AU2020100572A4

AU2020100572A4 - Board-to-board radio-frequency connector

Info

Publication number: AU2020100572A4
Application number: AU2020100572A
Authority: AU
Inventors: Jianxin He; Zhiqiang Song; Yao Wang
Original assignee: Kingsignal Technology Co Ltd
Current assignee: Kingsignal Technology Co Ltd
Priority date: 2018-08-31
Filing date: 2020-04-15
Publication date: 2020-05-28
Anticipated expiration: 2027-08-08
Also published as: WO2020042886A1; CN109103628A; AU2019330671A1

Abstract

A board-to-board radio frequency connector (10) includes a movable component (1) and an adapter component (2). The movable component (1) includes a first contact pin (11) and a first outer conductor (12). An outer diameter of the first contact pin (11) ranges from 0.65 mm to 0.75 mm. The first outer conductor (12) is provided with a first receiving cavity (16). A diameter of the first receiving cavity (16) ranges from 3.25 mm to 3.45 mm. One end of the first contact pin (11) is fixedly connected to the first outer conductor (12), and the other end of the first contact pin (11) is located in the first receiving cavity (16). A first gap is formed between the first receiving cavity (16) and the first contact pin (11). One end of the adapter component (2) is slidably located in the first receiving cavity (16), and is detachably connected to the other end of the first contact pin (11). The board-to-board radio frequency connector (10) has a simple structure and employs a mode of mutual compensation of high and low impedances to achieve the impedance matching over a certain length in a frequency range, which is suitable for high-density matrix installation. 16 \\26 \27 28/ 32

Description

BOARD-TO-BOARD RADIO-FREQUENCY CONNECTOR

CROSS REFERENCE TO RELATED APPLICATION [0001] The present disclosure claims the priority of Chinese Patent Application No. 201811010209.0, entitled “Board-to-Board Radio Frequency Connector”, filed on August 31, 2018, the entire content of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD [0002] The present disclosure relates to the field of connector technology.

BACKGROUND [0003] A board-to-board radio frequency connector is a device for connecting radio frequency signals between two PCB boards, and is widely used in connection scenarios of PCB modules in a Radio Remote Unit (RRU) communication equipment. It is necessary to meet the requirements of use of the multi-channel floating blind plug when the board-to-board radio frequency connector is applied, such as AFI, EFI and HD-EFI series of Amphenol Company, SMP-MAX series of Radial Company, MBX and MFBX series of Huber Suhner Company, and so on. With the development of communication technology, especially the development of 5G communication, a new type of board-to-board connector is needed, which can also maintain good radio frequency transmission performance at a high frequency band.

SUMMARY [0004] According to various embodiments of the present disclosure, a board-to-board radio frequency connector is provided.

[0005] A board-to-board radio frequency connector includes a movable component and an adapter component. The movable component includes a first contact pin and a first outer conductor. An outer diameter of the first contact pin ranges from 0.65 mm to 0.75 mm. The first outer conductor is provided with a first receiving cavity. A diameter of the first receiving cavity ranges from 3.25 mm to 3.45 mm. One end of the first contact pin is fixedly connected to the first outer conductor, and the other end of the first contact pin is located in the first receiving cavity. A first gap is formed between the first receiving cavity and the first contact pin. One end

2020100572 15 Apr 2020 of the adapter component is slidably located in the first receiving cavity, and is detachably connected to the other end of the first contact pin.

[0006] Details of one or more embodiments of the present disclosure are set forth in the following drawings and description. Other features, objectives and advantages of the present disclosure will become apparent from the specification, accompanying drawings and claims.

BRIEF DESCRIPTION OF THE DRAWINGS [0007] In order to illustrate technical solutions in embodiments of the present disclosure or in the prior art more clearly, accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Apparently, the accompanying drawings in the following description merely show some embodiments of the present disclosure, and those of ordinary skill in the art can obtain accompanying drawings of other embodiments according to these accompanying drawings without any creative effort.

[0008] FIG. 1 is an exploded perspective view of a board-to-board radio frequency connector according to an embodiment;

[0009] FIG. 2 is a cross-sectional view of a board-to-board radio frequency connector according to an embodiment;

[0010] FIG. 3 is an Sil curve graph of a board-to-board radio frequency connector according to an embodiment.

DETAILED DESCRIPTION OF THE EMBODIMENTS [0011] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more comprehensively with reference to the related accompanying drawings. Preferred embodiments of the present disclosure are shown in the accompanying drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of providing these embodiments is to make the understanding of the present disclosure more thoroughly and comprehensively.

[0012] It is well known to those skilled in the art that, in order to axially move within a certain length range and ensure the radio frequency performance changes little, the characteristic impedance matching of the transmission line needs to be guaranteed. In order to achieve continuous impedance, an existing method is to refer to a mode of an IMP radio

2020100572 15 Apr 2020 frequency connector. Specifically, a multi-section air compensation connection is designed inside the connector, such that the characteristic impedance at each air compensation connection is a standard characteristic impedance of 50 ohms. Whether the air compensation connection is elongated or shortened, the impedance changes little. But this mode has limitation to the length and the size of the connector, and also requests a high parts processing technology. Therefore, this mode has a large quality risk, and is not suitable for large-scale supply.

[0013] Another method is to use a three-piece board-to-board mode, such as HDEFI series of Amphenol Radio Frequency Division. In the HDEFI series, for structures of a fixed end and a sliding end, reference can be made to a SMP mode. The outer diameter of the plug-in center pin is 0.1 mm greater than that of the SMR A large number of designs are made on the middle rod. Insulation protection is designed for both the center pin and the outer conductor elastomer. A stamping process can be used for hardware parts which have advantages in terms of structural reliability, processing technology and cost. However, the radio frequency power capacity of the hardware parts is not large, and the applicability is not good. When the bandwidth is in DC-6GHz range and the axial limit tolerance thereof is above +/- 0.7 mm, the standing wave performance is not good, and the return loss is 16 dB (VSWR 1.38) @ 4-6GH @ tolerance +/- 0.7 mm, which is insufficient under the application condition of a high frequency and a large tolerance.

[0014] In order to solve the above problems, referring to FIG. 1, a board-to-board radio frequency connector 10 in an embodiment includes a movable component 1, an adapter component 2 and a fixed component 3. One end of the adapter component 2 is fixedly connected to the fixed component 3, and the other end thereof is slidably connected to the movable component 1.

[0015] Referring to FIG. 2, the movable component 1 includes a first contact pin 11 and a first outer conductor 12. The first outer conductor 12 is provided with a first receiving cavity 16. One end of the first contact pin 11 is fixedly connected to the first outer conductor 12, and the other end of the first contact pin 11 is located in the first receiving cavity 16. The diameter of the first receiving cavity 16 ranges from 3.25 mm to 3.45 mm. The outer diameter of the first contact pin 11 ranges from 0.65 mm to 0.75 mm. In an embodiment, the diameter of the first receiving cavity 16 is 3.35 mm, and the outer diameter of the first contact pin 11 is 0.7 mm. Because the diameter of the first receiving cavity 16 is much greater than the outer diameter of the first contact pin 11, a first gap 13 is formed between the first receiving cavity 16 and the first contact pin 11.

[0016] In the present embodiment, the diameter of the first receiving cavity 16 is set in a

2020100572 15 Apr 2020 range from 3.25 mm to 3.45 mm and the outer diameter of the first contact pin 11 is set in a range from 0.65 mm to 0.75 mm, such that the impedance change of the first gap 13 is smaller.

[0017] In addition, since the outer diameter of the first contact pin 11 is larger, while the diameter of the first receiving cavity 16 is not increased, the installation space can be saved, which is suitable for high-density matrix installation. When the first contact pin 11 slides relative to the adapter component 2, the impedance change of the first gap 13 is smaller. Therefore, the board-to-board radio frequency connector 10 described above is simple in structure, easy to process and manufacture, and has a larger tolerance at a high frequency, and has a more stable Voltage Standing Wave Ratio (VSWR).

[0018] In the present embodiment, one side of the first outer conductor 12 at an end portion of the first receiving cavity 16 is provided with an inclined surface 14 surrounding the first contact pin 11. By providing the inclined surface 14, the whole volume of the first gap 13 can be decreased, the impedance change of the first gap 13 can be reduced when the first contact pin 11 slides relative to the adapter component 2.

[0019] One end of the adapter component 2 is slidably located in the first receiving cavity 16, and is detachably connected to one end of the first contact pin 11 located in the first receiving cavity 16. As shown in FIG. 2, the adapter component 2 includes an adapter insulator 21 and an adapter member 22 fixedly provided in the adapter insulator 21. One end of the adapter member 22 adjacent to the movable component 1 is provided with a first coupling portion 24 matching the first contact pin 11. An outer diameter of the first coupling portion 24 is larger than an outer diameter of the adapter member 22, and the first coupling portion 24 has a sliding slot for receiving the first contact pin 11, so that the first contact pin 11 can slide in the first coupling portion 24. An axial second gap 26 is formed between the first contact pin 11 and the first coupling portion 24. There is a radial third gap 27 between the adapter member 22 and the adapter insulator 21.

[0020] The adapter member 22 can be protected by providing the adapter member 22 in the adapter insulator 21. The outer diameter of the first coupling portion 24 is set to be greater than the outer diameter of the adapter member 22, thereby increasing the impedance of the third gap 27 and improving the matching degree between the impedance of the third gap 27 and the impedance of the first gap 13.

[0021] In the present embodiment, both ends of the adapter component 2 are symmetrically disposed with respect to a center of the adapter component 2, thereby preventing the adapter component 2 from being inserted backward during the installation.

[0022] The fixed component 3 is fixedly connected to one end of the adapter component

2020100572 15 Apr 2020 away from the movable component 1. The fixed component 3 includes a second outer conductor 32 and a second contact pin 31. One end of the adapter member 22 adjacent to the fixed component 3 is provided with a second coupling portion 25 matching the second contact pin 31. The second outer conductor 32 is provided with a second receiving cavity 34. The second coupling portion 25 is located in the second receiving cavity 34. The shape of the second coupling portion 25 is substantially the same as that of the first coupling portion 24, but the second contact pin 31 cannot slide within the second coupling portion 25. An axial fourth gap 28 is formed between the second contact pin 31 and the second coupling portion 25. In the present embodiment, since the space of the fourth gap 28 is limited, the fourth gap 28 presents a low impedance.

[0023] In the present embodiment, the adapter component 2 further includes an outer conductor elastic piece 23 with a plurality of branches. The outer conductor elastic piece 23 sleeves the adapter insulator 21, and both ends of the outer conductor elastic piece 23 respectively abut against a side wall of the first receiving cavity 16 and a side wall of the second receiving cavity 34.

[0024] In the present embodiment, since there is no insulator provided outside the outer conductor elastic piece 23, a front length of the adapter component 2 can be saved, thereby facilitating the design of the electrical performance.

[0025] In the present embodiment, the movable component 1 further includes a first insulating support member 15 provided at one end of the first outer conductor 12. One end of the first contact pin 11 extends through the first insulating support member 15 and is fixedly connected to the first insulating support member 15.

[0026] In the present embodiment, the fixed component 3 further includes a second insulating support member 33 provided at one end of the second outer conductor 32. One end of the second contact pin 31 extends through the second insulating support member 33 and is fixedly connected to the second insulating support member 33.

[0027] The first contact pin 11 and the second contact pin 31 are respectively fixed via the first insulating support member 15 and the second insulating support member 33, thereby improving the connective stability of the connector 10.

[0028] In the present embodiment, it is measured that a characteristic impedance of the first gap 13 ranges from 90 ohms to 95 ohms, characteristic impedances of the second gap 26 and the fourth gap 28 both range from 35 ohms to 40 ohms, and a characteristic impedance of the third gap 27 ranges from 55 ohms to 60 ohms. Specifically, when the diameter of the first receiving cavity 16 is 3.35 mm and the outer diameter of the first contact pin 11 is 0.7 mm, it is

2020100572 15 Apr 2020 measured that the characteristic impedance of the first gap 13 is 93 ohms, the characteristic impedances of the second gap 26 and the fourth gap 28 are both 39 ohms, and the characteristic impedance of the third gap 27 is 57 ohms.

[0029] As for a traditional three-piece board-to-board radio frequency connector, in order to improve the impedance matching, the impedance of each gap usually maintains as constant as possible, for example, 50 ohms. In other words, in the conventional idea, the characteristic impedances of the first gap 13, the second gap 26, the third gap 27, and the fourth gap 28 are designed to be the same. However, in the present disclosure, a reverse thinking is employed, in which a mode of mutual compensation of the high and low impedances in the length direction of the connector is employed to implement the impedance matching over a certain length in a frequency range. FIG. 3 shows an Sil curve of a board-to-board radio frequency connector 10 according to an embodiment. As can be seen from FIG. 3, the board-to-board radio frequency connector 10 in the present embodiment can implement a DC-6 GHz, VSWR1.2 @ axial tolerance ranging from 0 mm to 2 mm, and can maintain a certain spread spectrum space.

[0030] In summary, the board-to-board radio frequency connector 10 described above has a simple structure and adopts a mode of mutual compensation of high and low impedances to achieve the impedance matching over a certain length in a frequency range, which is suitable for high-density matrix installation.

[0031] The technical features of the embodiments described above can be arbitrarily combined. Not all possible combinations of the technical features in the embodiments described above are described in order to make the description concise. However, as long as there is no contradictory in the combinations of these technical features, they all shall be considered as the scope of the present disclosure.

[0032] The embodiments described above are merely several exemplary embodiments of the present disclosure, the description thereof is more specific and detailed. But the embodiments described above are not therefore understood as limiting the scope of the present disclosure. It should be noted that several modifications and improvements can also be made by those of ordinary skill in the art without departing from the spirit of the present disclosure, which all fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure shall be subject to the appended claims.

Claims

What is claimed is:

1. A board-to-board radio frequency connector, comprising:

a movable component, comprising a first contact pin and a first outer conductor, an outer diameter of the first contact pin ranging from 0.65 mm to 0.75 mm, the first outer conductor being provided with a first receiving cavity, a diameter of the first receiving cavity ranging from 3.25 mm to 3.45 mm, one end of the first contact pin being fixedly connected to the first outer conductor, and the other end of the first contact pin being located in the first receiving cavity, a first gap being formed between the first receiving cavity and the first contact pin; and an adapter component, one end of the adapter component being slidably located in the first receiving cavity, and being detachably connected to the other end of the first contact pin.
2. The board-to-board radio frequency connector according to claim 1, wherein the adapter component comprises an adapter insulator and an adapter member fixedly provided in the adapter insulator, one end of the adapter member adjacent to the movable component is provided with a first coupling portion matching the first contact pin, an second gap is formed between the first contact pin and the first coupling portion, an third gap is formed between the adapter member and the adapter insulator, an outer diameter of the first coupling portion is greater than an outer diameter of the adapter member.
3. The board-to-board radio frequency connector according to claim 2, further comprising a fixed component, the fixed component being fixedly connected to one end of the adapter component away from the movable component, the fixed component comprising a second contact pin, one end of the adapter member adjacent to the fixed component being provided with a second coupling portion matching the second contact pin, a fourth gap being formed between the second contact pin and the second coupling portion.
4. The board-to-board radio frequency connector according to claim 3, wherein the fixed component comprises a second outer conductor, the second outer conductor is provided with a second receiving cavity, the second coupling portion is located in the second receiving cavity.
5. The board-to-board radio frequency connector according to claim 4, wherein the adapter

2020100572 15 Apr 2020 component further comprises an outer conductor elastic piece, the outer conductor elastic piece sleeves the adapter insulator, and both ends of the outer conductor elastic piece respectively abut against a side wall of the first receiving cavity and a side wall of the second receiving cavity.
6. The board-to-board radio frequency connector according to claim 1, wherein the movable component further comprises a first insulating support member provided at one end of the first outer conductor, one end of the first contact pin extends through the first insulating support member and is fixedly connected to the first insulating support member.
7. The board-to-board radio frequency connector according to claim 4, wherein the fixed component further comprises a second insulating support member provided at one end of the second outer conductor, one end of the second contact pin extends through the second insulating support member and is fixedly connected to the second insulating support member.
8. The board-to-board radio frequency connector according to claim 1, wherein both ends of the adapter component are symmetrically provided with respect to a center of the adapter component.
9. The board-to-board radio frequency connector according to claim 1, wherein one side of the first outer conductor at an end portion of the first receiving cavity is provided with an inclined surface surrounding the first contact pin.
10. The board-to-board radio frequency connector according to claim 1, wherein the diameter of the first receiving cavity is 3.35 mm, and the outer diameter of the first contact pin is 0.7 mm.
11. The board-to-board radio frequency connector according to claim 4, wherein a characteristic impedance of the first gap ranges from 90 ohms to 95 ohms, characteristic impedances of the second gap and the fourth gap both range from 35 ohms to 40 ohms, and a characteristic impedance of the third gap ranges from 55 ohms to 60 ohms.