CN210016062U

CN210016062U - Fakra radio frequency connector with information isolation structure

Info

Publication number: CN210016062U
Application number: CN201822250527.6U
Authority: CN
Inventors: 朱新爱; 季向荣
Original assignee: Shanghai Laimu Electronic Co Ltd
Current assignee: Shanghai Laimu Electronic Co Ltd
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2020-02-04
Anticipated expiration: 2028-12-29

Abstract

The utility model relates to a Fakra radio frequency connector with information isolation structure, including connector shell (1) and joint (4) and PCB board, shell (1) in by skin to inlayer in proper order the cover be equipped with outer conductor (6), signal isolation layer (2) and inner conductor (3), outer conductor (6) be connected with joint (4) on the PCB board of welded fastening, signal isolation layer (2) be the insulator material, signal isolation layer (2) and inner conductor (3) between be equipped with inclosed cavity layer (5), cavity layer (5) in fill and have the air. Compared with the prior art, the utility model discloses promote transmission quality, reduced the signal loss.

Description

Fakra radio frequency connector with information isolation structure

Technical Field

The utility model relates to a radio frequency coaxial connector especially relates to a Fakra radio frequency connector with fast isolation structure.

Background

In order to connect complex information transmission among systems, Fakra connectors (Fakra radio frequency connectors) are used as radio frequency information series connection of terminal equipment of satellite navigation, mobile communication and the like in an automobile, the Fakra radio frequency connectors are applied to the frequency range of radio frequency signals between 0GHz and 4GHz, and due to the fact that the radio frequency signals have high sensitivity and are easily interfered by noise, the signals are greatly attenuated after the radio frequency signals pass through the Fakra radio frequency connectors due to the fact that the Fakra radio frequency connectors are poor in switching structural design and insufficient in shielding effect. When the Fakra rf connector is applied in a complex vehicle-mounted internal system environment, for example, an environment where an engine and a surrounding communication network interfere with each other, the transmission quality is poor, and finally, the receiving effect of the terminal device is poor, or even the information cannot be effectively identified.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing a Fakra rf connector with an isolation structure.

The purpose of the utility model can be realized through the following technical scheme:

the utility model provides a Fakra radio frequency connector with information isolation structure, includes the shell and the joint and the PCB board of connector, the shell in by skin to inlayer cover in proper order and be equipped with outer conductor, signal isolation layer and inner conductor, outer conductor and welded fastening be the articulate on the PCB board, the signal isolation layer be the insulator material, signal isolation layer and inner conductor between be equipped with inclosed cavity layer, the cavity layer in fill and have the air.

Furthermore, the inner conductor comprises a bending part close to the joint, a thimble joint far away from the joint and a straight section positioned between the bending part and the thimble joint, the bending part is connected with the thimble joint, and the cavity layer is arranged between the straight section and the signal isolation layer.

Furthermore, the signal isolation layer from the one end of keeping away from the joint include first reducing section, seal section and second reducing section in proper order, first reducing section cover locate on the thimble joint, seal section and second reducing section all overlap and locate on the straight section.

Further, the inner diameter of the first reducing section is larger than the outer diameter of the thimble joint, the inner diameter of the second reducing section is larger than the outer diameter of the straight section, the inner diameter of the sealing section is equal to the outer diameter of the straight section, and the cavity layer is a cavity enclosed between the inner wall of the second reducing section and the outer wall of the straight section.

Furthermore, the inner diameter of the first reducing section is 1.5-3.5 times of the outer diameter of the thimble connector, and the inner diameter of the second reducing section is 1.3-1.8 times of the outer diameter of the straight section.

Further, the inner diameter of the outer conductor is equal to the outer diameter of the first variable diameter section, and the axial length of the outer conductor is equal to the axial length of the signal isolation layer.

Furthermore, the axial length of the shell is greater than that of the signal isolation layer, and the inner diameter of one end, far away from the connector, of the shell is 1.3-1.8 times of the outer diameter of the signal isolation layer.

Compared with the prior art, the utility model designs a brand-new Fakra radio frequency connector with information isolation structure has built the cavity layer between the inner wall of second reducing section and the outer wall of straight section to cooperate with its outer conductor, constituted inside cavity air block mixed structure, carry out the analysis to the characteristic impedance of this kind of structure, wherein characteristic impedance is:

wherein, under the coaxial transmission line framework, the value of the characteristic impedance exhibited by the coaxial transmission line depends on the relative dielectric constant of the insulating medium, the inner diameter of the outer conductor and the outer diameter of the inner conductor, and when the insulating medium is air, the characteristic impedance under the coaxial transmission line framework is as follows:

as can be seen from the above formula, in the case that the insulating medium is air, since the relative dielectric constant of air is 1, for the characteristic impedance under the coaxial transmission line structure, except for the inner diameter of the outer conductor and the outer diameter of the inner conductor, the influence of the structural parameters on the characteristic impedance is minimal, and since the influence of the surrounding vibration or the continuous interference on the dielectric constant can be substantially completely avoided, the influence on the connector in the complex surrounding environment is less, and finally, the VSWR (Voltage Standing Wave Ratio) and the Insertion Loss (Insertion Loss) performance in the transmission quality of the rf signal of the rf connector are significantly improved.

Drawings

FIG. 1 is a schematic view of the Fakra RF connector with the middle fast isolation structure of the present invention

FIG. 2 is a graph of transmission quality insertion loss test results for a prior art Fakra RF connector;

fig. 3 is a transmission quality insertion loss test result diagram of the Fakra rf connector with high transmission quality of the present invention.

In the figure: 1. the structure comprises a shell, 2, a signal isolation layer, 3, an inner conductor, 4, a connector, 5, a cavity layer, 6, an outer conductor, 21, a first variable-diameter section, 22, a sealing section, 23, a second variable-diameter section, 31, a bending section, 32, an ejector pin connector, 33 and a straight section.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Examples

Fakra radio frequency connector with information isolation structure includes shell 1 and joint 4 and the PCB board of connector, shell 1 in by skin to inlayer cover in proper order and be equipped with outer conductor 6, signal isolation layer 2 and inner conductor 3, outer conductor 6 be connected with joint 4 on the PCB board with welded fastening, signal isolation layer 2 be the insulator material, signal isolation layer 2 and inner conductor 3 between be equipped with inclosed cavity layer 5, cavity layer 5 in fill and have the air.

Inner conductor 3 portion: the connector comprises a bending part 31 close to the connector 4, a thimble connector 32 far away from the connector 4 and a straight section 33 positioned between the bending part 31 and the thimble connector 32, wherein the bending part 31 is connected with the connector 4.

Cavity layer 5 portion: is provided between the straight section 33 and the signal isolation layer 2. The signal isolation layer 2 sequentially comprises a first reducing section 21, a sealing section 22 and a second reducing section 23 from one end far away from the connector 4, the first reducing section 21 is sleeved on the thimble connector 32, and the sealing section 22 and the second reducing section 23 are both sleeved on the straight section 33. The inner diameter of the first reducing section 21 is larger than the outer diameter of the thimble joint 32, the inner diameter of the second reducing section 23 is larger than the outer diameter of the straight section 33, the inner diameter of the sealing section 22 is equal to the outer diameter of the straight section 33, and the cavity layer 5 is a cavity enclosed between the inner wall of the second reducing section 23 and the outer wall of the straight section 33. The inner diameter of the first reducing section 21 is 1.5 to 3.5 times of the outer diameter of the thimble connector 32, the inner diameter of the second reducing section 23 is 1.3 to 1.8 times of the outer diameter of the straight section 33, and the proportion in the range can simultaneously meet the structural standard and the range with the minimum signal loss.

Outer conductor 6 portion: the inner diameter of the outer conductor is equal to the outer diameter of the first variable diameter section 21, that is, the outer conductor part is completely attached to the outer surface of the signal isolation layer 2, and the axial length of the outer conductor 6 is equal to the axial length of the signal isolation layer 2.

In the actual Insertion Loss verification, a conventional Fakra radio frequency connector structure body in the prior art is tested by taking the Insertion Loss (Insertion Loss) -10dB as a check standard, the communication frequency range of the test is from 1GHz to 6GHz, and it can be seen that below the frequency point of 3.8778GHz, the Insertion Loss (Insertion Loss) of the transmission quality of the radio frequency signal is below-10 dB, as shown in detail in fig. 2.

In practical verification, be applied to the utility model provides a Fakra radio frequency connector structure body, test communication frequency range by 1GHz to 6GHz, below 4.5556GHz frequency point, the radio frequency signal transmission quality insertion loss (insertionLoss) is below-10 dB, see in detail fig. 3.

By the aforesaid verify it can be seen, neotype Fakra radio frequency connector structure body, the internal cavity air block is put into in insulating medium to the moderate degree, obvious promotion Fakra radio frequency connector radio frequency signal transmission quality, reached the purpose of stably promoting the transmission bandwidth, promote to 4.5556GHz frequency point radio frequency signal transmission quality Return Loss by 3.8778GHz frequency point and all be below-20 dB, it is visible the technical scheme of the utility model gain obvious promotion effect in the aspect of radio frequency signal transmission quality and insertion Loss.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a Fakra radio frequency connector with information isolation structure, includes shell (1) and joint (4) and the PCB board of connector, its characterized in that, shell (1) in by outer to inlayer cover in proper order and be equipped with outer conductor (6), signal isolation layer (2) and inner conductor (3), outer conductor (6) be connected with joint (4) of welded fastening on the PCB board, signal isolation layer (2) be the insulator material, signal isolation layer (2) and inner conductor (3) between be equipped with inclosed cavity layer (5), cavity layer (5) in fill and have the air.

2. The Fakra RF connector with an evanescent isolation structure according to claim 1, wherein the inner conductor (3) comprises a bent portion (31) near the terminal (4), a pin terminal (32) far from the terminal (4), and a straight portion (33) between the bent portion (31) and the pin terminal (32), and the cavity layer (5) is disposed between the straight portion (33) and the signal isolation layer (2).

3. The Fakra RF connector with the information isolation structure as claimed in claim 2, wherein the signal isolation layer (2) comprises a first diameter-changing section (21), a sealing section (22) and a second diameter-changing section (23) in sequence from the end far away from the connector (4), the first diameter-changing section (21) is sleeved on the thimble connector (32), and the sealing section (22) and the second diameter-changing section (23) are sleeved on the straight section (33).

4. A Fakra rf connector with an extinction isolation structure according to claim 3, wherein the inner diameter of the first reducing section (21) is larger than the outer diameter of the thimble adapter (32), the inner diameter of the second reducing section (23) is larger than the outer diameter of the straight section (33), the inner diameter of the sealing section (22) is equal to the outer diameter of the straight section (33), and the cavity layer (5) is a cavity enclosed between the inner wall of the second reducing section (23) and the outer wall of the straight section (33).

5. The Fakra RF connector with the extinction isolation structure as claimed in claim 3, wherein the inner diameter of the first reducing section (21) is 1.5-3.5 times of the outer diameter of the thimble joint (32), and the inner diameter of the second reducing section (23) is 1.3-1.8 times of the outer diameter of the straight section (33).

6. A Fakra RF connector with an evanescent isolation structure according to claim 4, wherein the inner diameter of the outer conductor (6) is equal to the outer diameter of the first tapered section (21), and the axial length of the outer conductor (6) is equal to the axial length of the signal isolation layer (2).