CN203056070U - Stable-phase low-loss radio-frequency coaxial cable - Google Patents

Abstract

The utility model belongs to the cable field, in particular relates to a stable-phase low-loss radio-frequency coaxial cable and solves a problem that conventional coaxial cables cannot simultaneously satisfy high temperature resistance, low transmission loss and good shielding performance. The cable comprises a silver-plated copper circular-wire or silver-plated copper twisted-wire internal conductor, a microporous polytetrafluoroethylene-film lapping insulating layer, a silver-plated copper-tape lapping external conductor, a silver-plated copper circular-wire braided shielding layer and a PFA sheath. The microporous polytetrafluoroethylene-film lapping insulating layer is mounted outside of the silver-plated copper circular-wire or silver-plated copper twisted-wire internal conductor. The silver-plated copper-tape lapping external conductor is mounted outside of the microporous polytetrafluoroethylene-film lapping insulating layer. The silver-plated copper circular-wire braided shielding layer is mounted outside of the silver-plated copper-tape lapping external conductor. The PFA sheath is mounted outside of the silver-plated copper circular-wire braided shielding layer. The radio-frequency coaxial cable provided by the utility model is suitable for transmission lines of various radio devices in communication, tracking, guard and radar navigation systems and connecting lines in electronic devices of radar and vector network analyzer.

Description

A kind of steady phase low-loss radio frequency coaxial-cable

Technical field

The utility model belongs to field of cables, specifically is a kind of steady phase low-loss radio frequency coaxial-cable.

Background technology

Coaxial cable is a kind of very important transmission medium, is widely used in the field of communication transmission.Radio frequency coaxial-cable has referred to two concentric conductors, and conductor and screen share the cable in same axle center.The RF coaxial cable insulation cable material is adopted radio frequency coaxial-cable series and is isolated copper conductors and form with the physics polyethylene of firing, and is that another layer ring shaped conductor is outer conductor in the outside of nexine insulating material, and outer conductor adopts copper strips moulding, welding, bundle line; Or adopt the aluminum pipe structure; Or the employing braiding structure, whole cable is encased by the sheath of pvc material then.

Growing along with communication, also more and more higher with the requirement of radio frequency coaxial-cable to signal transmission, both required its good transmission performance and mechanical performance, as stressed big, softness is good and tensile property is high, requires simple in structure, with low cost again.Therefore, how under the prerequisite that does not reduce the every electric property of radio frequency coaxial-cable, optimize product structure, reach high temperature resistant, loss is low, advantages of good shielding performance, becomes industry problem anxious to be solved.

Existing high temperature resistant radio frequency cable adds man-hour, and inner wire adopts common silver-coated copper wire, and insulating material adopts real core teflon insulation, and normal temperature is pushed form processing.Outer conductor adopts single braiding silver-coated copper wire, causes the cable frequency of utilization not high, and loss is big, the more important thing is in requiring the environment for use of phase stabilization, and phase place changes too greatly.

The utility model content

The purpose of this utility model is to provide a kind of steady phase low-loss radio frequency coaxial-cable, solves existing coaxial cable and can't satisfy high temperature resistant, problems such as loss is low, advantages of good shielding performance simultaneously.

The technical solution of the utility model is:

A kind of steady phase low-loss radio frequency coaxial-cable, this cable comprises: silver-plated copper round wire or copper stranded conductor inner wire, expanded microporous polytetra fluoroethylene-EPTEE film lapped insulation layer, the wrapped outer conductor of silver-plated copper strips, silver-plated copper round wire woven shield, PFA sheath, wherein:

The outside of silver-plated copper round wire or copper stranded conductor inner wire is expanded microporous polytetra fluoroethylene-EPTEE film lapped insulation layer, be the wrapped outer conductor of silver-plated copper strips in the outside of expanded microporous polytetra fluoroethylene-EPTEE film lapped insulation layer, being silver-plated copper round wire woven shield in the outside of the wrapped outer conductor of silver-plated copper strips, is the PFA sheath in the outside of silver-plated copper round wire woven shield.

The beneficial effects of the utility model are:

1, the utility model adopts silver-plated copper round wire or copper stranded conductor inner wire, can reduce sheet resistance, and oxidation resistance is strong, and signal attenuation is little, has improved the conductive capability of conductor on the whole.

2, the utility model adopts expanded microporous polytetra fluoroethylene-EPTEE film lapped insulation layer, by polyflon through bake, push, calendering, biaxial tension, thermal finalization and form a kind of microporous membrane, aperture 5.0 nanometers～1.0 millimeters, reduce the dielectric constant of dielectric, reduced the decay of cable.

3, the utility model adopts the wrapped outer conductor of silver-plated copper strips and silver-plated copper round wire woven shield, has advantages such as loss is little, shield effectiveness is better, bending property is better, both can satisfy the electric property of cable, can satisfy its bending property again.

4, the utility model adopts the PFA sheath, PFA is tetrafluoroethene-perfluorinated alkoxy vinyl ether copolymer, and tetrafluoroethene-perfluorinated alkoxy vinyl ether copolymer (PFA) has kept chemical temperatures, mechanical performance, electrical insulating property, self lubricity, non-viscosity, noninflammability and the resistance to ag(e)ing of the excellence of polytetrafluoroethylene (PTFE).Its outstanding feature is that melt viscosity is more much lower than PTFE, so the processing of available ordinary hot thermoplastic plastic method.Its goods high temperature stability performance is good, and about the high twice of high-temperature machinery strength ratio PTFE, and PFA is than PTFE softness, and folding quality is good, and resistance to cracking can be good.PFA almost can use all applications at PTFE, long-term serviceability temperature-80～260 ℃.Tetrafluoroethene-perfluorinated alkoxy vinyl ether copolymer (PFA) is processing easily, can adopt processing methods such as common molding, extrusion molding, injection moulding, and its processing temperature is 330 ℃～380 ℃.

Description of drawings

Fig. 1 is the utility model structural representation.

Among the figure, 1, silver-plated copper round wire or copper stranded conductor inner wire; 2, expanded microporous polytetra fluoroethylene-EPTEE film lapped insulation layer; 3, the wrapped outer conductor of silver-plated copper strips; 4, silver-plated copper round wire woven shield; 5, PFA sheath.

Embodiment

As shown in Figure 1, the steady phase low-loss of the utility model radio frequency coaxial-cable, mainly comprise: silver-plated copper round wire or copper stranded conductor inner wire 1, expanded microporous polytetra fluoroethylene-EPTEE film lapped insulation layer 2, the wrapped outer conductor 3 of silver-plated copper strips, silver-plated copper round wire woven shield 4, PFA sheath 5 etc., wherein:

The outside of silver-plated copper round wire or copper stranded conductor inner wire 1 is expanded microporous polytetra fluoroethylene-EPTEE film lapped insulation layer 2, be the wrapped outer conductor 3 of silver-plated copper strips in the outside of expanded microporous polytetra fluoroethylene-EPTEE film lapped insulation layer 2, being silver-plated copper round wire woven shield 4 in the outside of the wrapped outer conductor 3 of silver-plated copper strips, is PFA sheath 5 in the outside of silver-plated copper round wire woven shield 4.

The steady phase low-loss of the utility model radio frequency coaxial-cable has increased the structural stability of product, and when having guaranteed to change with machinery, phase of cable changes very little.Owing to vary with temperature, it is opposite that silver layer and expanded microporous polytetra fluoroethylene-EPTEE film change the phase place of cable, and this structure has been offset phase change rate to greatest extent, has improved the stability of phase of cable.The utility model is applicable to the transmission line of various wireless devices in the systems such as communication, tracking, warning, radar navigation, the connecting line in the electronic equipments such as radar, vector network analyzer.Be characterized in: frequency of utilization height, Gao Wenxiang, loss are low, good uniformity, softness, voltage standing wave ratio are low.

Claims (1)

1. steady phase low-loss radio frequency coaxial-cable, it is characterized in that, this cable comprises: silver-plated copper round wire or copper stranded conductor inner wire, expanded microporous polytetra fluoroethylene-EPTEE film lapped insulation layer, the wrapped outer conductor of silver-plated copper strips, silver-plated copper round wire woven shield, PFA sheath, wherein:

The outside of silver-plated copper round wire or copper stranded conductor inner wire is expanded microporous polytetra fluoroethylene-EPTEE film lapped insulation layer, be the wrapped outer conductor of silver-plated copper strips in the outside of expanded microporous polytetra fluoroethylene-EPTEE film lapped insulation layer, being silver-plated copper round wire woven shield in the outside of the wrapped outer conductor of silver-plated copper strips, is the PFA sheath in the outside of silver-plated copper round wire woven shield.

Images