:

the two circuit boards are provided with plane contacts corresponding to the positions on each circuit board;

the top and the bottom of the metal cavity are respectively and electrically connected with the two circuit boards, and a cavity extending in a direction perpendicular to the two circuit boards is formed in the metal cavity;

the inter-board rf connector as described above, wherein the inter-board rf connector is disposed in the cavity, and the inter-board rf connector is electrically connected to the planar contacts of the two circuit boards and electrically connected to the metal cavity.

In one embodiment, the outer conductor is electrically connected with the metal cavity to form a second transmission channel of the electric signal between the two circuit boards together with the metal cavity.

Therefore, in the inter-board radio frequency connector of the embodiment, the conduction of the radio frequency signal is realized through the inner conductor and the outer conductor with elastic deformation, wherein the inner conductor has elastic deformation along the axial direction, and the outer conductor has elastic deformation along both the axial direction and the radial inward direction, so that larger floating deformation along the radial direction and the axial direction is realized together, and the accumulated deviation of a dimension chain under the interconnection of the boards and the boards is absorbed.

Further, the outer conductor and the insulating medium 3 in the board-to-board rf connector of the present embodiment are molded as a single body, the insulating medium 3 may provide support for the outer conductor from the inside, and the insulating medium 3 further includes a portion wrapping the outer side of the outer conductor 2, and may further provide support for the outer conductor 2, particularly the spring 211 at the top thereof, at the outer side thereof, so as to prevent the spring 211 capable of elastic deformation from breaking.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of an inter-board rf connector according to the present invention.

Fig. 2 is a cross-sectional view of the outer conductor and the insulating medium in the board-to-board rf connector of the present invention.

Fig. 3 is a schematic structural diagram of an outer conductor in the inter-board rf connector according to the present invention.

Fig. 4 is a schematic structural diagram of an insulating medium in the inter-board rf connector according to the present invention.

Fig. 5 is a cross-sectional view of a first embodiment of the board-to-board rf connector of the present invention.

Fig. 6a and 6b are cross-sectional views of the insulating medium and inner conductor of fig. 5.

Fig. 7a and 7b are a cross-sectional view of a first embodiment of an inter-board rf connector of the present invention and a cross-sectional view of the inner conductor.

Fig. 8 and 9 are sectional views of the signal transmission device of the present invention.

Detailed Description

For better understanding of the above technical solutions, the following will describe in detail exemplary embodiments of the present application with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present application, and not all embodiments of the present application, and it should be understood that the present application is not limited by the exemplary embodiments described herein.

The embodiment of the application provides an inter-board radio frequency connector, realizes great radial and axial floating deformation through inner conductor and the outer conductor that has the elastic deformation volume for the size chain accumulated deviation under the board to the board interconnection has stable contact resistance and elasticity recoverability, better standing wave and insertion loss characteristic, can realize radio frequency signal's stable transmission.

Fig. 1 is a schematic structural diagram of an inter-board rf connector according to the present invention. Fig. 2 is a cross-sectional view of the outer conductor and insulating medium in the board-to-board rf connector of the present invention. Fig. 3 is a schematic structural diagram of an outer conductor in the inter-board rf connector according to the present invention. As shown in fig. 1 to 3, an embodiment of the present invention provides an inter-board rf connector for electrically connecting between two circuit boards, including: an inner conductor 1, an outer conductor 2, and an insulating medium 3 located between the inner conductor 1 and the outer conductor 2.

The inner conductor 1 is a metal elastic needle which has elastic deformation along the axial direction under external force pressing, and the axial direction of the inner conductor 1 is vertical to the two circuit boards;

the outer conductor 2 includes a first cylinder 21 and a spring piece 211 turned inside from the tip of the first cylinder 21, the spring piece 211 having an elastic deformation amount in the axial direction and the radially inward direction under an external force pressing;

the outer conductor 2 and the insulating medium 3 are molded into a whole, and the insulating medium 3 at least partially wraps the outer conductor 2 from the outside to support the outer conductor 2 from the axial direction and/or the radial direction;

the inner conductor 1 is connected at both ends thereof to the two circuit boards 100,100 'respectively to form a first transmission path of an electrical signal, and the outer conductor 2 is connected to at least one of the two circuit boards 100,100' to form a second transmission path of an electrical signal.

As shown in fig. 1, the spring 211 at the top end of the outer conductor 2 and the top end of the inner conductor 1 are exposed at the top end of the insulating medium 3 to form an electrical connection with an upper circuit board (a circuit board on top of the rf connector). The bottom of the inner conductor 1 is exposed to the bottom end of the insulating medium 3 to form an electrical connection with a lower circuit board (a circuit board located at the bottom of the radio frequency connector).

The inner conductor 1 may be implemented as a pogo pin or other elastic contact, and under the action of an external force, specifically, a pressing action, the top end and/or the bottom end of the inner conductor 1 can be compressed along the axial direction, and an electrical connection with a corresponding circuit board is achieved.

Further, the tip of the outer conductor 2, in particular the tip of the first cylinder 21, is formed with a spring 211 that is turned inside out, and the spring 211 may have a compression in the axial direction and a compression in the radially inward direction under the action of an external force, in particular a pressing action.

The inter-board radio frequency connector of the embodiment can be adapted to a circuit board with a certain thickness, and can be used as a surface-mounted device or be in plug-in welding with the circuit board. The inter-board radio frequency connector in the embodiment is a one-piece connector, realizes radio frequency signal transmission between a small board and a medium board through small matching height, and can be smaller than 4.5mm in size so as to greatly reduce the volume of the whole machine. The inter-board radio frequency connector of the embodiment realizes elastic contact, and can realize multi-channel plug-and-pull-free operation, thereby greatly reducing the cost of devices.

As shown in fig. 2 and 3, the outer conductor 2 includes:

a first cylinder 21;

a plurality of spring leaves 211, the plurality of spring leaves 211 protruding upwards from the top edge of the first cylinder 21 and being folded inwards;

the insulating medium 3 comprises a first cylinder 31 located inside the first cylinder 21 and a second cylinder 32 surrounding the top edge of the first cylinder 21 from the outside, the second cylinder 32 supporting the spring 211 from the bottom.

Here, since the outer conductor 2 and the insulating medium 3 are injection molded, the first column 31 and the second column 32 of the insulating medium 3 are connected into a whole to achieve the purpose of embedding the outer conductor 2, especially the spring 211, into the insulating medium 3.

In one embodiment, the top edge of the first cylinder 21 has a plurality of through holes 2121 spaced along the circumferential direction, and during the injection molding process, the insulating medium 3 inside the first cylinder 21 is extruded out of the first cylinder 21 from the through holes 2121 to form a second cylinder 32 (specifically, a cylindrical shape) surrounding the first cylinder 21.

The top of the second post 32 abuts the bottom edge of the spring 211 to form a support and fixation for the spring 211. The spring 211 is elastically deformed with the bottom contacting the top edge of the first cylinder 21 as a fulcrum.

Specifically, as shown in FIG. 2, in one particular embodiment, each reed 211 comprises:

an out-turned portion 2111, the out-turned portion 2111 being turned radially outward from the top edge of the first barrel 21;

an inverted portion 2112, the inverted portion 2112 being turned radially inward from the edge of the outward turned portion 2111;

a boss 2113, the boss 2113 protruding upward from an edge of the in-turned portion 2112 and forming an angle radially inward with the in-turned portion 2112, the edge of the boss 2113 having a bend 2114 to form a first elastic contact;

the top of the second post 32 supports the valgus 2111.

In this example, the leaves 211 are folded inwardly by the in-turned portions 2112, and the raised portions 2113 have a radially inward offset in addition to being compressed downwardly under the pressing action.

In this embodiment, the spring plate 211 is made of titanium copper or beryllium copper with a certain elasticity and high compression strength, and can be formed into a structural member with a specific shape by a stamping and wrapping process. The thickness is usually 0.1-0.2 mm.

In one particular embodiment, as shown in fig. 2, the top of the first cylinder 31 further includes an enlarged diameter extension 311, the eversion 2111 is sandwiched between the extension 311 and the second cylinder 32,

the heights of the extension 311 and the second pillar 32 are the same.

The outer extension 311, which has a diameter larger than that of the first cylinder 21, extends outward from the inside-out 2111 so as to sandwich the inside-out 2111 between the outer extension 311 and the second cylinder 32 to achieve support and fixation of the inside-out 2111 in the axial direction.

Wherein the top of the extension 311 does not contact the in-turned portion 2112 to avoid interference therewith during deformation of the reed 211. This may be accomplished, for example, by making the diameter of the outer extent 311 smaller than the inner diameter of the varus portion 2112, or, for example, by making the height of the top of the outer extent 311 lower than the height of the varus portion 2112.

Alternatively, the top of the extension 311 can also serve as a limit to the range of deformation of the reed 211. For example, the height of the top of the extension 311 may form a definition of the lowest point of the elastic deformation stroke for the protrusion 2113.

The height of the outward extension 311 and the second post 32 is the same, i.e., the eversion 2111 may be located at the midpoint of the outward extension 311 and the second post 32 to achieve the most stable support for the eversion 2111.

As shown in FIGS. 2 and 3, each spring 211 further includes a spring slot 2115 along its length, the spring slot 2115 being adapted to relieve stress from the spring 211.

In one embodiment, as shown in fig. 3, the first cylinder 21 further includes:

and a plurality of protrusions 222, the protrusions 222 being spaced along the circumference of the first cylinder 21 to form second elastic contacts protruding outward from the outer surface of the first cylinder 21.

In this embodiment the outer conductor 2 provides a two-position resilient contact for a more stable electrical contact between the plates. The second elastic contact is used for realizing the electrical connection between the outer conductor 2 and the outer conductor wrapping the inter-board radio frequency connector, so that a second transmission channel of the electrical signal is formed through the cylindrical outer wall of the outer conductor 2.

The first cylinder 21 may be a one-piece cylindrical shape, or as shown in fig. 3, the first cylinder 21 is formed by combining a plurality of cylinder wall elements. Wherein the plurality of cartridge wall elements may be connected, for example, by means of a snap 223 providing a stop in the circumferential direction. The snap 223 is disposed along the cylindrical surface of the barrel forming an arc conforming to the cylindrical surface.

In a preferred embodiment, as shown in fig. 2, the insulating medium 3 has a receiving hole therein for receiving the inner conductor 1, the receiving hole extends along the axial direction of the inner conductor 1, and two ends of the inner conductor 1 respectively protrude from two ends of the insulating medium 3 to be electrically connected to two circuit boards respectively.

Both ends of the inner conductor 1 have elastic deformation amounts in both directions along the axial direction with respect to the insulating medium 3.

The bidirectional elastic deformation of the inner conductor 1 can be achieved in different ways.

In the first embodiment as shown in fig. 5, the inner conductor 1 is a one-way floating metal spring pin; the inner conductor 1 is clearance-fitted to the receiving hole to have a movement amount in the axial direction with respect to the receiving hole.

In the embodiment shown in fig. 6b, the inner conductor 1 comprises:

a sleeve 11 having a cavity extending in an axial direction;

the bottom end of the moving bullet 121 is movably arranged in the cavity through the spring 13 so as to have a unidirectional moving degree of freedom along the axial direction, the top end of the moving bullet 121 protrudes out of the top end of the sleeve 11, and the moving stroke of the moving bullet 121 is higher than that of the sleeve 11;

meanwhile, the bottom end of the sleeve 11 further has a fixing bullet 122 formed at the bottom end of the sleeve 11, fixed in position relative to the sleeve 11.

The outer edge of the sleeve 11 further includes a fitting portion 111 protruding from the sleeve 11, the receiving hole further includes a limiting step 112 for receiving the fitting portion 111, and the length of the limiting step 112 in the axial direction of the inner conductor 1 is greater than that of the fitting portion 111.

The sleeve 11 is installed in the insulating medium 3, and may be in clearance fit with the accommodating hole of the insulating medium 3, so that the sleeve 11 may move in the insulating medium 3 along the axial direction of the inner conductor 1, and the floating range of the sleeve is limited by the limit of the fitting portion 111 and the limit step 112.

The elastic deformation amount of both ends of the inner conductor 1 in both directions in the axial direction with respect to the insulating medium 3 is achieved in this embodiment by the combination of the entire movement of the sleeve 11 and the unidirectional floating of the moving bullet 121.

In the embodiment shown in fig. 7a and 7b, the inner conductor 1 is a metal spring pin that floats in both directions; the inner conductor 1 is interference-fitted to the receiving hole. The inner conductor 1 includes:

a sleeve 11 having a cavity extending in an axial direction;

the movable warhead 121 is movably disposed in the cavity through the spring 13 at the bottom end of the movable warhead 121 to have a unidirectional moving degree of freedom along the axial direction, wherein the inner conductor 1 includes two movable warheads 121 respectively disposed at two ends of the sleeve 11.

As shown in fig. 8 and 9, another embodiment of the present invention also provides a signal transmission apparatus including:

two circuit boards 100,100', each circuit board 100,100' having a planar contact at a corresponding location;

a metal cavity 200, wherein the top and the bottom of the metal cavity 200 are electrically connected with the two circuit boards 100 and 100', respectively, and a cavity extending along a direction perpendicular to the two circuit boards 100 and 100' is formed in the metal cavity 200;

as mentioned above, the inter-board rf connector is disposed in the cavity and is electrically connected to the planar contacts of the two circuit boards 100,100' and to the metal cavity 200.

Wherein the inter-board rf connector is in interference fit with the metal cavity 200 to achieve good electrical contact with the metal cavity 200. In this embodiment, the two ends of the inner conductor 1 of the board-to-board rf connector are respectively connected to the two circuit boards 100,100' to form a first transmission channel for electrical signals, the outer conductor 2 is connected to one of the circuit boards 100,100' through the spring 211, and is electrically connected to the metal cavity 200 through the cylindrical wall of the outer conductor 2, so as to form a second transmission channel for electrical signals between the two circuit boards 100,100' through the metal cavity 200. Alternatively, the bottom of the metal cavity 200 may be electrically connected to the circuit board 100' through a medium such as a conductive paste.

According to the invention, the traditional radio frequency connector shell is replaced by the reed outer conductor formed by stamping and wrapping processes, the traditional central structural part is replaced by the central probe, the insulator between the reed and the probe is made of an injection-moldable dielectric material, and the reed and the insulator are mutually embedded by injection molding, so that the connector has a certain elastic deformation amount, and can replace 2 or 2 hard connection schemes of traditional plate hard connection, the distance between plate and plate is greatly reduced, and the batch cost is reduced.

The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is provided for purposes of illustration and understanding only, and is not intended to limit the application to the details which are set forth in order to provide a thorough understanding of the present application.

The block diagrams of devices, apparatuses, systems referred to in this application are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. As used herein, the words "or" and "refer to, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".

It should also be noted that in the devices, apparatuses, and methods of the present application, the components or steps may be decomposed and/or recombined. These decompositions and/or recombinations are to be considered as equivalents of the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of exemplary aspects and embodiments have been discussed above, those of skill in the art will recognize that certain variations, modifications, alterations, additions and sub-combinations thereof are encompassed within the scope of the invention.

Claims

1. An inter-board radio frequency connector for electrically connecting between two circuit boards (100, 100'), characterized by comprising an inner conductor (1), an outer conductor (2), and an insulating medium (3) between the inner conductor (1) and the outer conductor (2),

wherein the inner conductor (1) is a metal elastic needle having an elastic deformation amount in an axial direction under an external force pressing, and the axial direction of the inner conductor (1) is perpendicular to the two circuit boards (100, 100');

the outer conductor (2) comprises a first cylinder (21) and a spring piece (211) which is turned inwards from the top end of the first cylinder (21), and the spring piece (211) has elastic deformation amounts in the axial direction and the radial inward direction under the pressing of external force;

the outer conductor (2) and the insulating medium (3) are integrally injection-molded, and the insulating medium (3) wraps the outer conductor (2) at least partially from the outside to support the outer conductor (2) from the axial direction and/or the radial direction;

the two ends of the inner conductor (1) are respectively connected with the two circuit boards (100, 100 ') to form a first transmission channel of electric signals, and the outer conductor (2) is connected with at least one of the two circuit boards (100, 100') to form a second transmission channel of electric signals.

2. A board-to-board radio frequency connector according to claim 1, characterized in that said outer conductor (2) comprises:

a first cylinder (21);

a plurality of spring leaves (211), the plurality of spring leaves (211) protruding upward from a top edge of the first cylinder (21);

the insulating medium (3) comprises a first cylinder (31) located inside the first cylinder (21) and a second cylinder (32) surrounding the top edge of the first cylinder (21) from the outside, the second cylinder (32) supporting the spring (211) from the bottom.

3. A board-to-board radio frequency connector according to claim 2, characterized in that each of said reeds (211) comprises:

an eversion (2111), the eversion (2111) being turned radially outward from a top edge of the first barrel (21);

an inverted portion (2112), the inverted portion (2112) being turned radially inward from an edge of the inverted portion (2111);

a boss (2113), the boss (2113) projecting upwardly from an edge of the in-turned portion (2112) and forming a radially inward included angle with the in-turned portion (2112), the edge of the boss (2113) having a bend (2114) to form a first resilient contact connected to one of the two circuit boards (100, 100');

the top of the second post (32) supports the eversion (2111).

4. A board-to-board radio frequency connector according to claim 3, characterized in that the top of the first cylinder (31) further comprises an outer extension (311) of increased diameter, the evagination (2111) being clamped between the outer extension (311) and the second cylinder (32),

the height of the extension part (311) is the same as that of the second cylinder (32).

5. The board-to-board radio frequency connector of claim 2, wherein each of said reeds (211) further comprises a reed slot (2115) along a length thereof.

6. The board-to-board radio frequency connector according to claim 2, wherein the first cylinder (21) has a plurality of through holes (2121) arranged at intervals along a circumferential direction, and the first cylinder (31) and the second cylinder (32) are connected into a whole through the through holes (2121).

7. A board-to-board radio frequency connector according to claim 2, characterized in that said first cylinder (21) comprises:

the protrusions (222) are arranged at intervals along the circumferential direction of the first cylinder (21) to form second elastic contacts protruding outwards from the outer surface of the first cylinder (21).

8. The inter-board radio frequency connector according to claim 1, wherein the insulating medium (3) has a receiving hole therein for receiving the inner conductor (1), the receiving hole extending in an axial direction of the inner conductor (1), and both ends of the inner conductor (1) respectively protrude from both ends of the insulating medium (3) to be electrically connected to the two circuit boards (100, 100') respectively;

both ends of the inner conductor (1) have elastic deformation amounts in both directions along the axial direction with respect to the insulating medium (3).

9. The board-to-board radio frequency connector according to claim 8, characterized in that the inner conductor (1) is a one-way floating metal spring pin;

the inner conductor (1) is clearance-fitted to the accommodation hole so as to have a movement amount in the axial direction with respect to the accommodation hole.

10. The board-to-board radio frequency connector according to claim 8, characterized in that the inner conductor (1) is a bidirectional floating metal spring pin;

the inner conductor (1) is in interference fit with the accommodating hole.

11. A signal transmission apparatus, comprising:

two circuit boards (100, 100 '), each circuit board (100, 100') having a planar contact at a corresponding location;

a metal cavity (200), wherein the top and the bottom of the metal cavity (200) are respectively electrically connected with the two circuit boards (100, 100 '), and a cavity extending along a direction perpendicular to the two circuit boards (100, 100') is formed in the metal cavity (200);

the board-to-board rf connector of any one of claims 1 to 10, disposed within the cavity, electrically connected to planar contacts of the two circuit boards (100, 100') and to the metal cavity (200).

12. The signal transmission device according to claim 11, characterized in that the outer conductor (2) is electrically connected with the metal cavity (200) to form a second transmission channel of electrical signals between the two circuit boards (100, 100') together with the metal cavity (200).