CN211530157U

CN211530157U - Ultralow-loss phase-stable microwave coaxial cable

Info

Publication number: CN211530157U
Application number: CN201922476583.6U
Authority: CN
Inventors: 何元元; 计克云; 姜绪宏; 吴浩; 吴本荣; 张少东; 刘美法
Original assignee: Anhui Hongyuan Special Cable Group Co ltd
Current assignee: Anhui Hongyuan Special Cable Group Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-18
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a steady looks microwave coaxial cable of ultralow loss, including inner conductor core, insulating layer, outer conductor circle and polyvinyl chloride sheath, the inner conductor core comprises sinle silk and first copper foil area, and the insulating layer comprises first hard foam area, thermoplastic elastomer sleeve pipe and the hard foam area of second, and the outer conductor circle comprises second copper foil area, copper mesh shielding layer and third copper foil area. The utility model adopts the first copper foil strip as the conductor shielding layer of the conductive wire core, which is used for eliminating the attenuation of the surface of the conductor; the insulating layer has the characteristics of large air content, small density, flexibility and flexibility, and the dielectric constant and dissipation factor in the microwave signal transmission process are greatly reduced; the outer conductor ring is a shielding structure forming a double interlayer, so that the dielectric constant and dissipation factor of signal divergence are further reduced, and the shielding effect on external environment signals is improved.

Description

Ultralow-loss phase-stable microwave coaxial cable

Technical Field

The utility model relates to a coaxial cable technical field especially relates to a steady looks microwave coaxial cable of ultralow loss.

Background

Microwave coaxial cables are widely used in the fields of radar, communication, computers, precision instruments and meters, medical tests and the like, and are indispensable elements of radio communication systems and electronic equipment.

With the increasing accuracy of signal attenuation tests of the inner conductor and the outer conductor of the coaxial cable in recent years, people have more profound understanding on the signal transmission principle of the coaxial cable, and the microwave coaxial cable is required to have basic characteristics of reliability, high bandwidth, high isolation and the like in the microwave signal transmission process, and also required to have new characteristics of low high-frequency loss, stable phase, light weight, softness and the like, so that great difficulty is provided for cable developers.

Microwave coaxial cables with ultra-high performance requirements require development of new cable structures.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art, and providing an ultralow-loss phase-stable microwave coaxial cable.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an ultra-low loss phase-stable microwave coaxial cable comprises an inner conductor core, an insulating layer arranged outside the inner conductor core, an outer conductor ring arranged outside the insulating layer and a polyvinyl chloride sheath extruded on the outer conductor ring, wherein the inner conductor core consists of a wire core formed by coaxially twisting a plurality of tinned copper wires and a first copper foil tape wrapped outside the wire core, and the first copper foil tape is formed by winding a layer of double-sided silvered copper foil tape;

the insulating layer consists of a first hard foam tape wound outside the first copper foil tape, a thermoplastic elastomer sleeve sleeved outside the first hard foam tape and a second hard foam tape wound outside the thermoplastic elastomer sleeve;

the outer conductor circle comprises the second copper foil area of wrapping in the second rigid foam outband, cup joints the copper mesh shielding layer in the second copper foil outband and winds the third copper foil area of wrapping outside the copper mesh shielding layer, and the spiral direction of second copper foil area and second rigid foam area is opposite.

Preferably, the second copper foil strip and the third copper foil strip are formed by winding double-sided silver-plated copper foil strips in a multi-layer mode, and the second copper foil strip and the third copper foil strip are respectively provided with 4-5 layers of copper foil strips; the winding overlapping rate of the double-sided silver-plated copper foil tapes of the first copper foil tape, the second copper foil tape and the third copper foil tape is 30-50%, the thickness of the double-sided silver-plated copper foil tape is 0.15-0.2mm, the thickness of the double-sided silver-plated layer is 10-30 mu m, and a compact conductor shield is formed in a double-sided silver-plated copper foil tape overlapping and wrapping mode and is thin.

The first copper foil belt is used as an inner shielding layer of the wire core, the purpose is to eliminate surface signal attenuation of the wire core when microwave signals are transmitted, in fact, the strongest signal attenuation of the coaxial cable is the surface of an inner conductor of the cable core, and the silver-plated copper foil is adopted, so that the surface conductivity is improved, the attenuation is reduced, and three dielectric layers with different conductivities are formed, so that signal wave dispersion and propagation are effectively prevented.

Preferably, the first rigid foam tape and the second rigid foam tape are respectively formed by wrapping porous polyurethane foam strips with the thickness of 5-8mm and the width of 10-12mm along the spiral direction, and form spiral grooves with the width of 10-12mm and rectangular cross sections. In actual preparation, foaming polyurethane foam is extruded to enable the cable core to spirally advance, after thermosetting, a first hard foam tape and a second hard foam tape which are relatively hard are formed, the first hard foam tape and the second hard foam tape with spiral grooves are adopted to improve the air content of the insulating layer, and the dielectric constant and the dissipation factor are both relatively small due to small density and containing a large amount of air media.

Preferably, the thermoplastic elastomer sleeve has a thickness of 40-50mm, which serves as insulation and isolation of the inner and outer conductors, while having superior flexibility to facilitate bending of the cable.

Preferably, the copper mesh shielding layer is a single-layer mesh structure formed by weaving copper wires with the diameter of 8mm, the weaving density of the copper mesh shielding layer is 30-50%, the copper mesh shielding layer is used as a framework supporting structure of the second copper foil strip and the third copper foil strip, and a large amount of air is contained in the copper mesh shielding layer, so that the dielectric constant and dissipation factor of signal dispersion are reduced under the condition that the bending of the cable is not influenced basically, and a double-interlayer shielding structure is formed.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model adopts the first copper foil strip as the conductor shielding layer of the conductive wire core, which is used for eliminating the attenuation of the surface of the conductor; the first hard foam strip and the second hard foam strip with the spiral grooves are adopted, and the thermoplastic elastomer sleeve is clamped between the first hard foam strip and the second hard foam strip, so that the formed insulating layer has the characteristics of high air content, low density, softness and flexibility, and the dielectric constant and dissipation factor in the microwave signal transmission process are greatly reduced; the copper mesh shielding layer is used as a framework supporting structure of the second copper foil strip and the third copper foil strip, a large amount of air is contained in the framework supporting structure, and the purpose is to form a double-interlayer shielding structure under the condition that the bending of the cable is basically not influenced, so that the dielectric constant and dissipation factor of signal dispersion are further reduced, and the shielding effect on external environment signals is improved.

Drawings

Fig. 1 is a schematic structural view of an ultra-low loss phase-stabilized microwave coaxial cable provided by the present invention;

fig. 2 is an exploded view of an internal structure of an ultra-low loss phase-stabilized microwave coaxial cable provided by the present invention;

in the figure: the cable comprises an inner conductor core 1, a cable core 101, a first copper foil strip 102, an insulating layer 2, a first hard foam strip 201, a thermoplastic elastomer sleeve 202, a second hard foam strip 203, a spiral groove 204, an outer conductor ring 3, a second copper foil strip 301, a copper mesh shielding layer 302, a third copper foil strip 303 and a polyvinyl chloride sheath 4.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-2, an ultra-low loss phase-stable microwave coaxial cable comprises an inner conductor core 1, an insulating layer 2 arranged outside the inner conductor core 1, an outer conductor ring 3 arranged outside the insulating layer 2, and a polyvinyl chloride sheath 4 extruded on the outer conductor ring 3, wherein the inner conductor core 1 is composed of a wire core 101 formed by coaxially twisting a plurality of tinned copper wires and a first copper foil tape 102 wrapped outside the wire core 101, and the first copper foil tape 102 is formed by winding a layer of double-sided silver-plated copper foil tape; the insulating layer 2 consists of a first hard foam tape 201 wound outside the first copper foil tape 102, a thermoplastic elastomer sleeve 202 sleeved outside the first hard foam tape 201 and a second hard foam tape 203 wound outside the thermoplastic elastomer sleeve 202; the outer conductor ring 3 is composed of a second copper foil tape 301 wrapped outside the second hard foam tape 203, a copper mesh shielding layer 302 sleeved outside the second copper foil tape 301, and a third copper foil tape 303 wrapped outside the copper mesh shielding layer 302, wherein the spiral directions of the second copper foil tape 301 and the second hard foam tape 203 are opposite.

Referring to fig. 1-2, the second copper foil strip 301 and the third copper foil strip 303 are formed by winding double-sided silver-plated copper foil strips in multiple layers, and the second copper foil strip 301 and the third copper foil strip 303 are respectively provided with 4-5 layers of copper foil strips; the winding overlapping rate of the double-sided silver-plated copper foil strips of the first copper foil strip 102, the second copper foil strip 301 and the third copper foil strip 303 is 30-50%, the thickness of the double-sided silver-plated copper foil strips is 0.15-0.2mm, the thickness of the double-sided silver-plated layers is 10-30 mu m, and a relatively compact conductor shield is formed in a double-sided silver-plated copper foil strip overlapping wrapping mode and is relatively thin.

The first copper foil tape 102 is used as an inner shielding layer of the core 101, and is used for eliminating surface signal attenuation of the core 101 when transmitting microwave signals, in fact, the strongest signal attenuation of the coaxial cable is the surface of the inner conductor of the cable core, and the silver-plated copper foil is adopted, so that the surface conductivity is improved, the attenuation is reduced, and three dielectric layers with different conductivities are formed, so that signal waves are effectively prevented from spreading and propagating.

Referring to fig. 1 to 2, a first rigid foam tape 201 and a second rigid foam tape 203 are respectively formed by wrapping a porous polyurethane foam strip with a thickness of 5 to 8mm and a width of 10 to 12mm in a spiral direction, and form a spiral groove 204 with a width of 10 to 12mm and a rectangular cross section. In actual preparation, foamed polyurethane foam is extruded to enable the cable core to spirally advance, after thermal curing, a first rigid foam tape 201 and a second rigid foam tape 203 which are relatively rigid are formed, the first rigid foam tape 201 and the second rigid foam tape 203 with the spiral grooves 204 are adopted to improve the air content of the insulating layer, and the dielectric constant and the dissipation factor are both large and small due to the fact that the density is small and a large amount of air media are contained.

Referring to fig. 1-2, the thermoplastic elastomer sleeve 202 has a thickness of 40-50mm, and functions to insulate and isolate the inner and outer conductors, while having superior flexibility to facilitate bending of the cable.

Referring to fig. 1-2, the copper mesh shielding layer 302 is a single-layer mesh structure formed by weaving copper wires with a diameter of 8mm, the weaving density of the copper mesh shielding layer 302 is 30-50%, the copper mesh shielding layer 302 is used as a framework supporting structure of the second copper foil strip 301 and the third copper foil strip 303, and contains a large amount of air, and the dielectric constant and dissipation factor of signal dispersion are reduced under the condition that the bending of the cable is not affected basically, so that a double-sandwich shielding structure is formed.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. An ultra-low loss phase-stable microwave coaxial cable comprises an inner conductor core (1), an insulating layer (2) arranged outside the inner conductor core (1), an outer conductor ring (3) arranged outside the insulating layer (2) and a polyvinyl chloride sheath (4) extruded on the outer conductor ring (3), and is characterized in that the inner conductor core (1) consists of a wire core (101) formed by coaxially twisting a plurality of tinned copper wires and a first copper foil tape (102) wrapped outside the wire core (101), and the first copper foil tape (102) is formed by winding a layer of double-sided silver-plated copper foil tape;

the insulating layer (2) is composed of a first hard foam tape (201) wound outside the first copper foil tape (102), a thermoplastic elastomer sleeve (202) sleeved outside the first hard foam tape (201), and a second hard foam tape (203) wound outside the thermoplastic elastomer sleeve (202);

outer conductor circle (3) are by around second copper foil tape (301) of package outside second hard foam area (203), cup joint copper mesh shielding layer (302) outside second copper foil tape (301) and around package third copper foil tape (303) outside copper mesh shielding layer (302) and constitute, the spiral opposite direction of second copper foil tape (301) and second hard foam area (203).

2. The ultra-low loss phase-stable microwave coaxial cable is characterized in that the second copper foil strip (301) and the third copper foil strip (303) are formed by winding double-sided silver-plated copper foil strips in a multi-layer mode, and the second copper foil strip (301) and the third copper foil strip (303) are respectively provided with 4-5 layers of copper foil strips;

the winding overlapping rate of the double-sided silver-plated copper foil tapes of the first copper foil tape (102), the second copper foil tape (301) and the third copper foil tape (303) is 30-50%, the thickness of the double-sided silver-plated copper foil tape is 0.15-0.2mm, and the thickness of the double-sided silver-plated copper foil tape is 10-30 mu m.

3. The ultra-low loss phase-stable microwave coaxial cable as claimed in claim 1, wherein the first rigid foam tape (201) and the second rigid foam tape (203) are respectively formed by wrapping a porous polyurethane foam strip with the thickness of 5-8mm and the width of 10-12mm along a spiral direction, and form a spiral groove (204) with the width of 10-12mm and a rectangular cross section.

4. An ultra-low loss phase-stable microwave coaxial cable according to claim 1, wherein the thermoplastic elastomer sleeve (202) has a thickness of 40-50 mm.

5. The ultra-low loss phase-stable microwave coaxial cable according to claim 1, wherein the copper mesh shielding layer (302) is a single-layer mesh structure woven by copper wires with the diameter of 8mm, and the weaving density of the copper mesh shielding layer (302) is 30-50%.