CN212847858U - Radio frequency coaxial cable of mixed type insulating medium - Google Patents

Abstract

The utility model discloses a radio frequency coaxial cable of mixed type insulating medium belongs to cable technical field. The method is used for solving the problems that a high-performance low-loss stable-phase radio frequency coaxial cable adopting a wrapping structure has poor adhesive force, and insertion loss stability and mechanical phase stability are poor after the cable is bent for many times. The cable comprises an inner conductor, a first insulating layer, a second insulating layer, an outer conductor layer and a sheath layer which are coaxially arranged from inside to outside in sequence; the first insulating layer is formed by extruding and stretching a polytetrafluoroethylene material through a solid core; the second insulating layer is formed by wrapping a low-density polytetrafluoroethylene thin film.

Description

Radio frequency coaxial cable of mixed type insulating medium

Technical Field

The utility model belongs to the technical field of the cable, more specifically relate to a radio frequency coaxial cable of insulating medium of mixed type.

Background

The high-performance low-loss phase-stable radio frequency coaxial cable is widely applied to high-end weaponry, satellite communication equipment, radar navigation and the like internationally, particularly radio frequency coaxial cable products used by phased array radar and other systems, the low-loss phase-stable radio frequency coaxial cable is required to be used for ensuring the normal conduction of radio frequency signals, and the low-loss phase-stable radio frequency coaxial cable is an essential key component in aviation, aerospace and new-generation weaponry.

The insulating medium layer of the existing radio frequency coaxial cable is manufactured into a solid pushing structure, a raw material stretching structure and a wrapping structure, the transmission rate of the cable with the solid pushing structure is basically about 69%, the loss is large, the phase is unstable, the cable loss of the raw material stretching structure is reduced by 30% compared with that of the solid pushing structure, the transmission rate reaches 77%, the phase stability performance is poor, the cable loss of the low-density polytetrafluoroethylene tape wrapping structure is low, the transmission rate reaches more than 80%, the dielectric constant is small, the use frequency is high, and the phase stability performance is good. However, because the insulation adopts a wrapping structure, the impedance consistency is difficult to control, and the standing-wave ratio is easy to generate resonance points; the adhesive force of the insulating layer of the cable relative to the inner conductor is small, the adhesive force of the cable with small wire diameter is basically about 2N-3N, and loss stability and mechanical phase stability of the cable after the cable is bent for many times are directly caused.

In conclusion, the high-performance low-loss stable-phase radio frequency coaxial cable adopting the wrapping structure has the problems of poor adhesion, poor insertion loss stability and poor mechanical phase stability after being bent for many times.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a mixed type insulating medium's radio frequency coaxial cable for there is the adhesive force poor in the solution to adopt the low steady phase radio frequency coaxial cable that decreases of high performance around the package structure, after the bending many times, leads to inserting to decrease the poor problem of poor stability and mechanical phase stability.

The embodiment of the utility model provides a mixed type insulating medium radio frequency coaxial cable, which comprises an inner conductor, a first insulating layer, a second insulating layer, an outer conductor layer and a sheath layer which are coaxially arranged from inside to outside;

the first insulating layer is formed by extruding and stretching a polytetrafluoroethylene material through a solid core;

the second insulating layer is formed by wrapping a low-density polytetrafluoroethylene thin film.

Preferably, the material of the inner conductor is silver-plated oxygen-free copper.

Preferably, the outer conductor layer comprises a first outer conductor layer and a second outer conductor layer from inside to outside;

the first outer conductor layer is formed by wrapping a silver-plated copper strip;

the second outer conductor layer is formed by weaving silver-plated copper wires.

Preferably, the constituent material of the sheath is a fluoroethylene propylene copolymer.

Preferably, the first insulating layer has a single wall thickness of less than 0.35 mm.

Preferably, the outer diameter of the cable is less than φ 3.

The embodiment of the utility model provides a mixed type insulating medium's radio frequency coaxial cable, including inner conductor, first insulating layer, second insulating layer, outer conductor layer and the restrictive coating that from inside to outside coaxial arrangement in proper order; the first insulating layer is formed by extruding and stretching a polytetrafluoroethylene material through a solid core; the second insulating layer is formed by wrapping a low-density polytetrafluoroethylene thin film. A first insulating layer is formed in a pushing mode, the second insulating layers of other layers are wound in opposite directions, the cable formed in the pushing mode on the first insulating layer is large in adhesive force, the second insulating layers of other layers are wound in opposite directions, the adhesive force between the insulating layers and the inner conductor is greatly increased, the problem that insertion loss stability and mechanical phase stability are poor after the wound cable is bent for many times is solved, the pushing structure on the inner layer effectively controls the consistency of the outer diameter of the insulation, the impedance consistency is also solved, and the standing-wave ratio is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a radio frequency coaxial cable of a hybrid insulating medium according to an embodiment of the present invention;

wherein 1-inner conductor, 2, first insulating layer, 3-second insulating layer, 4-first outer conductor layer, 5-second outer conductor layer, 6-jacket.

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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 1 schematically illustrates a structure of a radio frequency coaxial cable with a hybrid insulating medium according to an embodiment of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a radio frequency coaxial cable with a hybrid insulating medium, which includes an inner conductor 1, a first insulating layer 2, a second insulating layer 3, an outer conductor layer and a sheath 6, which are coaxially disposed from inside to outside.

In the prior art, a common push-extrusion cable is characterized by large adhesive force, small transmission rate, large loss and instability; the high-performance wrapped cable has the advantages that the insulating layer adopts a multi-layer polytetrafluoroethylene material belt wrapping structure, so that the transmission rate is high, and the loss is small; however, the cable has poor adhesion, which results in poor stability of the cable and poor width-phase consistency after multiple bending.

In order to solve the above problem, an embodiment of the present invention provides a cable, which adopts a hybrid insulation structure, as shown in fig. 1, wherein the insulation layer includes a first insulation layer 2 and a second insulation layer 3. In practical application, because the solid core pushes away the adhesive force big, and dielectric constant is big, and the tensile dielectric constant of raw material is between the solid core pushes away and around the package, but the adhesive force is poor so in the embodiment of the utility model, first insulation layer 2 adopts to push half sintering, and first insulation layer 2 is pushed by the solid core by polytetrafluoroethylene material and is stretched to form promptly, and this component mode has both increased the adhesive force between inner conductor 1 and first insulation layer 2, has reduced dielectric constant again.

The constitution material of second insulating layer 3 is low density polytetrafluoroethylene rarefied film, and it adopts the multilayer to wrap the package, and adopts the form of reverse package between the layer, adopts above-mentioned structure, and first insulating layer 2 makes the adhesive force of cable great owing to pushing and crowding the shaping, and multilayer second insulating layer 3 adopts the structure of reverse package, greatly increased insulating layer and inner conductor 1's adhesive force, has solved the problem of inserting damage stability and mechanical phase stability variation after the package cable is crooked many times. And adopt above-mentioned structure between first insulating layer 2 and the second insulating layer 3 in this cable, had both had the advantage of crowded type cable and around package type cable, had the characteristics that the loss is low, and the stationary phase performance is good to this cable after the bending many times, it still has the advantage that amplitude and phase stability is good and the uniformity is good.

Specifically, the embodiment of the utility model provides an in, the single wall thickness of first insulating layer 2 is less than 0.35mm, in practical application, can be according to specifically requiring, confirms the number of piles of the reverse package of second insulating layer 3, and second insulating layer 3 adopts the thin membrane of low density polytetrafluoroethylene reverse package promptly, up to the completion around the requirement external diameter of package insulation.

Further, as shown in fig. 1, the inner conductor 1 included in the cable according to the embodiment of the present invention may be made of silver-plated oxygen-free copper.

Further, the embodiment of the utility model provides an outer conductor that cable includes has interior to including first outer conductor layer 4 and second outer conductor layer 5 outward, and first outer conductor layer 4 is formed for the silver-plated copper strips around the package, and second outer conductor layer 5 is woven for the silver-plated copper line and is formed. Namely, the outer conductor layer adopts a structure of silver-plated copper strip spiral lapping and round wire weaving.

The embodiment of the utility model provides a constituent material of sheath 6 of cable is fluoroethylene propylene copolymer.

In practical application, the embodiment of the utility model provides a cable, its adhesion force is greater than the conventional 3N about around the package cable about, in an example, about only 2N ~ 3N around the thin cable adhesion force of package type is wrapped to below □ 3 insulating layer, and the embodiment of the utility model provides a cable's adhesion force can reach about 6N ~ 7N.

To sum up, the embodiment of the present invention provides a hybrid insulating medium rf coaxial cable, which includes an inner conductor, a first insulating layer, a second insulating layer, an outer conductor layer and a sheath layer coaxially disposed from inside to outside; the first insulating layer is formed by extruding and stretching a polytetrafluoroethylene material through a solid core; the second insulating layer is formed by wrapping a low-density polytetrafluoroethylene thin film. A first insulating layer is formed in a pushing mode, the second insulating layers of other layers are wound in opposite directions, the cable formed in the pushing mode on the first insulating layer is large in adhesive force, the second insulating layers of other layers are wound in opposite directions, the adhesive force between the insulating layers and the inner conductor is greatly increased, the problem that insertion loss stability and mechanical phase stability are poor after the wound cable is bent for many times is solved, the pushing structure on the inner layer effectively controls the consistency of the outer diameter of the insulation, the impedance consistency is also solved, and the standing-wave ratio is reduced.

While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (6)

1. A mixed type insulating medium radio frequency coaxial cable is characterized by comprising an inner conductor, a first insulating layer, a second insulating layer, an outer conductor layer and a sheath layer which are coaxially arranged from inside to outside in sequence;

the first insulating layer is formed by extruding and stretching a polytetrafluoroethylene material through a solid core;

the second insulating layer is formed by wrapping a low-density polytetrafluoroethylene thin film.

2. The cable of claim 1 wherein the material of the inner conductor is silver plated oxygen free copper.

3. The cable of claim 1, wherein the outer conductor layer comprises, from inside to outside, a first outer conductor layer and a second outer conductor layer;

the first outer conductor layer is formed by wrapping a silver-plated copper strip;

the second outer conductor layer is formed by weaving silver-plated copper wires.

4. The cable of claim 1 wherein the jacket comprises a fluoroethylene propylene copolymer.

5. The cable of claim 1 wherein the first insulating layer has a single wall thickness of less than 0.35 mm.

6. The cable of claim 1, wherein the cable has an outer diameter less than Φ 3.

Images