Radio-frequency coaxial connector

Abstract

The present invention relates to a radio-frequency coaxial connector, comprising: an outer conductor, a dielectric body, an inner conductor, and a cable, which are arranged in sequence from outside to inside, wherein the cable is fixed, by compression, to a compression terminal of the inner conductor; and a metal sleeve is disposed outside of the compression terminal of the dielectric body, an inner wall of the metal sleeve being used for exerting a radial compressing force on the dielectric body, thus making the dielectric body radially deform to press against the compression terminal of the inner conductor. In the present invention, by means of the metal sleeve arranged at the compression terminal of the dielectric body compressing the joint of the dielectric body and the inner conductor and pressing against the dielectric body to make same deform, the inner conductor presses and abuts against the dielectric body, preventing the joint of the inner conductor and the dielectric body from easily loosening due to vibrations in the environment, whilst also ensuring a signal transmission effect.

Description

A radio frequency coaxial connector Technical Field

[0001] The present invention relates to the technical field of connectors, and in particular to a radio frequency coaxial connector. Background Art

[0002] The RF coaxial connector includes an inner conductor, an outer conductor, a dielectric body (i.e., an insulator) and a shell. The shell, outer conductor and inner conductor are coaxial structures. The inner conductor and outer conductor are made of metal. During manufacturing, the inner conductor is first assembled into the dielectric body, and then the dielectric body and the inner conductor assembly are assembled into the outer conductor, and finally the outer conductor is assembled into the shell.

[0003] The crimping end of the inner conductor of the existing RF coaxial connector is located in the installation cavity inside the dielectric body. Since the installation cavity is filled with air, and the relative dielectric constant of air is smaller than the relative dielectric constant of the dielectric body, the equivalent dielectric constant of the RF coaxial connector at the crimping end of the inner conductor is relatively small, and the characteristic impedance at this position is relatively large, which is not conducive to stable signal transmission.

[0004] Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a radio frequency coaxial connector, and the specific technical solution is as follows:

[0006] A radio frequency coaxial connector comprises an outer conductor, a dielectric body, an inner conductor and a cable arranged in sequence from the outside to the inside. The cable is crimped and fixed to the wire-pressing end of the inner conductor. A mounting cavity is provided inside the dielectric body. The wire-pressing end of the inner conductor is located within the mounting cavity. A metal sleeve is sleeved on the outer wall of the dielectric body. The metal sleeve is in direct contact with the inner wall of the outer conductor to form an electrical connection. The wire-pressing end of the inner conductor is located inside the metal sleeve.

[0007] As an improvement to the above technical solution, the outer conductor, the dielectric body and the inner conductor are coaxially arranged, and the dielectric body includes a first part dielectric body and a second part dielectric body. The first part dielectric body is opposite to the wire-pressing end of the inner conductor in the radial direction of the outer conductor, and the second part dielectric body is opposite to the plug-in end of the inner conductor in the radial direction of the outer conductor; the equivalent dielectric constant of the RF coaxial connector at the position of the first part dielectric body is smaller than the equivalent dielectric constant of the RF coaxial connector at the position of the second part dielectric body.

[0008] As an improvement of the above technical solution, the metal sleeve is located between the outer wall of the first part of the dielectric body and the inner wall of the outer conductor.

[0009] As an improvement of the above technical solution, the outer surface of the metal sleeve is provided with at least one group of protrusions along its extension direction. The protrusions protrude from the outer wall of the metal sleeve. The elastic deformation of the protrusions in the radial direction causes the metal sleeve to contact the outer conductor to form an electrical connection.

[0010] As an improvement of the above technical solution, the inner wall of the metal sleeve has a radial squeezing force on the dielectric body to cause the dielectric body to deform radially and press the wire-pressing end of the inner conductor.

[0011] As an improvement of the above technical solution, the metal sleeve is a sheet-like winding part.

[0012] As an improvement of the above technical solution, the metal sleeve has at least one set of through grooves, and the through grooves correspond to the deformation areas of the protrusions.

[0013] As an improvement of the above technical solution, a connecting portion for covering by a metal sleeve is provided at the wire pressing end of the dielectric body, and a limiting step is further provided at one end of the dielectric body located at the connecting portion.

[0014] As an improvement of the above technical solution, the plug-in end of the inner conductor is provided with multiple groups of elastic arms, and the wire-pressing end of the inner conductor is provided with an integrally formed wire-wrapping structure for clamping the cable.

[0015] As an improvement to the above technical solution, the crimping end of the outer conductor is provided with a clamping piece, and a supporting sleeve is provided inside the clamping piece.

[0016] Beneficial effects of the present invention:

[0017] The equivalent dielectric constant of the RF coaxial connector at the dielectric body installation cavity position of the present invention is smaller than the equivalent dielectric constant of the RF coaxial connector at other positions of the dielectric body. By adding a metal sleeve inside the outer conductor, and the crimping end of the inner conductor is located inside the metal sleeve, since the metal sleeve is electrically connected to the outer conductor, the diameter of the outer conductor inner cavity can be reduced with the help of the metal sleeve, so that the characteristic impedance performance of the RF coaxial connector at the crimping end position of the inner conductor is improved, thereby improving the electrical performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front view of the overall structure of the present invention;

[0019] FIG2 is a schematic structural diagram of an inner conductor and a cable according to the present invention;

[0020] FIG3 is a schematic structural diagram of an outer conductor of the present invention;

[0021] FIG4 is a schematic structural diagram of a support sleeve according to the present invention;

[0022] FIG5 is a schematic diagram of the dielectric structure of the present invention;

[0023] FIG6 is a schematic structural diagram of a metal sleeve according to the present invention;

[0024] FIG7 is a schematic diagram of the installation structure of the dielectric body and the metal sleeve of the present invention;

[0025] FIG8 is a schematic diagram showing the positions of the inner conductor, outer conductor, and dielectric body of the present invention.

[0026] Figure numerals: 1, inner conductor; 2, cable; 3, outer conductor; 31, clamping piece; 4, supporting sleeve; 5, dielectric body; 51, connecting part; 52, limiting step; 6, metal sleeve; 61, protrusion; 62, through groove. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] A radio frequency coaxial connector includes an outer conductor 3, a dielectric body 5, an inner conductor 1, and a cable 2, arranged in sequence from the outside to the inside. The cable 2 is crimped and fixed to the crimping end of the inner conductor 1. The dielectric body 5 has an interior mounting cavity, and the crimping end of the inner conductor 1 is located within the mounting cavity. A metal sleeve 6 is sleeved on the outer wall of the dielectric body 5, and the metal sleeve 6 is in direct contact with the inner wall of the outer conductor 3 to form an electrical connection. The crimping end of the inner conductor 1 is located within the metal sleeve 6. The outer conductor 3, the dielectric body 5, and the inner conductor 1 are coaxially arranged. The dielectric body 5 includes a first dielectric portion and a second dielectric portion. The first dielectric portion faces the crimping end of the inner conductor 1 in the radial direction of the outer conductor 3, and the second dielectric portion faces the plug-in end of the inner conductor 1 in the radial direction of the outer conductor 3. The equivalent dielectric constant of the radio frequency coaxial connector at the location of the first dielectric portion is smaller than the equivalent dielectric constant of the radio frequency coaxial connector at the location of the second dielectric portion. The metal sleeve 6 is located between the outer wall of the first dielectric portion and the inner wall of the outer conductor 3.

[0029] The characteristic impedance formula of RF coaxial connector is:

[0030] RF coaxial connector equivalent dielectric constant ε e The calculation formula is:

[0031] In the formula (as shown in Figure 8),

[0032] D2 is the inner diameter of the outer conductor (mm);

[0033] D1 is the outer diameter of the medium (mm);

[0034] D is the outer diameter of the inner conductor (mm);

[0035] ε1 is the relative dielectric constant of the dielectric between D1 and d;

[0036] ε2 is the relative dielectric constant of the dielectric between D2 and D1 (the relative dielectric constant of air is 1);

[0037] In the present application, a metal sleeve 6 is added inside the outer conductor 3, and the crimping end of the inner conductor 1 is located inside the metal sleeve 6. Since the metal sleeve 6 is electrically connected to the outer conductor 3, the diameter of the inner cavity of the outer conductor 3 can be reduced with the help of the metal sleeve 6, so that the equivalent dielectric constant of the RF coaxial connector at the position corresponding to the crimping end of the inner conductor 1 is relatively small, and the diameter of the inner cavity of the outer conductor 3 at this position is also relatively small due to the setting of the metal sleeve 6, thereby improving the characteristic impedance performance of the RF coaxial connector at the position corresponding to the crimping end of the inner conductor 1, so that the characteristic impedance at each position of the RF coaxial connector remains basically unchanged / changes slightly, thereby improving the electrical performance of the product.

[0038] In addition, a metal sleeve 6 is provided outside the wire-pressing end of the dielectric body 5 , and the inner wall of the metal sleeve 6 has a radial squeezing force on the dielectric body 5 to radially deform the dielectric body 5 and press the wire-pressing end of the inner conductor 1 .

[0039] Referring to Figure 1, the insertion direction is the plug-in end, and the opposite direction is the crimping end. As shown in Figure 1, direction A is the plug-in end, and direction B is the crimping end. The outer conductor 3, the dielectric body 5, and the inner conductor 1 are coaxially arranged. The outer conductor 3 and the inner conductor 1 are fixed to each other through the dielectric body 5 therebetween. The dielectric body 5 is a hollow structure, and a cavity for installing the inner conductor 1 is provided therein. The metal sleeve 6 can squeeze the crimping end of the dielectric body 5, so that the dielectric body 5 then presses the contact between the inner conductor 1 and the cable 2, so that the connection is not easily loosened due to vibration in the environment.

[0040] In order to enable the metal sleeve 6 to squeeze the dielectric body 5 after winding, referring to Figure 6, the metal sleeve 6 is a sheet winding part. The metal sleeve 6 is a rectangular sheet that is rolled up by stamping and wrapped around the outside of the dielectric body 5. Therefore, it can give an extrusion force to the dielectric body 5 after winding.

[0041] In order to avoid the electrical properties between the metal sleeve 6 and the outer conductor 3 being difficult to adjust, which seriously affects the signal transmission performance of the entire product, referring to Figures 1, 6 and 7, the outer surface of the metal sleeve 6 is provided with at least one group of protrusions 61 along its extension direction. The protrusions 61 protrude from the outer wall of the metal sleeve 6. The elastic deformation of the protrusions 61 in the radial direction causes the metal sleeve 6 to contact the outer conductor 3 to form an electrical connection. Specifically, the outer conductor 3 is electrically connected to the metal sleeve 6 surrounding the outside of the dielectric body 5. During the insertion process of the metal sleeve 6, the protrusions 61 and the inner wall of the outer conductor 3 are squeezed and deformed, and the protrusions 61 are bent due to the extrusion. A restorative elastic force is generated, so that the protrusion 61 is tightly attached to the inner wall of the outer conductor 3, so that the metal sleeve 6 is connected to the outer conductor 3 through the protrusion 61. At the same time, the protrusion 61 can achieve a more stable limiting effect between the outer conductor 3 and the metal sleeve 6, which can provide a movement restriction for the metal sleeve 6 and avoid the problem of the metal sleeve 6 and the outer conductor 3 being separated. The protrusion 61 and the metal sleeve 6 are integrally formed, wherein the outer conductor 3 and the inner conductor 1 are formed by a stamping and rolling process. When the wiring harness assembly adopts a stamping part, the metal sleeve 6 is electrically connected to the outer conductor 3 in the wiring harness assembly, which can effectively improve the electrical performance of the wiring harness assembly.

[0042] In order to ensure the deformation amount of the protrusion 61, referring to Figure 6 or Figure 7, the metal sleeve 6 has at least one group of through grooves 62, and the through grooves 62 correspond to the deformation areas of the protrusion 61. The through grooves 62 can provide elastic deformation space for the protrusion 61, and can increase the radial deformation distance of the protrusion 61.

[0043] A connecting portion 51 for covering the metal sleeve 6 is provided at the wire-pressing end on the dielectric body 5. Referring to Figure 5, a limiting step 52 is further provided on the dielectric body 5 and at one end of the connecting portion 51. The connecting portion 51 covers the riveted portion of the inner conductor 1 and the cable 2. The limiting step 52 can limit the position of the metal sleeve 6 to avoid misalignment between the metal sleeve 6 and the wire-pressing end of the dielectric body 5.

[0044] In one embodiment, referring to Figure 1, one end of the inner conductor 1 is provided with multiple groups of elastic arms, and the other end of the inner conductor 1 is provided with an integrally formed wire wrapping structure for clamping the cable 2. Specifically, the elastic arms can improve the plugging and unplugging effect of the inner conductor 1, and the cable 2 is riveted through the wire wrapping structure.

[0045] In order to avoid the problem of damage to the outer conductor 3 and the cable 2 during the riveting process, referring to Figures 3 and 4, the crimping end of the outer conductor 3 is provided with a clamping piece 31, and a supporting sleeve 4 is provided inside the clamping piece 31. The supporting sleeve 4 can cover the surface of the cable 2, effectively preventing the impact force during the riveting process of the outer conductor 3 from damaging the cable 2.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A radio frequency coaxial connector, comprising an outer conductor (3), a dielectric body (5), an inner conductor (1) and a cable (2) arranged in sequence from the outside to the inside, wherein the cable (2) is crimped and fixed to the crimping end of the inner conductor (1), characterized in that: An installation cavity is provided inside the dielectric body (5), and the wire-pressing end of the inner conductor (1) is located inside the installation cavity. A metal sleeve (6) is sleeved on the outer wall of the dielectric body (5), and the metal sleeve (6) is in direct contact with the inner wall of the outer conductor (3) to form an electrical connection. The wire-pressing end of the inner conductor (1) is located inside the metal sleeve (6).

2. A radio frequency coaxial connector according to claim 1, characterized in that: The outer conductor (3), the dielectric body (5) and the inner conductor (1) are coaxially arranged, the dielectric body (5) comprises a first dielectric body and a second dielectric body, the first dielectric body being opposite to the crimping end of the inner conductor (1) in the radial direction of the outer conductor (3), and the second dielectric body being opposite to the plug-in end of the inner conductor (1) in the radial direction of the outer conductor (3); the equivalent dielectric constant of the radio frequency coaxial connector at the location of the first dielectric body is smaller than the equivalent dielectric constant of the radio frequency coaxial connector at the location of the second dielectric body.

3. A radio frequency coaxial connector according to claim 2, characterized in that: The metal sleeve (6) is located between the outer wall of the first dielectric body and the inner wall of the outer conductor (3).

4. The radio frequency coaxial connector according to claim 1, characterized in that: At least one group of protrusions (61) is provided on the outer surface of the metal sleeve (6) and along its extension direction. The protrusions (61) protrude from the outer wall of the metal sleeve (6). The protrusions (61) elastically deform in the radial direction so that the metal sleeve (6) contacts the outer conductor (3) to form an electrical connection.

5. The radio frequency coaxial connector according to claim 1, characterized in that: The inner wall of the metal sleeve (6) has a radial squeezing force on the dielectric body (5) so that the dielectric body (5) is radially deformed to press the wire end of the inner conductor (1).

6. The radio frequency coaxial connector according to claim 1, characterized in that: The metal sleeve (6) is a sheet-shaped winding part.

7. The radio frequency coaxial connector according to claim 4, characterized in that: The metal sleeve (6) has at least one group of through grooves (62), and the through grooves (62) correspond to the deformation areas of the protruding portions (61).

8. The radio frequency coaxial connector according to claim 1, characterized in that: A connecting portion (51) for covering the metal sleeve (6) is provided at the wire pressing end of the dielectric body (5), and a limiting step (52) is also provided at one end of the dielectric body (5) located at the connecting portion (51).

9. The radio frequency coaxial connector according to claim 2, characterized in that: The plug-in end of the inner conductor (1) is provided with a plurality of sets of elastic arms, and the wire-pressing end of the inner conductor (1) is provided with an integrally formed wire-wrapping structure for clamping the cable (2).

10. The radio frequency coaxial connector according to claim 1, characterized in that: The crimping end of the outer conductor (3) is provided with a clamping piece (31), and a supporting sleeve (4) is provided inside the clamping piece (31).

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