CN214957295U

CN214957295U - Coaxial radio frequency cable

Info

Publication number: CN214957295U
Application number: CN202121205068.5U
Authority: CN
Inventors: 茆新童; 茆永洲; 王剑锋
Original assignee: Nanjing Quancheng Transmission Technology Co ltd
Current assignee: Nanjing Quancheng Transmission Technology Co ltd
Priority date: 2021-06-01
Filing date: 2021-06-01
Publication date: 2021-11-30
Anticipated expiration: 2031-06-01

Abstract

A coaxial radio frequency cable comprises a conductor arranged at the center of the cable, wherein the outer side of the conductor is coated with an insulating layer; the conductor adopts a naked round copper conductor, and the outer side of the naked round copper conductor is coated with a foamed polyolefin insulating layer; the outer side of the foamed polyolefin insulating layer is provided with a total shielding layer, and the total shielding layer comprises a woven layer coated on the outer side of the foamed polyolefin insulating layer and an aluminum foil wrapping layer wrapped on the outer side of the woven layer; the outer side of the aluminum foil wrapping layer is sleeved with an outer sheath. The utility model adopts the arranged naked round copper conductor as the inner conductor and adopts the foamed polyolefin as the inner insulating layer, thereby effectively increasing the flexibility of the cable; and weave earlier, the setting around the covering after, can increase the roundness of cable, the effectual loss that reduces the cable.

Description

Coaxial radio frequency cable

Technical Field

The utility model relates to a cable communication technology field, concretely relates to coaxial radio frequency cable.

Background

The radio frequency coaxial cable is a cable which is provided with two concentric conductors, and the conductor and the shielding layer share the same axis. The nomenclature of radio frequency coaxial cable is related to its structure. Radio frequency coaxial cable is also one of the most common transmission media in local area networks. A pair of conductors for transmitting information is selected according to a structure that a layer of cylindrical outer conductor is sleeved outside an inner conductor (a thin core), the two conductors are mutually isolated by insulating materials, the centers of the outer conductor and a central axis core wire are on the same axis, so the coaxial cable is called a radio frequency coaxial cable, and the radio frequency coaxial cable is designed in such a way, so the transmission of abnormal signals interfered by external electromagnetic waves is also prevented.

At present, the conductors of the same products produced in China mostly adopt a single copper wire or a copper-clad aluminum wire, the cable is not flexible, the bending radius is larger, and the sheath is generally made of polyolefin materials and is not suitable for being repeatedly wound and dragged.

Disclosure of Invention

In view of the above technical problems, the present technical solution provides a coaxial rf cable, which can effectively solve the above problems.

The utility model discloses a following technical scheme realizes:

a coaxial radio frequency cable is suitable for transmitting radio frequency signals in radio communication broadcasting equipment and related radio electronic equipment, and is particularly suitable for radio frequency signal lines of relays and combiners; the cable comprises a conductor arranged at the center of the cable, wherein an insulating layer is coated on the outer side of the conductor; the conductor adopts a naked round copper conductor, and the outer side of the naked round copper conductor is coated with a foamed polyolefin insulating layer; the outer side of the foamed polyolefin insulating layer is provided with a total shielding layer, and the total shielding layer comprises an outer conductor woven layer coated on the outer side of the foamed polyolefin insulating layer and an outer conductor wrapping layer wrapped on the outer side of the outer conductor woven layer; an outer sheath is sleeved on the outer side of the outer conductor wrapping layer.

Furthermore, the bare round copper conductor is formed by coaxially twisting a plurality of bare copper wires, and the number of twisted turns of the plurality of bare copper wires is more than or equal to 5 turns in the length of 1 decimeter during twisting.

Furthermore, the foamed polyolefin insulating layer is made of a foamed polyethylene material or a foamed polypropylene material; the outer diameter of the foamed polyolefin insulating layer is 7.5-8 mm.

Further, the outer conductor braided layer adopts a tinned copper wire braided layer, and the braiding density is more than or equal to 90%.

Furthermore, the outer conductor wrapping layer adopts aluminum foil for wrapping, and the overlapping rate of wrapping is more than or equal to 20%.

Furthermore, the sheath is made of low-temperature-resistant elastomer material.

Further, the sheath is made of thermoplastic elastomer material.

Furthermore, the sheath is made of TPE materials.

Advantageous effects

The utility model provides an antenna cable that field communication car used, compare with prior art, it has following beneficial effect:

(1) according to the technical scheme, the bare round copper conductor is used as the inner conductor, and the foamed polyolefin is used as the inner insulating layer, so that the flexibility of the cable can be effectively improved; and weave earlier, the setting around the covering after, can increase the roundness of cable, the effectual loss that reduces the cable. The braided layer is arranged between the inner insulating layer and the wrapping layer, so that the friction force between the braided layer and the inner insulating layer can be increased, and the relative displacement is not easy to occur in the movement process of the cable; and a good coating effect between the insulating layer and the shielding layer is ensured, and the stability of the cable is ensured.

Drawings

Fig. 1 is a schematic cross-sectional view of the overall structure of the present invention.

Reference symbols in the drawings: 1-conductor, 2-insulating layer, 3-outer conductor braid, 4-outer conductor lapping layer, 5-outer sheath.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only some, but not all embodiments of the invention. Under the prerequisite that does not deviate from the design concept of the utility model, the ordinary person in the art should fall into the protection scope of the utility model to the various changes and improvements that the technical scheme of the utility model made.

Example 1:

as shown in fig. 1, a coaxial rf cable is suitable for transmitting rf signals in radio communication broadcasting equipment and related radio electronic equipment, and is particularly suitable for rf signal lines of relays and combiners; comprises a conductor 1 arranged at the center of the cable, and the outer side of the conductor 1 is coated with an insulating layer 2.

The conductor 1 is a bare round copper conductor which is formed by coaxially twisting a plurality of bare copper wires, and in the embodiment, in order to improve the flexibility of the product and reduce the bending radius, the bare round copper conductor is formed by coaxially twisting 30-40 tough-pitch copper wires with the diameter of 0.35-0.45 mm. When the plurality of bare copper wires are twisted, the number of twisting turns in the length of 1 decimeter is more than or equal to 5.

The outer side of the naked round copper conductor is coated with a foamed polyolefin insulating layer; the foamed polyolefin insulating layer is made of a foamed polyethylene material or a foamed polypropylene material; the outer diameter of the foamed polyolefin insulating layer is 7.5-8 mm.

The outer side of the foamed polyolefin insulating layer is provided with a total shielding layer, and the total shielding layer comprises an outer conductor woven layer 3 coated on the outer side of the foamed polyolefin insulating layer and an outer conductor wrapping layer 4 wrapped on the outer side of the outer conductor woven layer 3; the outer conductor braided layer 3 adopts a tinned copper wire braided layer, and the braiding density is more than or equal to 90%. The outer conductor wrapping layer 4 adopts aluminum foil for wrapping, and the overlapping rate of wrapping is more than or equal to 20%.

An outer sheath 5 is sleeved outside the outer conductor wrapping layer 4; the outer sheath 5 is made of low temperature resistant elastomer material. The outer sheath 5 is made of thermoplastic elastomer material, and in this embodiment, TPE material is used.

The technical requirements of the cable in the technical scheme are as follows:

1. conductor direct current resistance (+ 20 ℃ C.): 3.78 is not more than omega/km.

2. Insulation resistance: not less than 500M omega at +20 ℃.

3. Test voltage: the test piece is subjected to an alternating current 50Hz voltage test, the voltage value is 1000V, and the test time is 1 minute without breakdown.

4. The transmission performance of the cable is as follows:

(1) characteristic impedance: 50 +/-2 omega;

(2) return loss: VHF is more than or equal to 20dB, UHF is more than or equal to 18 dB;

(3) standing-wave ratio: 200-600 MHz is not more than 1.3;

(4) attenuation constant: less than or equal to dB/100 m.

Claims

1. A coaxial radio frequency cable comprises a conductor (1) arranged at the center of the cable, wherein the outer side of the conductor (1) is coated with an insulating layer (2); the method is characterized in that: the conductor (1) adopts a naked round copper conductor, and the outer side of the naked round copper conductor is coated with a foamed polyolefin insulating layer; the outer side of the foamed polyolefin insulating layer is provided with a total shielding layer, and the total shielding layer comprises an outer conductor woven layer (3) coated on the outer side of the foamed polyolefin insulating layer and an outer conductor wrapping layer (4) wrapped on the outer side of the outer conductor woven layer (3); the outer side of the outer conductor wrapping layer (4) is sleeved with an outer sheath (5).

2. A coaxial radio frequency cable according to claim 1, wherein: the bare round copper conductor is formed by coaxially twisting a plurality of bare copper wires, and when the plurality of bare copper wires are twisted, the number of twisted turns is more than or equal to 5 turns in the length of 1 decimeter.

3. A coaxial radio frequency cable according to claim 1, wherein: the foamed polyolefin insulating layer is made of a foamed polyethylene material or a foamed polypropylene material; the outer diameter of the foamed polyolefin insulating layer is 7.5-8 mm.

4. A coaxial radio frequency cable according to claim 1, wherein: the outer conductor braided layer (3) adopts a tinned copper wire braided layer, and the braiding density is more than or equal to 90%.

5. A coaxial radio frequency cable according to claim 1, wherein: the outer conductor wrapping layer (4) adopts aluminum foil for wrapping, and the overlapping rate of the wrapping is more than or equal to 20%.

6. A coaxial radio frequency cable according to claim 1, wherein: the sheath (5) is made of low-temperature-resistant elastomer material.

7. A coaxial radio frequency cable according to claim 1, wherein: the sheath (5) is made of thermoplastic elastomer material.

8. A coaxial radio frequency cable according to claim 1, wherein: the sheath (5) is made of TPE materials.