CN115036724A

CN115036724A - Connector suitable for onboard metal cavity filter

Info

Publication number: CN115036724A
Application number: CN202210741912.9A
Authority: CN
Inventors: 李青伟; 崔岿; 朱红
Original assignee: Sichuan Hengwan Technology Co Ltd
Current assignee: Sichuan Hengwan Technology Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-09-09

Abstract

The invention provides a connector suitable for an onboard metal cavity filter, and relates to the technical field of communication. The invention comprises a guide pin, a metal socket and an insulating needle sleeve for isolating the guide pin, wherein the metal socket is arranged on a PCB (printed circuit board); the guide pin is inserted into the metal socket and extends into the metal cavity filter; the metal cavity filter is used as an outer conductor of the connector, a circular mounting hole is formed in the metal cavity filter, and the insulating needle sleeve is mounted in the mounting hole. The invention is used for connecting the interface between the metal cavity filter and the PCB, and then the transmission of radio frequency signals is carried out through the matching of the guide pin, the socket and the outer conductor (the metal cavity filter). Not only solved current metal cavity filter and PCB board and caused filter lid and resonance bar easily to produce the problem of skew because of the welding, still solved the inconvenient difficult problem of assembly that the 5G basic station internal assembly space is narrow and small and lead to, reduced manufacturing cost.

Description

Connector suitable for onboard metal cavity filter

Technical Field

The invention relates to the technical field of communication, in particular to a connector suitable for an onboard metal cavity filter.

Background

The wireless communication base station refers to a radio transceiver station for information transmission between a wireless terminal and a wireless communication switching center in a certain radio coverage area. The receiving mode of the base station is that an antenna receives signals, the signals are transmitted to a PCB through a filter, and specifically, the signals are transmitted to a core network through a low-noise discharge circuit, a digital intermediate frequency module and an optical module in sequence and then through optical fibers. The transmission mode of the base station is that data of a core network is transmitted to a PCB board through optical fibers, and specifically, the data is transmitted to an antenna end through an optical module, a digital intermediate frequency module and a power amplifier circuit in sequence and then is transmitted to the antenna end through a filter for transmission.

The filter used for the mobile communication base station can effectively restrain useless signals and plays the roles of selecting signals, attenuating noise, filtering interference and the like. Dozens of filters are needed for a 5G wireless communication base station, and with the promotion of green energy and the increasing demand for cost reduction, the demand for low-cost filters is increasing. Meanwhile, with the development of miniaturization and lightness of the mobile base station, the filter in the mobile base station is required to be capable of adapting to the narrow assembling space in the 5G base part, and the requirements of smaller structure and better performance are met. However, an onboard metal cavity filter is generally adopted in the existing base station system, that is, the metal cavity filter is welded on a PCB, and for the commonly used metal cavity filter, the following disadvantages mainly exist:

1) the filter is directly welded on the PCB by adopting a surface-mount process, and the high furnace temperature in the welding process can cause the melting or micro-melting of the soldering tin of the filter cover and the resonance rod, so that the deviation is generated and the performance of the metal cavity filter is influenced;

2) because the onboard metal cavity filter has great limitation on the size of the filter, the smaller the size is, the better the filter is, and the size of the smallest SMP, MCX and other connectors in the current market is still large, so that the use requirement of the filter is difficult to meet.

In view of the above, the inventors of the present invention have made extensive studies and then have proposed a connector suitable for a board-mounted metal cavity filter.

Disclosure of Invention

The invention aims to provide a connector suitable for an onboard metal cavity filter, which is used for connecting an interface between the metal cavity filter and a PCB (printed circuit board), and transmitting a radio frequency signal through a guide pin, so that the problem that a filter cover and a resonance rod are easy to deflect due to high temperature caused by welding of the conventional metal cavity filter and the PCB is solved, the problem of inconvenient assembly due to narrow assembly space in a 5G base station is solved, and the production cost is reduced.

The embodiment of the invention is realized by the following steps:

the embodiment provides a connector suitable for an onboard metal cavity filter, which comprises a guide pin, a metal socket and an insulating needle sleeve for isolating the guide pin, wherein the metal socket is arranged on a PCB (printed circuit board); the guide pin is inserted into the metal socket and extends into the metal cavity filter; the metal cavity filter is provided with a mounting hole, and the insulating needle sleeve is mounted in the mounting hole and sleeved outside the guide needle.

In some embodiments of the present invention, the metal socket includes a hollow metal housing and a clamping member disposed in the metal housing, the metal housing is welded to the PCB, and the clamping member abuts against the guide pin.

In some embodiments of the present invention, the locking member is formed by a plurality of metal elastic pieces, and the plurality of metal elastic pieces are uniformly distributed around the inner wall of the metal housing.

In some embodiments of the present invention, the clip member is a crown spring, and the crown spring is sleeved in the metal housing.

In some embodiments of the present invention, a limiting boss for limiting the movement of the guide pin into the metal cavity filter is disposed on a side wall of the guide pin, and a limiting groove adapted to the limiting boss is disposed in the insulative needle sheath.

In some embodiments of the present invention, the mounting hole has an internal thread, and the outer sidewall of the insulating sleeve has an external thread matching the internal thread.

In some embodiments of the present invention, the insulating needle sheath is embedded in the mounting hole.

In some embodiments of the present invention, an end of the metal socket away from the PCB board extends into the mounting hole and forms a gap with the mounting hole.

In some embodiments of the present invention, the insulative needle sheath is made of a plastic material.

In some embodiments of the present invention, the metal socket is made of any one of silver, copper, and iron.

Compared with the prior art, the embodiment of the invention at least has the following advantages or beneficial effects:

1) the interface between metal cavity filter and the PCB board is connected through this connector, and the transmission of radio frequency signal is carried out to rethread guide pin, has solved current metal cavity filter and PCB board and has caused the problem that filter lid and resonance bar easily produced the skew because of the welding high temperature, can not exert an influence to the performance of filter at all.

2) The cavity of the metal cavity filter is used as the outer conductor of the connector during assembly, and the connector is purchased only, so that the size of the existing product is greatly reduced, and the production cost is reduced to a great extent.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope. It is obvious to a person skilled in the art that other relevant figures can also be derived from these figures without inventive effort.

FIG. 1 is a schematic diagram of a connector suitable for a board-mounted metal cavity filter according to the present invention;

FIG. 2 is a schematic diagram of a backside structure of a metal cavity filter according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a crown spring according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an overall structure of a guide pin according to an embodiment of the present invention;

fig. 5 is a schematic view of a connection structure between a PCB board and a metal cavity filter according to an embodiment of the present invention.

Icon: 100. a filter; 101. mounting holes; 102. a notch; 110. guiding a needle; 111. a limiting boss; 120. an insulating needle sheath; 130. a metal socket; 131. a metal housing; 132. a crown spring; 140. and (7) a PCB board.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "inside", "outside", etc. are used for indicating the orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention usually place when using, the present invention is only used for convenience of description and simplification of the description, but does not indicate or imply that the devices or elements indicated must have specific orientations, be constructed in specific orientations, and operate, and thus, the present invention should not be construed as being limited.

In the description of the embodiments of the present invention, "a plurality" represents at least 2.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Example 1

Referring to fig. 1 to 5, the present embodiment provides a connector suitable for a board-mounted metal cavity filter 100 (hereinafter referred to as a filter 100), which includes a guide pin 110, a metal socket 130 and an insulative needle cover 120 for isolating the guide pin 110, wherein the metal socket 130 is disposed on a PCB 140; the guide pin 110 is inserted into the metal socket 130 and extends into the metal cavity filter 100; the metal cavity filter 100 is provided with a mounting hole 101, and the insulation needle sheath 120 is mounted in the mounting hole 101 and sleeved outside the guide needle 110.

In this embodiment, the connector includes a guide pin 110, a metal socket 130 and an insulating sleeve 120, the guide pin 110 is made of copper, and may also be made of iron, and is used for implementing an inner conductor of the rf signal exchange between the PCB 140 and the filter 100; the insulating needle sheath 120 is made of rubber material, and is mainly used for separating the guide needle 110 from the filter 100, so as to avoid the interference of the cavity of the filter 100 on the transmission of radio frequency signals; in addition, and more importantly, the needle shield 120 can also act as a fixation for the guide pin 110, enhancing the stability of the guide pin 110 after it is installed.

The metal socket 130 includes a metal housing 131 and a clamping member, the metal housing 131 and the clamping member are both made of copper metal, the metal housing 131 is in a hollow cylindrical structure, the clamping member adopts a crown spring 132, and after the crown spring 132 is sleeved inside the metal housing 131, the metal housing 131 and the clamping member together form the metal socket 130. The crown spring 132 is one of the most commonly used connector terminals. The crown spring 132 is low in cost when being large in batch and is suitable for being made into a standard part. The crown spring 132 has the advantages of more contact points, stable and reliable contact when the design is reasonable, low contact resistance and the like, and can provide more radial tolerance.

During assembly, a mounting hole 101 can be formed in the side wall of the cavity of the filter 100 in advance, the insulating needle sleeve 120 made of rubber is embedded in the mounting hole 101, and the insulating needle sleeve 120 is firmly clamped in the mounting hole 101 due to certain elasticity of the rubber; the guide pin 110 is inserted into the needle sheath 120, and thus is covered by the needle sheath 120 and isolated. The metal shell 131 of the metal socket 130 is directly attached to the interface of the PCB 140 by SMT, although it is also possible to adopt an inlay connection, where the interface is used for positioning and soldering the metal socket 130 and transmitting radio frequency signals; then the fixed guide pin 110 is inserted into the metal socket 130, so that the crown spring 132 abuts against the guide pin 110; one end of the installed guide pin 110 is inserted into the metal socket 130, and the other end extends into the metal cavity filter 100. And finally, FIP conductive adhesive is coated on the mounting hole 101, the PCB 140 and the filter 100 are adhered together by the FIP conductive adhesive, when the FIP conductive adhesive is cured, a conductive elastomer is formed and adhered on the filter 100, and a certain compression amount is generated by pressure between the contact surfaces, so that the upper contact surface and the lower contact surface are in precise contact to realize the grounding of the cavity of the filter 100, the radio-frequency signal leakage problem and the electromagnetic shielding problem at the interface position are solved, and the mutual crosstalk between the radio-frequency signals is effectively avoided. To facilitate the passage of tracks on the PCB board 140, a notch 102 may be formed in the cavity side wall of the filter 100 at the mounting hole 101.

When the metal cavity filter 100 and the PCB 140 are used, the interface between the metal cavity filter 100 and the PCB 140 is connected through the connector, and then radio frequency signals are transmitted through the guide pins 110, so that the problem that the cover of the filter 100 and the resonance rod are easy to shift due to high welding temperature of the existing metal cavity filter 100 and the PCB 140 is solved, and the performance of the filter 100 cannot be influenced at all. In addition, on the basis of not changing the structure of the existing filter 100, the size of the existing product is greatly reduced by using the cavity of the existing filter 100 as the outer conductor of the connector.

In some other embodiments, the insulating sleeve 120 may be made of elastic material such as silicone, latex, etc. or plastic.

In some other embodiments, the metal socket 130 may also be made of a conductive metal material such as silver, iron, etc.

Example 2

The present embodiment proposes, based on the technical solution of embodiment 1: the clamping piece is composed of a plurality of metal elastic pieces which are uniformly distributed around the inner wall of the metal shell 131.

In this embodiment, the locking member is formed by five arc-shaped metal elastic pieces with a thickness of 0.1mm, which are not shown in the figure, and can refer to fig. 1, the five metal elastic pieces are uniformly distributed around the inner wall of the metal shell 131 in the circumferential direction, and the outer arc side walls of the five arc-shaped metal elastic pieces are all abutted to the guide pin 110; one end of the arc-shaped metal elastic sheet is welded on the inner wall of the metal shell 131, and the other end of the metal elastic sheet is a free end, so that the metal elastic sheet can be ensured to be elastically deformed after being extruded by the guide pin 110. When the metal spring contacts the guide pin 110, the guide pin 110 contacts the circuit on the PCB 140 through the metal spring, thereby forming a loop and enabling the whole product to work normally. Considering different requirements of resistance, the metal elastic sheet can be plated with nickel, silver, gold and other different surface treatments.

In some other embodiments, a metal spring plate with a thickness of 0.05mm or 0.08mm may also be used, and as for the number of the arc-shaped metal spring plates, the manufacturer may select a corresponding number, such as three, six, or eight, according to practical situations.

Example 3

Referring to fig. 1 and fig. 4, the present embodiment provides the following technical solutions based on embodiment 1: the lateral wall of the guide pin 110 is provided with a limit boss 111 for limiting the guide pin 110 to move towards the metal cavity filter 100, and the insulating needle sheath 120 is provided with a limit groove adapted to the limit boss 111.

In the present embodiment, since the guide pin 110 is inserted into the insulating cap 120 fixed in the mounting hole 101 from the outside of the filter 100, and then the metal socket 130 is assembled with the guide pin 110, there is a risk that the guide pin 110 may move into the metal cavity filter 100 during the process of inserting the guide pin 110 into the metal socket 130, so that the guide pin 110 may not be connected with the metal socket 130. To avoid this, the middle of the needle guide 110 is provided with a conical limiting boss 111, and the insulating needle sheath 120 is provided with a conical limiting groove. After the guide pin 110 is inserted into the insulating needle sheath 120, the conical limiting boss 111 is clamped in the conical limiting groove, so that the situation that the guide pin 110 moves into the metal cavity filter 100 when the metal socket 130 is assembled subsequently is avoided; in addition, generally, a plurality of connection points with the PCB 140 are mounted on the filter 100, and the connection length of the guide pins 110 and the metal sockets 130 arranged on the connection points can be ensured to be consistent after the guide pins 110 are limited, which is undoubtedly helpful for the signal transmission of the filter 100.

Example 4

The present embodiment proposes, based on the technical solution of embodiment 1: an internal thread is arranged in the mounting hole 101, and an external thread matched with the internal thread is arranged on the outer side wall of the insulating needle sleeve 120.

In this embodiment, the insulating needle cover 120 is made of ABS rigid plastic, an external thread is arranged on the outer side wall of the insulating needle cover 120, an internal thread is arranged in the mounting hole 101 of the filter 100, and the insulating needle cover 120 is installed in the mounting hole 101 through a thread, so that the guide needle 110 can be installed on the insulating needle cover 120 first, and then the insulating needle cover 120 is installed on the filter 100 through a thread, which is more convenient to assemble and convenient for later maintenance.

In some other embodiments, the insulating sleeve 120 can be made of PVC, PA, PC, etc. plastic, which is low cost.

Example 5

Referring to fig. 5, the present embodiment proposes, based on the technical solutions of embodiment 1 or embodiment 4: one end of the metal socket 130, which is far away from the PCB 140, extends into the mounting hole 101 and forms a gap with the mounting hole 101.

In this embodiment, during assembly, the insulation needle sheath 120 is installed in the installation hole 101 formed in the sidewall of the cavity of the filter 100 in advance, and the guide pin 110 is inserted into the insulation needle sheath 120, so that the insulation needle sheath 120 covers and separates the installation hole 101 into a blind hole. Extending the metal socket 130 at the interface of the PCB 140 into the mounting hole 101 and plugging with the guide pin 110; when the FIP conductive paste adheres the PCB 140 and the filter 100 together, the metal socket 130 is hidden in the mounting hole 101, a gap is formed between the metal socket 130 and the mounting hole 101, and the metal socket 130 is surrounded by air and uses the air as an insulating medium. Since air has an extremely small dielectric constant, it can be known from the equation Z _0 of impedance 60/√ epsilon ln D/D, and since Z0 is 50 a fixed value, depending on the size of the filter 100, when the diameter D of the outer conductor (i.e., the cavity of the metal filter 100) is fixed, the smaller the dielectric constant epsilon, the larger the diameter of the inner conductor (the guide pin 110), which can improve the reliability and radial tolerance of the connection of the metal jack 130 and the guide pin 110.

In summary, the embodiment of the present invention provides a connector suitable for an on-board metal cavity filter 100, which includes a guide pin 110, a metal socket 130 and an insulating needle sheath 120 for isolating the guide pin 110, wherein the metal socket 130 is disposed on a PCB 140; the guide pin 110 is inserted into the metal socket 130 and extends into the metal cavity filter 100; the metal cavity filter 100 is provided with a mounting hole 101, and the insulation needle sheath 120 is mounted in the mounting hole 101 and sleeved outside the guide needle 110.

When the connector is used, the interface between the metal cavity filter 100 and the PCB 140 is connected through the connector, and then radio frequency signals are transmitted through the guide pins 110, so that the problem that the cover of the filter 100 and the resonance rod are easy to shift due to high welding temperature of the existing metal cavity filter 100 and the PCB 140 is solved, and the performance of the filter 100 cannot be influenced at all. In addition, on the basis of not changing the structure of the existing filter 100, the cavity of the existing filter 100 is used as an outer conductor of the connector, and air is used as an insulating medium, so that the size of the existing product is greatly reduced.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a connector suitable for board carries metal cavity filter which characterized in that: the PCB comprises a guide pin, a metal socket and an insulating needle sleeve for isolating the guide pin, wherein the metal socket is arranged on the PCB; the guide pin is inserted into the metal socket and extends into the metal cavity filter; the metal cavity filter is provided with a mounting hole, and the insulating needle sleeve is mounted in the mounting hole and sleeved outside the guide needle.

2. A connector adapted for use with an on-board metal cavity filter according to claim 1, wherein: the metal socket comprises a hollow metal shell and a clamping piece arranged in the metal shell, the metal shell is welded with the PCB, and the clamping piece is abutted to the guide pin.

3. A connector adapted for use with an on-board metal cavity filter according to claim 2, wherein: the clamping piece is composed of a plurality of metal elastic pieces, and the metal elastic pieces surround the inner wall of the metal shell and are evenly distributed.

4. A connector adapted for use with an on-board metal cavity filter according to claim 2, wherein: the clamping piece is a crown spring, and the crown spring is sleeved in the metal shell.

5. A connector adapted for use with an on-board metal cavity filter according to claim 1, wherein: the lateral wall of guide pin is equipped with the restriction the guide pin to metal cavity filter removes spacing boss, be equipped with in the insulating needle cover with spacing recess of spacing boss looks adaptation.

6. A connector adapted for use with an on-board metal cavity filter according to claim 1, wherein: be equipped with the internal thread in the mounting hole, the insulating needle cover lateral wall be equipped with internal thread matched with external screw thread.

7. A connector adapted for use with an on-board metal cavity filter according to claim 1, wherein: the insulating needle sleeve is embedded in the mounting hole.

8. A connector adapted for a board-mounted metal cavity filter according to claim 6 or 7, wherein: one end of the metal socket, which is far away from the PCB, extends into the mounting hole, and a gap is formed between the metal socket and the mounting hole.

9. A connector adapted for use with an on-board metal cavity filter according to claim 7, wherein: the insulating needle sleeve is made of plastic materials.

10. A connector adapted for a board-mounted metal cavity filter according to claim 1, wherein: the metal socket is made of any one of silver, copper and iron.