KR20230113439A - Coaxial Cable Assembly - Google Patents

Abstract

The coaxial cable assembly is a coaxial cable including an inner conductor, an insulation part surrounding the inner conductor, an outer conductor covering the outside of the insulation part, and a jacket surrounding the outer conductor, and an inner connecting conductor connected to the inner conductor, an insulator surrounding the inner connecting conductor, It includes a coaxial connector including a body accommodating the insulator on the inside, a coupling nut for fastening with a corresponding connector on one end of the body, and a back nut fastened to the body on the other end of the body, and one side of the outer conductor and the body has an inwardly rounded portion inwardly rounded toward the axial center of , and the other side receives a portion of the inwardly rounded portion and has an outwardly rounded portion corresponding to the shape of the inwardly rounded portion.

Description

Coaxial Cable Assembly {Coaxial Cable Assembly}

The present invention relates to a coaxial cable assembly, and more particularly, to a coaxial cable assembly that increases contact force between a coaxial connector and a coaxial cable.

IM (Intermodulation) means that when signals with multiple frequencies pass through a nonlinear system or circuit, signals that are not in the input at the output end are intermodulated, and IMD (Intermodulation distortion) is distortion caused by such intermodulation components. means Unlike analog systems in the field of mobile communication, digital systems such as LTE (Long Term Evolution) do not use one channel for signals with one frequency, but signals with multiple frequencies share a wide channel bandwidth. It is mainly a problem in digital systems.

This problem mainly occurs in passive devices as well. That is, since the passive element does not perform a perfect linear motion, IMD is generated due to the nonlinear motion, and the IMD generated by the passive element is called PIMD (Passive Intermodulation Distortion). PIMD is known to be caused by incomplete mechanical contact of metal conductors and contamination of dielectrics in passive devices, as well as oxidation of ferromagnetic materials, metals or plating surfaces, and scratches on plating surfaces.

In a mobile communication infrastructure, a medium that transmits a radio frequency (RF) signal between an antenna for transmitting and receiving radio waves and communication equipment for transmitting and receiving radio signals is a coaxial cable, and the coaxial cable is connected to the antenna and communication equipment through a coaxial connector. do. That is, the RF signal may be transmitted through a coaxial cable assembly in which coaxial connectors are coupled to both ends of the coaxial cable and electrically connected to each other.

In general, in order to couple a coaxial cable and a coaxial connector in the form of a coaxial cable assembly, each corresponding component is forced into contact with each other and then fixedly coupled. In this case, the coaxial cable and the coaxial connector may be welded or soldered to fundamentally block mechanical incomplete contact, which is a fundamental cause, in order to prevent deterioration of PIM characteristics.

However, when the coaxial cable coupled to the coaxial connector is installed outside, the relative contact state changes due to the external environment, such as twisting or rotating the coaxial cable with respect to the coaxial connector due to wind and external shock, resulting in poor PIM characteristics. there is a problem.

Accordingly, an object of the present invention is to provide a coaxial cable assembly capable of improving dynamic PIM characteristics even when the coaxial cable is twisted or bent with respect to the coaxial connector due to wind, external shock, etc., which may deteriorate mutual contact.

A coaxial cable assembly according to the present invention for achieving the above object is a coaxial cable including an inner conductor, an insulation part surrounding the inner conductor, an outer conductor surrounding the outside of the insulation part, and a jacket surrounding the outer conductor; And an inner connecting conductor connected to the inner conductor, an insulator surrounding at least a portion of the inner connecting conductor, a body accommodating the insulator inside, a coupling nut for fastening with a corresponding connector at one end of the body, and the body A coaxial connector including a back nut coupled to the body at the other end of the body, wherein one side of the outer conductor and the body has an inwardly rounded portion inwardly rounded toward an axis of one side, and the other side receives a portion of the inwardly rounded portion. and an outwardly rounded portion corresponding to the shape of the inwardly rounded portion. The inward rounding part and the outward rounding part are fixed in contact with each other by the coupling nut, and even when the coaxial cable and the coaxial connector are mutually twisted or rotated by external factors, the inward rounding part faces along the surface of the outward rounding part. Since it rotates while being contacted and maintains a perfect contact state, dynamic PIM characteristics can be improved.

Here, if the outer conductor includes the outward rounding portion and the body includes the inwardly rounding portion, it is preferable to maintain complete contact even when relatively twisted or rotated.

The coaxial connector may further include a sleeve ring accommodated inside the back nut. A coaxial cable is desirable because it can be firmly coupled to the coaxial connector.

Here, when the sleeve ring is coupled to the body and the coupling nut, in the longitudinal direction of the coaxial cable, the outer rounding portion is in surface contact with the opposite surface of the inwardly rounding portion and abutting surface, and is relatively twisted or rotated when disposed so as to be in contact Even in the case of surface contact with each other, it is preferable to maintain a complete contact state to improve dynamic PIM characteristics.

And, if the contact part of the sleeve ring that is in surface contact with the outward rounding part has a shape corresponding to the inward rounding part, it is possible to maintain a complete contact state while making surface contact with each other.

Here, when the outer diameter (A) of the end region of the outward rounding part is 1.2 to 1.6 compared to the inner diameter (B) of the outward rounding part, the inward rounding part can be relatively rotated on the inner surface of the outward rounding part even when it is relatively twisted or rotated. It is desirable to have

Further, when the length (C) of the outer rounding part in the longitudinal direction of the coaxial cable is 0.1 to 0.3 relative to the inner diameter (B) of the outer rounding part, the coaxial cable and the coaxial connector can rotate relatively.

Here, it is preferable that the outer conductor has a tubular shape without wrinkles because the manufacturing process can be simple.

In addition, if the inward rounding part and the outward rounding part have the same curvature in the rounding area, they can maintain perfect contact while making surface contact with each other even when relative rotation or twisting occurs due to external physical force such as wind.

Here, the inward rounding part and the outward rounding part are in surface contact with each other, and when they are relatively rotated, dynamic PIM characteristics can be improved.

In addition, if the outward rounding part accommodates the inward rounding part so as not to move in the longitudinal direction of the outer conductor, it is possible to maintain surface contact even when the coaxial cable is severely twisted or rotated with respect to the coaxial connector.

Here, when one side of the inner connecting conductor and the inner conductor is elastically accommodated and connected to the other side, dynamic PIM characteristics can be improved.

On the other hand, the coaxial connector according to the present invention for achieving the above object, an inner connecting conductor, an insulator surrounding at least a portion of the inner connecting conductor, a body accommodating the insulator on the inside, a corresponding connector on one end of the body and an outer side of the body A coaxial connector including a coupling nut for fastening, a back nut fastened to the body at the other end of the body, and a sleeve ring accommodated inside the back nut, wherein the body includes an inwardly rounded portion toward an axis center And, when the body and the bag nut are coupled, an empty space between the inward rounding portion and the sleeve ring is reduced in the cable length direction.

Here, when the back nut has a protrusion for pressing the sleeve ring when the body and the back nut are coupled, the coaxial cable and the coaxial connector can be firmly coupled.

On the other hand, the coaxial cable according to the present invention for achieving the above object includes an inner conductor, an insulation portion surrounding the inner conductor, an outer conductor surrounding the outside of the insulation portion, and a jacket surrounding the outer conductor, wherein the outer conductor Has a tubular shape without wrinkles, and may have an outwardly rounded portion in which both ends of the external conductor are outwardly rounded.

According to the present invention, the inward rounding part and the outward rounding part are fixed in a state of contact with each other by the coupling nut, and even when the coaxial cable and the coaxial connector are mutually twisted or rotated by external factors, the inward rounding part maintains the surface of the outward rounding part. It rotates while making surface contact along the surface to maintain a complete contact state, so that the contact state of the inner connecting conductor of the coaxial connector and the inner conductor of the coaxial cable can be maintained the same, thereby improving the dynamic PIM characteristics.

1 is a perspective view of a coaxial cable assembly according to the present invention.
2 is an exploded perspective view of the coaxial cable assembly of FIG. 1;
3 is a detailed view of an outwardly rounded portion of an outer conductor.
4 is an exemplary view of assembly and operation of a coaxial cable assembly.
5 is a diagram illustrating an operation of an inward rounding part and an outward rounding part.
6 is a detailed view of a coaxial cable.
7 is an exemplary view of a coaxial cable having a corrugated outer conductor.

Hereinafter, a coaxial cable assembly 1 according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Recently, as the frequency bandwidth of mobile communication is widened, multi-carriers are used, and frequency aggregation technologies such as CA (Carrier Aggregation) are used, PIMD requirements by multi-carriers are being strengthened. PIMD is an important electrical characteristic of passive elements of mobile communication such as antennas, filters, coaxial cables for RF signals, and RF coaxial connectors. If the PIM characteristic is high, it acts as an interference in the channel or adjacent channels, lowers the signal to noise ratio (SNR) defined as signal power / noise power of communication equipment, and consequently increases the power consumption of the system. Reduce system coverage. PIM characteristics are known to be caused by oxidation of a ferromagnetic substance, metal or plating surface, scratches on the plating surface, etc. in addition to incomplete mechanical contact of metal conductors and contamination of dielectrics in passive devices. Gender has a cause. These nonlinearities are largely divided into contact nonlinearity and material nonlinearity. In the former case, there is a tunneling effect by a metal oxide film and a micro-discharge of micro-cracks. In the latter case, ferromagnetism of a metal material such as nickel Ferromagnetism) and hysteresis effect. Among the above causes, the dynamic PIM characteristics have a large influence due to incomplete mechanical contact of the cable generated inside the connector by external kinetic energy. This is because when the rotation test method defined in IEC-62037-2 (2012) is followed, the inner/outer conductors and connectors of the cable cannot be stably fixed, friction occurs, and incomplete contact occurs when the cable rotates. because this happens Therefore, it is necessary to supplement the mechanical structure that can improve the dynamic PIM characteristics by improving the fixing force of the connector and cable.

1 is a perspective view of a coaxial cable assembly 1 according to the present invention, and FIG. 2 is an exploded perspective view of the coaxial cable assembly 1 of FIG. 1 .

The coaxial cable assembly 1 includes a coaxial cable 10 and a coaxial connector 20.

The coaxial cable 10 may include an inner conductor 11 , an insulation part 12 , an outer conductor 13 and a jacket 14 .

The inner conductor 11 may be made of copper or copper-clad aluminum (CCA) material, and is accommodated inside the insulating part 12 .

The insulation unit 12 may be made of polyethylene or high density polyethylene (HDPE). The insulating part 12 may be configured to be filled between the inner conductor 11 and the outer conductor 13 by a foaming process.

The outer conductor 13 may accommodate the insulating part 12 therein, and may be made of a material such as copper or aluminum. The external conductor 13 may be formed in a corrugated structure with reinforced flexibility and rigidity. An outwardly rounded portion 131 having an outwardly rounded shape including a portion expanding radially from the axial center of the external conductor 13 may be formed at one end region of the external conductor 13 .

Referring to FIG. 7, the corrugated structure of the outer conductor of the coaxial cable is a structure applied to improve the flexibility of the cable. Therefore, a cable with a relatively large outer diameter should have a corrugated structure, but a cable with a small outer diameter may have excellent bending characteristics without corrugations. That is, a cable having a dielectric outer diameter of less than 12D (dielectric outer diameter of about 12 mm) may have a structure without wrinkles on the outer conductor.

The coaxial cable assembly 1 having excellent PIM characteristics can be easily manufactured by applying a structure in which a corrugated outer conductor includes a connector component engaged with the corrugated structure between the body and the back nut to increase coupling force.

However, a SWT (smooth wall type) coaxial cable having an external conductor without corrugation cannot apply a connector component that engages with the structure, and therefore, coupling force is improved through the outward rounding portion 131.

The jacket 14 may be coated on the outside of the outer conductor 150 while surrounding and accommodating the outer conductor 13, and may be made of flame retardant polyethylene (FRPE, Fire Retardant Polyethylene) or flame retardant polyvinyl chloride (PVC), etc. can be made with

The coaxial connector 20 may include an inner connecting conductor 21 , an insulator 22 , a body 23 , a coupling nut 24 , a back nut 25 and a sleeve ring 26 .

The inner connecting conductor 21 is connected to the inner conductor 11 of the coaxial cable 10. The inner connecting conductor 21 is configured in the form of a male connector pin, and is connected to the inner conductor 11 of the coaxial cable 10, and the body 23 constituting the coaxial connector 200 is It can be connected with the outer conductor 13 of the coaxial cable.

The inner connecting conductor 21 has one end within the body 23 extending toward the direction in which the bag nut 25 is disposed, and the other end extending toward the direction in which the coupling nut 24 is disposed. there is. One end of the inner connecting conductor 21 extending in the direction in which the back nut 25 is disposed is inserted into the inner conductor 11 of the coaxial cable 10 coupled with the coaxial connector 20, and the coupling nut ( The other end of the inner connecting conductor 21 extending in the direction in which 24) is disposed may be connected to a female inner connecting conductor of a corresponding connector (not shown) corresponding to the coaxial connector 20, and the coaxial connector 20 The body 23 of the body 23 may also be connected to the body of the corresponding connector.

The insulator 22 serves to electrically insulate the internal connecting conductor 21 by mounting it while maintaining a relative structure inside the body 230 . In addition, the insulator 22 may be provided with a conductor coupling portion 232 to which the inner conductor 11 can be connected.

The body 23 accommodates the insulator 22 therein, is coupled with the coupling nut 24 at one end thereof, and may be coupled with the back nut 25 at the other end thereof. As shown in FIGS. 4 and 5 , the body 23 may have an inwardly rounded portion 231 including an inwardly rounded portion radially reduced in diameter toward the shaft center at one end area.

The coupling nut 24 is fastened to one end of the body 23 and may be fastened to the body of another corresponding connector (not shown).

The back nut 25 may be fastened to the body 23 at the other end of the body 23 opposite to one end of the body 23 to which the coupling nut 24 is fastened. The back nut 25 and the body 23 may be coupled by an engagement. For example, a thread is formed on the outer circumferential surface of one end of the back nut 25 facing the body 23, and a thread is formed on the inner circumferential surface of the other end of the body 23 in response to the thread of the back nut 25 and the body 23. ) may be coupled by a screw thread. An O-ring (not shown) for waterproofing may be disposed on an inner circumferential surface of the back nut 25 . The bag nut 25 may include a protrusion 261 that presses the sleeve ring 26 when the body 23 and the bag nut 25 are coupled.

The sleeve ring 26 is received inside the bag nut 25 and secures the outer conductor of the coaxial cable. In the process of assembling the coaxial cable and the coaxial connector, when the body 23 and the bag nut 25 are coupled, the protrusion 261 of the back nut makes strong contact between the inward rounding part 231 and the outward rounding part 131. 26) in the direction of the end of the connector. The contact portion of the sleeve ring 26 that comes into surface contact with the outwardly rounded portion 131 has a shape corresponding to that of the inwardly rounded portion 231 .

When the body 23 and the coupling nut 24 are coupled, the sleeve ring 26 is in surface contact with the surface opposite to the surface abutting the inward rounding part 231 of the outward rounding part 131 in the length direction of the coaxial cable 10 and can be placed so that they are in contact with each other.

The outwardly rounded portion 131 of the outer conductor 13 and the inwardly rounded portion 231 of the body 23 may be formed to be in surface contact with each other and relatively rotated. The outwardly rounded portion 131 of the outer conductor 13 and the inwardly rounded portion 231 of the body 23 are flat to a predetermined angle even when the coaxial cable 10 is twisted or rotated relative to the coaxial connector 20. It can be formed so that it can be rotated relative to each other while maintaining contact.

Here, the outwardly rounded portion 131 of the outer conductor 13 and the inwardly rounded portion 231 of the body 23 may be formed to have a similar curvature in the rounding area, and preferably, the outwardly rounded portion of the outer conductor 13 When the radius of curvature R _outward in the rounding area of the part 131 and the radius of curvature R _inward in the rounding area of the inwardly rounding part 231 of the body 23 are 0.5 to 2 times, excellent dynamic PIM characteristics can be secured. there is.

The outward rounding portion 131 of the outer conductor 13 accommodates the inwardly rounding portion 231 of the body 23 and forms an outwardly rounded portion 131 and an inward rounding in the longitudinal direction of the body 23 or the outer conductor 13. The parts 231 may have a shape that prevents them from moving in a direction away from each other.

One side of the inner connecting conductor 21 of the coaxial connector may be formed to be elastically received and coupled to one side of the inner conductor 11 of the coaxial cable. The shape of the inner connecting conductor 21 and the inner conductor 11 can be any shape as long as it is elastically connected, and is not limited to any one shape.

3 is a detailed view of the outwardly rounded portion 131 of the outer conductor 13.

The outward rounding portion 131 is formed to have a circular cross section as the external conductor 13 extends in the longitudinal direction and then expands with an outward inclination rather than the extension direction. As a result, even if the inward rounding portion 231 is seated and rotated in a state of surface contact, a complete contact state can be maintained.

4 is an exemplary view of assembly and operation of the coaxial cable assembly 1 .

4 (a) the inwardly rounded portion 231 of the coaxial connector 20 is disposed toward the right side, and the outwardly rounded portion 131 of the coaxial cable 10 on the right side faces the inwardly rounded portion 231 on the left side. are placed

4 (b), a worker moves the coaxial cable 10 or the coaxial connector 20 so that the inwardly rounded portion 231 is accommodated in the outwardly rounded portion 131, and then the coupling nut is coupled and fixed. Here, welding and soldering operations may be additionally performed.

4 (c) When the coaxial cable 10 is bent so as not to be coaxial with respect to the coaxial connector 20 in a state where the inward rounding part 231 is coupled to be accommodated in the outward rounding part 131, the outward rounding part 131 is rotated in a state of contact along the outer surface of the inwardly rounded portion 131 . Even when the coaxial cable 10 and the coaxial connector 20 are rotated relative to each other due to wind blowing while the coaxial cable 10 and the coaxial connector 20 are coupled, the inward rounding portion 231 and the outward rounding portion ( 131) is rotated while being in surface contact, so that a complete contact state can be maintained. Accordingly, the contact state between the inner connecting conductor 21 of the coaxial connector 20 and the inner conductor 11 of the coaxial cable 10 can be maintained in the same manner.

5 is a view illustrating an operation of the inward rounding part 231 and the outward rounding part 131 .

5 (a), the outwardly rounded portion 131 is coupled to the outside of the inwardly rounded portion 231 while being in surface contact with it. The outward rounding portion 131 accommodates the inwardly rounding portion 231 and has a structure preventing them from being spaced apart in a mutually distant direction.

5 (b) when the coaxial cable 10 is rotated upwardly with respect to the coaxial connector 20, the outwardly rounded portion 131 rotates while maintaining surface contact with the inwardly rounded portion 231. When rotatably coupled with such a structure, perfect contact can be maintained, and dynamic PIMD performance is achieved by increasing the contact force between the inner connecting conductor 21 of the coaxial connector 20 and the inner conductor 11 of the coaxial cable 10. can improve

6 is a detailed view of coaxial cable 10 .

The outer conductor 13 of the coaxial cable 10 may have an outwardly rounded portion 131 . However, as shown in FIG. 6 , the outwardly rounded portion 131 may be formed by being bent outwardly, and the outwardly rounded portion 131 formed by being bent outwardly may have a trumpet-shaped tubular shape.

An ideal angle range (α) of the trumpet-shaped tube may be 30 degrees to 50 degrees in order to form a coupling structure for excellent PIM characteristics.

In addition, in order to form a coupling structure for excellent PIM characteristics, the outer diameter (A) of the end region of the outward rounding portion 131, the inner diameter (B) of the outward rounding portion 131, and the outward rounding portion 131 The length C of the coaxial cable 10 in the longitudinal direction may form the following predetermined relationship.

A/B = 1.2 to 1.6

C/B = 0.1~0.3

More specifically, when the inner diameter (B) of the outward rounding portion 131 having a trumpet-shaped tube shape (based on 10D coaxial cable) is 9.4±0.2 mm, the outward rounding portion having a trumpet-shaped tube shape The outer diameter (A) of the distal region of (131) may be 13.1 ± 1.0 mm, and the length (C) in the longitudinal direction of the coaxial cable (10) of the outwardly rounded portion (131) having a trumpet-shaped tubular shape is 2.0 It can be provided with ±0.2mm.

In addition, when the inner diameter (B) of the outward rounding portion 131 having a trumpet-shaped tubular shape (based on 12D coaxial cable) is 13.1 ± 0.2 mm, the outward rounding portion 131 having a trumpet-shaped tubular shape The outer diameter (A) of the end region of may be 17.5 ± 1.0 mm, and the length (C) in the longitudinal direction of the coaxial cable 10 of the outward rounding portion 131 having a trumpet-shaped tubular shape is 2.5 ± 0.2 mm. can be provided with

The ideal angular range (α) of the trumpet-shaped tube, the outer diameter (A) of the end area of the outwardly rounded portion 131 having a trumpet-shaped tube shape, and the inner diameter of the trumpet-shaped outwardly rounded portion 131 (B) and the length (C) in the longitudinal direction of the coaxial cable 10 of the outward rounding portion 131 having a trumpet-shaped tubular shape, the coaxial cable 10 and the coaxial connector 20 are interconnected by external factors. These are conditions that can ensure that the contact state of the inner conductor remains the same even when twisted or rotated.

In order to evaluate the dynamic PIM characteristics of the coaxial connector assembly to which the outward rounding portion is applied according to the present invention, the following test was performed.

The test method was performed in both directions (connector A→B side, connector B→A side) according to the IEC-62037-2 standard while the connectors (connector A, connector B) at both ends of each coaxial connector assembly sample were connected to the PIM instrument. PIM values were measured. At this time, considering the measurement error, the average value of each measurement was evaluated for the same sample three times.

The evaluation target was a SWT coaxial cable assembly sample with a length of 1 m, and four assemblies each having N/DIN/4.3-10 (male) connectors at both ends of the coaxial cable were manufactured.

The evaluation criterion was determined to satisfy excellent PIM characteristics if the maximum measured value during the dynamic test was -153dBc or less and the measured value was -160dBc or less after the dynamic test.

(1) Comparative Example was manufactured with an N-type (male) connector at both ends of the coaxial cable and a general coupling structure without an outward rounding portion.

sample number connector PIM level measurement Static Max value during Dynamic test After dynamic test Measures
[dBc] Measures
[dBc] difference
[dB] Measures
[dBc] difference
[dB] 1-1 A -159.5 -146.0 13.5 -153.2 6.3 B -165.9 -151.0 14.9 -156.2 9.7 1-2 A -158.0 -149.0 9.0 -158.4 -0.4 B -171.1 -145.0 26.1 -161.9 9.2 1-3 A -167.1 -155.0 12.1 -153.6 13.5 B -170.4 -148.0 22.4 -160.2 10.2 1-4 A -165.6 -160.0 5.6 -157.6 8.0 B -159.1 -147.0 12.1 -159.6 -0.5 avg -164.6 -150.1 14.5 -157.6 7.0

As a result of the evaluation with reference to Table 1, since all samples had a PIM value greater than -153 during the dynamic test and all samples had a PIM value greater than -160 after the dynamic test, it could be seen that the PIM characteristics of the samples were significantly deteriorated by external forces. Yes (FAIL).

(2) In Example 1, N-type (male) connectors were provided at both ends of the coaxial cable, and an outer rounding portion was applied to the coupling structure. Comparison of the effect of applying the coupling structure of the present invention as a coaxial cable assembly having the same connector as the comparative example is as follows.

sample number connector PIM level measurement Static Dynamic
Max during testing Dynamic
after the test Measures
[dBc] Measures
[dBc] difference
[dB] Measures
[dBc] difference
[dB] 2-1 A -166.3 -154.0 12.3 -167.1 -0.8 B -168.2 -153.0 15.2 -161.8 6.4 2-2 A -175.5 -153.0 22.5 -160.9 14.6 B -161.4 -155.0 6.4 -165.4 -4.0 2-3 A -159.9 -153.0 6.9 -164.6 -4.7 B -167.4 -156.0 11.4 -167.2 0.2 2-4 A -165.6 -157.0 8.6 -160.8 4.8 B -156.3 -155.0 1.3 -163.2 -6.9 avg -165.1 -154.5 10.6 -163.9 1.2

As a result of the evaluation with reference to Table 2, it can be confirmed that all samples have excellent PIM characteristics compared to the evaluation criteria during and after the dynamic test (PASS). In particular, it can be seen that the difference between the initial PIM value (static) before the dynamic test and the measured value during the dynamic evaluation test and after the test is relatively reduced compared to the comparative example. This indicates that the effect of the dynamic evaluation situation on the PIM characteristics of the sample is reduced.

(3) Embodiment 2 was manufactured with DIN type (male) connectors at both ends of the coaxial cable and a coupling structure applying an outward rounding portion.

sample number connector PIM level measurement Static Dynamic
Max during testing Dynamic
after the test Measures
[dBc] Measures
[dBc] difference
[dB] Measures
[dBc] difference
[dB] 3-1 A -177.7 -158.0 19.7 -176.3 1.4 B -173.8 -158.0 15.8 -172.2 1.6 3-2 A -177.7 -162.0 15.7 -173.4 4.3 B -175.1 -163.0 12.1 -172.2 2.9 3-3 A -166.8 -159.0 7.8 -172.0 -5.2 B -165.9 -158.0 7.9 -168.1 -2.2 3-4 A -170.7 -160.0 10.7 -169.0 1.7 B -169.4 -159.0 10.4 -167.4 2.0 Avg -172.1 -159.6 12.5 -171.3 0.8

As a result of the evaluation with reference to Table 3, during dynamic evaluation and after evaluation, it can be confirmed that all samples have excellent PIM characteristics compared to the evaluation criteria (PASS), and in particular, DIN with excellent cable coupling compared to the N-type connector of Example 1 A connector is applied to show better PIM characteristics.

(4) Example 3 was manufactured with a 4.3-10 type (male) connector at both ends of the coaxial cable and a coupling structure applying an outward rounding portion. Regardless of the type of connector, it shows that the coupling structure of the present invention has an effect.

sample number connector PIM level measurement Static Dynamic
Max during testing Dynamic
after the test Measures
[dBc] Measures
[dBc] difference
[dB] Measures
[dBc] difference
[dB] 4-1 A -171.2 -157.0 14.2 -170.0 1.2 B -169.8 -160.0 9.8 -168.9 0.9 4-2 A -178.1 -159.0 19.1 -177.3 0.8 B -173.5 -157.0 16.5 -175.3 -1.8 4-3 A -170.7 -162.0 8.7 -168.8 1.9 B -171.7 -162.0 9.7 -171.4 0.3 4-4 A -166.3 -157.0 9.3 -161.0 5.3 B -168.4 -160.0 8.4 -169.6 -1.2 avg -171.2 -159.3 12.0 -170.3 0.9

As a result of the evaluation with reference to Table 4, during and after the dynamic evaluation, it can be confirmed that all samples have excellent PIM characteristics compared to the evaluation criteria (PASS). It shows excellent PIM characteristics.

In addition, through Examples 1 to 3, it can be confirmed that the outwardly rounded portion applied structure exhibits excellent PIM characteristics for all three types of coaxial connectors that are most commonly used.

Due to the above coaxial cable assembly 1, the inward rounding part and the outward rounding part are fixed in a mutually contacted state by the coupling nut, and even when the coaxial cable and the coaxial connector are twisted or rotated by external factors, Since the inward rounding part is rotated while being in surface contact along the surface of the outward rounding part, the contact state between the inner connecting conductor 21 of the coaxial connector 20 and the inner conductor 11 of the coaxial cable 10 can be maintained in the same manner, thus enabling dynamic PIM. characteristics can be improved.

1: coaxial cable assembly
10: coaxial cable 11: inner conductor
12: insulator 13: external conductor
131: outward rounding part 14: jacket
20: coaxial connector 21: inner connecting conductor
22: insulator 23: body
231: inward rounding portion 232: conductor coupling portion
24: coupling nut 25: back nut
26: sleeve ring 261: protrusion

Claims (15)

In the coaxial cable assembly,
A coaxial cable including an inner conductor, an insulation part surrounding the inner conductor, an outer conductor surrounding the outside of the insulation part, and a jacket surrounding the outer conductor; and
An inner connecting conductor connected to the inner conductor, an insulator surrounding at least a portion of the inner connecting conductor, a body accommodating the insulator inside, a coupling nut for fastening with a corresponding connector on the outside of one end of the body, and the body It includes a coaxial connector including a back nut fastened to the body at the other end,
One side of the outer conductor and the body has an inwardly rounded portion that is inwardly rounded toward the shaft center of one side, and the other side receives a portion of the inwardly rounded portion and has an outwardly rounded portion that is outwardly rounded in correspondence with the shape of the inwardly rounded portion. coaxial cable assembly.
According to claim 1,
The coaxial cable assembly according to claim 1 , wherein the outer conductor includes the outwardly rounded portion, and the body includes the inwardly rounded portion. According to claim 2,
The coaxial connector further comprises a sleeve ring accommodated inside the back nut.
According to claim 3,
The sleeve ring is a coaxial cable assembly, characterized in that disposed so as to come into contact with a surface opposite to a surface of the outward rounding portion in contact with the inward rounding portion in the longitudinal direction of the coaxial cable when the body and the coupling nut are coupled.
According to claim 4,
The coaxial cable assembly, characterized in that the contact portion of the sleeve ring that is in surface contact with the outward rounding portion and has a shape corresponding to the inwardly rounding portion.
According to claim 2,
The coaxial cable assembly, characterized in that the outer diameter (A) of the end region of the outward rounding portion relative to the inner diameter (B) of the outwardly rounding portion is 1.2 to 1.6.
According to claim 2,
The coaxial cable assembly, characterized in that the length (C) of the outer rounding portion in the longitudinal direction of the coaxial cable compared to the inner diameter (B) of the outer rounding portion is 0.1 to 0.3.
According to claim 1,
The outer conductor is a coaxial cable assembly, characterized in that the corrugated tubular shape.
According to claim 1,
The inwardly rounded portion and the outwardly rounded portion have the same curvature in a rounding area.
According to claim 1,
The coaxial cable assembly, characterized in that the inward rounding part and the outward rounding part are in surface contact with each other and relatively rotated.
According to claim 1,
The coaxial cable assembly according to claim 1, wherein the outward rounding portion accommodates the inwardly rounding portion so as not to move in the longitudinal direction of the outer conductor.
According to claim 1,
A coaxial cable assembly, characterized in that one side of the inner connecting conductor and the inner conductor is elastically received and connected to the other side.
An inner connecting conductor, an insulator surrounding at least a portion of the inner connecting conductor, a body accommodating the insulator inside, a coupling nut for fastening with a corresponding connector at one end of the body, and fastening with the body at the other end of the body It includes a coaxial connector including a bag nut and a sleeve ring accommodated inside the bag nut,
The coaxial connector, characterized in that the body has an inwardly rounded portion rounded inward toward the shaft center, and when the body and the back nut are coupled, an empty space between the inwardly rounded portion and the sleeve ring is reduced in a cable longitudinal direction.
According to claim 13,
The coaxial connector, characterized in that the back nut has a protrusion for pressing the sleeve ring when the body and the back nut are coupled.
Including an inner conductor, an insulating part surrounding the inner conductor, an outer conductor surrounding the outside of the insulating part, and a jacket surrounding the outer conductor,
The coaxial cable according to claim 1 , wherein the outer conductor has a tubular shape without corrugations, and both ends of the outer conductor have outwardly rounded outwardly rounded portions.