CN211530157U - Ultralow-loss phase-stable microwave coaxial cable - Google Patents

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

An ultra-low loss phase stable microwave coaxial cable

technical field

The utility model relates to the technical field of coaxial cables, in particular to an ultra-low loss phase-stable microwave coaxial cable.

Background technique

Microwave coaxial cable has a wide range of applications in radar, communication, computer, precision instrumentation and medical testing, and is an indispensable component of radio communication systems and electronic equipment.

In recent years, as the signal attenuation test of the inner and outer conductors of coaxial cables has become more and more accurate, people have a deeper understanding of the signal transmission principle of coaxial cables, not only requiring microwave coaxial cables in the process of microwave signal transmission It has basic characteristics such as reliability, high bandwidth and high isolation, but also requires new characteristics such as low high frequency loss, stable phase, light weight and softness, which provides a big problem for cable developers.

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

Utility model content

The purpose of the utility model is to propose an ultra-low loss phase-stable microwave coaxial cable in order to solve the shortcomings in the prior art.

In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

An ultra-low loss phase-stable microwave coaxial cable, comprising 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, The conductor core is composed of a wire core formed by twisting multiple strands of tinned copper wires along the coaxial line and a first copper foil tape wrapped around the wire core. to make;

The insulating layer is composed of a first rigid foam tape wrapped around the first copper foil tape, a thermoplastic elastomer sleeve sleeved over the first rigid foam tape, and a second rigid foam tape wrapped around the thermoplastic elastomer sleeve;

The outer conductor ring is composed of a second copper foil tape wrapped around the second rigid foam tape, a copper mesh shielding layer sleeved outside the second copper foil tape, and a third copper foil tape wrapped around the copper mesh shielding layer. , the spiral direction of the second copper foil tape is opposite to that of the second rigid foam tape.

Preferably, both the second copper foil tape and the third copper foil tape are made of double-sided silver-coated copper foil tapes wound in multiple layers, and the second copper foil tape and the third copper foil tape respectively have 4-5 layers of copper foil Tape; the winding overlap rate of the double-sided silver-coated copper foil tapes of the first copper foil tape, the second copper foil tape and the third copper foil tape is specifically 30-50%, and the thickness of the double-sided silver-coated copper foil tape is 0.15- 0.2mm, the thickness of the silver-plated layer on both sides is 10-30μm, and the double-sided silver-plated copper foil tape is overlapped and wrapped to form a denser conductor shield, and the thickness is thinner.

The first copper foil tape is used as the inner shielding layer of the core, and its purpose is to eliminate the surface signal attenuation of the core when transmitting microwave signals. In fact, the strongest signal attenuation of the coaxial cable is on the surface of the inner conductor of the cable core. The silver-plated copper foil is used to improve the surface conductivity and reduce the attenuation on the one hand, and form three dielectric layers with different conductivity on the other hand, which can effectively prevent the signal wave from spreading and spreading.

Preferably, the first rigid foam strip and the second rigid foam strip are respectively made of porous polyurethane foam strips with a thickness of 5-8 mm and a width of 10-12 mm wrapped in a helical direction, and formed into a width of 10-12 mm and a cross-section of 10-12 mm. It is a helical groove with a rectangular structure. In actual preparation, foamed polyurethane foam is used to extrude the cable core to make the cable core spiral. The foam tape and the second rigid foam tape increase the air content of the insulating layer, and due to the low density and a large amount of air medium, the dielectric constant and dissipation factor are significantly smaller.

Preferably, the thickness of the thermoplastic elastomer sleeve is 40-50mm, which can insulate and isolate the inner and outer conductors, and at the same time has better flexibility, which is convenient for the bending of the cable.

Preferably, the copper mesh shielding layer is a single-layer mesh structure braided by copper wires with a diameter of 8 mm, the braiding density of the copper mesh shielding layer is 30-50%, and the copper mesh shielding layer serves as the second copper foil tape and the first The skeleton support structure of the three-copper foil tape contains a large amount of air, which is also to reduce the dielectric constant and dissipation factor of signal dispersion without affecting the bending of the cable, and form a double-layered shielding structure.

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

The utility model adopts the first copper foil tape as the conductor shielding layer of the conductive wire core to eliminate the attenuation of the conductor surface; the first hard foam tape and the second hard foam tape with spiral grooves are used and sandwiched between the two. With thermoplastic elastomer sleeve, the insulating layer formed has the characteristics of high air content, low density, softness and flexibility, which greatly reduces the dielectric constant and dissipation factor in the process of microwave signal transmission; the copper mesh shielding layer is used as the second copper The skeleton support structure of the foil tape and the third copper foil tape contains a lot of air, which is also to form a double sandwich shielding structure without affecting the cable bending, and further reduce the dielectric constant and dissipation factor of signal dispersion , and improve the shielding effect of external environmental signals.

Description of drawings

Fig. 1 is the structural representation of a kind of ultra-low loss phase stable microwave coaxial cable proposed by the utility model;

2 is an anatomical diagram of the internal structure of a kind of ultra-low loss phase-stable microwave coaxial cable proposed by the utility model;

In the figure: inner conductor core 1, wire core 101, first copper foil tape 102, insulating layer 2, first rigid foam tape 201, thermoplastic elastomer sleeve 202, second rigid foam tape 203, spiral groove 204, outer conductor Ring 3 , second copper foil tape 301 , copper mesh shielding layer 302 , third copper foil tape 303 , PVC sheath 4 .

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example.

1-2, an ultra-low loss phase stable microwave coaxial cable includes an inner conductor core 1, an insulating layer 2 arranged outside the inner conductor core 1, an outer conductor coil 3 arranged outside the insulating layer 2, and an extruded package. In the PVC sheath 4 of the outer conductor coil 3, the inner conductor core 1 is composed of a core 101 formed by twisting multiple tinned copper wires along the coaxial and a first copper foil tape 102 wrapped around the core 101. The first copper foil tape 102 is formed by winding one layer of double-sided silver-plated copper foil tape; outer thermoplastic elastomer sleeve 202 and a second rigid foam tape 203 wrapped around the thermoplastic elastomer sleeve 202; the outer conductor ring 3 is composed of a second copper foil tape 301, The copper mesh shielding layer 302 sleeved outside the second copper foil strip 301 and the third copper foil strip 303 wrapped around the copper mesh shielding layer 302 are formed. The spiral of the second copper foil strip 301 and the second rigid foam strip 203 In the opposite direction.

1-2, the second copper foil strip 301 and the third copper foil strip 303 are both made of double-sided silver-plated copper foil strips wound in multiple layers, and the second copper foil strip 301 and the third copper foil strip 303 are respectively There are 4-5 layers of copper foil tapes; the winding overlap 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 specifically 30-50%, and the double-sided The thickness of the silver-plated copper foil tape is 0.15-0.2mm, and the thickness of the silver-plated layer on both sides is 10-30 μm. The double-sided silver-plated copper foil tape is overlapped and wrapped to form a denser conductor shield, and the thickness is thinner. .

The first copper foil tape 102 is used as the inner shielding layer of the wire core 101, and its purpose is to eliminate the surface signal attenuation of the wire core 101 when transmitting microwave signals. In fact, the signal attenuation of the coaxial cable is the strongest in the inner conductor of the cable core. On the surface, silver-plated copper foil is used to improve surface conductivity and reduce attenuation on the one hand, and form three dielectric layers with different conductivity on the other hand, which can effectively prevent signal waves from spreading and spreading.

1-2, the first rigid foam strip 201 and the second rigid foam strip 203 are respectively made of porous polyurethane foam strips with a thickness of 5-8 mm and a width of 10-12 mm wrapped in a spiral direction, and formed with a width of 10 mm. - 12mm, helical groove 204 of rectangular configuration in cross section. In actual preparation, foamed polyurethane foam is used to extrude the cable core to make the cable core spirally precess. The first hard foam tape 201 and the second hard foam tape 203 increase the air content of the insulating layer, and due to the low density and a large amount of air medium, both the dielectric constant and the dissipation factor are significantly smaller.

1-2, the thickness of the thermoplastic elastomer sleeve 202 is 40-50mm, which can insulate and isolate the inner and outer conductors, and at the same time has better flexibility, which is convenient for the bending of the cable.

1-2, the copper mesh shielding layer 302 is a single-layer mesh structure woven by copper wires with a diameter of 8 mm. The weaving density of the copper mesh shielding layer 302 is 30-50%. The skeleton support structure of the second copper foil strip 301 and the third copper foil strip 303 contains a large amount of air, which is also to reduce the dielectric constant and dissipation factor of signal divergence without affecting the cable bending, and form a double interlayer shielding structure.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (5)

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%.

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