CN209607461U - A kind of coaxial cable - Google Patents

Abstract

The utility model discloses a kind of coaxial cables, belong to field of cable technology.It from the inside to the outside include conductor core wire (1), insulating layer (2), outer conductor shielded layer, sheath (5), woven shield (6) and sheath outer layer (7), the insulating layer (2) forms using micropore PTFE is wrapped；The conductor core wire (1) uses single silver-coated copper wire, and diameter is less than 2.5mm, and silver thickness is not less than 1.5 μm；The outer conductor shielded layer is formed by silver-plated copper strips lapping layer (3) and silver-gilt copper wire wrapping layer (4) from the inside to the outside；For the thickness of the silver-plated copper band less than 100 μm, silver thickness is not less than 2.0 μm；The sheath (5) is formed by polyimide composite film band is wrapped；The woven shield (6) is woven by silver-plated circular copper wire, and count is greater than 95%.This coaxially has many advantages, such as low-loss, high stable and has compared with high-flexibility.

Description

A kind of coaxial cable

Technical field

The utility model belongs to field of cable technology, in particular to a kind of coaxial cable.

Background technique

Cable has power cable, control cable, compensating cable, shielded cable, high-temperature cable, computer cable, signal electricity Cable, coaxial cable, fire-resisting cable, cable for ship, mine cable and aluminium alloy cable etc..They are all by sub-thread or stranded conductor It is formed with insulating layer, for connecting circuit, electric appliance etc..Since cable needs to be bent, wind etc. in use, it is desirable that cable On the basis of meeting cable basic performance, it is also necessary to pliability with higher.

With electronics, the development of the communication technology, early warning plane phased-array radar, mobile base station, satellite and guided missile monitoring with And the continuous improvement of the weapon system-of-systems technology such as other digital phase sensitive electronic systems, to radio frequency low-loss thin coaxial cable Outer diameter, transmission loss and weight are put forward new requirements, this just caused people to how reduce outer diameter, weight and transmission damage Consume small and material research.

But in the prior art, low-loss is difficult to take into account with higher pliability；Present embodiments provide a kind of low-loss, High stable and there is coaxial cable compared with high-flexibility.

Summary of the invention

The utility model embodiment provides a kind of coaxial cable, has low-loss, high stable and has compared with high-flexibility etc. Advantage.The technical solution is as follows:

The utility model embodiment provides a kind of coaxial cable, includes from the inside to the outside conductor core wire 1, insulating layer 2, leads outside Body shielded layer, sheath 5, woven shield 6 and sheath outer layer 7, the insulating layer 2 are formed using micropore PTFE is wrapped；It is described Conductor core wire 1 uses single silver-coated copper wire, and diameter is less than 2.5mm, and silver thickness is not less than 1.5 μm；The outer conductor screen Layer is covered to be formed by silver-plated copper strips lapping layer 3 and silver-gilt copper wire wrapping layer 4 from the inside to the outside；The thickness of silver-plated copper band less than 100 μm, Silver thickness is not less than 2.0 μm；The sheath 5 is formed by polyimide composite film band is wrapped；The woven shield 6 by Silver-plated circular copper wire weaves, and count is greater than 95%.

Wherein, the sheath outer layer 7 in the utility model embodiment is extruded in outside woven shield 6 for FEP and forms.

Wherein, the size of the silver-plated copper band in the utility model embodiment is 70-85 μm of * 3.5-4.0mm.

Wherein, the diameter of the conductor core wire 1 in the utility model embodiment is 2.35-2.45mm, the thickness of the insulating layer 2 Degree be 2.0-2.1mm, the outer conductor shielded layer with a thickness of 0.3-0.4mm, the sheath 5, woven shield 6 and sheath The overall thickness of outer layer 7 is 0.15-0.2mm.

Technical solution provided by the embodiment of the utility model has the benefit that the utility model embodiment provides A kind of coaxial cable has many advantages, such as low-loss, high stable and has compared with high-flexibility.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of coaxial cable provided by the embodiment of the utility model.

In figure: 1 conductor core wire, 2 insulating layers, 3 silver-plated copper strips lapping layers, 4 silver-gilt copper wire wrapping layers, 5 sheaths, 6 braidings Shielded layer, 7 sheath outer layers.

Specific embodiment

It is practical new to this below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer Type is described in further detail.

Referring to Fig. 1, the utility model embodiment provides a kind of coaxial cable, from the inside to the outside includes the conductor set gradually Core wire 1, insulating layer 2, outer conductor shielded layer, sheath 5, woven shield 6 and sheath outer layer 7 etc..Wherein, insulating layer 2 uses Micropore PTFE(polytetrafluoroethylene (PTFE)) it wrapped forms；Micropore PTFE has preferable stability in wide temperature range, and has Lesser dielectric constant；Simultaneously by wrapped form, the disadvantage of processing technology complexity had both been overcome, has also had product preferable Stability and flexibility.Conductor core wire 1 uses single silver-coated copper wire, and diameter is less than 2.5mm, and silver thickness is not less than 1.5μm；Conductor core wire 1 under normal circumstances using single or more be twisted two kinds of forms, single conductor it is specific be it is easy to process, Decay less, but flexibility and vibration resistance are poor；The characteristics of more conductors is better softness, and the larger and steady phase that decays Property is bad.It has been found that if by the diameter control of conductor in 2.5mm(especially in 2.2-2.5mm) below when, Ji Nengbao Card has lower decaying, and has preferable flexibility.Outer conductor shielded layer is from the inside to the outside successively by silver-plated copper strips lapping layer 3 (being formed by silver-plated copper band is wrapped) and silver-gilt copper wire wrapping layer 4 form, and play dual parts of to form outer conductor circuit and shielding；Plating Silver-bearing copper band is wrapped to have many advantages, such as that resistance is low, shield effectiveness is good, decaying is small, but flexibility is poor, allows bending radius big；Silver-plated copper Filament winding has preferable flexibility.Wherein, the thickness of silver-plated copper band (increases while guaranteeing shield effectiveness soft less than 100 μm It is soft), not less than 2.0 μm of silver thickness (guaranteeing shield effectiveness).It is close to it absolutely using Ultrathin copper strip is wrapped in this patent Edge layer, silver-gilt copper wire is wrapped again for outside is fastened, and makes whole to be integrally formed, to guarantee it with preferable flexibility and steady It is qualitative.Sheath 5 is formed by polyimide composite film band is wrapped, is had the function of preferably being isolated and be protected, and flexibility Preferably.Woven shield 6 is woven by silver-plated circular copper wire, and count is greater than 95%；Although it has biggish decaying, But it keeps product more stable with easy to process, good product consistency, formed with outer conductor shielded layer it is complementary, it is main to rise Shielding action.

Wherein, the sheath outer layer 7 in the utility model embodiment is FEP(perfluoroethylene-propylene) it is extruded in woven shield It is formed outside 6, with preferable property at high and low temperature, higher mechanical strength, preferable corrosion resistance, high flame retardant, to cable With good protective action.

Wherein, the size of the silver-plated copper band in the utility model embodiment is 70-85 μm of (thickness) * 3.5-4.0mm(wide Degree), it is specifically as follows 0.075mm*3.8mm.

Wherein, the diameter of the conductor core wire 1 in the utility model embodiment be 2.35-2.45mm, insulating layer 2 with a thickness of 2.0-2.1mm, outer conductor shielded layer with a thickness of 0.3-0.4mm, the total thickness of sheath 5, woven shield 6 and sheath outer layer 7 Degree is 0.15-0.2mm, and the outside diameter of cable is in 7.35-7.7mm.

Through detecting, the index of this cable is as shown in table 1:

Table 1

Project	Testing conditions	Detection data
			Cable weight (g/m)		125-133
The outside diameter of cable (mm)		7.5-7.65
			Insulation resistance (M Ω * km)		≥22500
Characteristic impedance (Ω)		49.5±0.5
			Mutual capacitance (pF/m)		75.4-76.6
Decaying		1GHz≤0.152dB/m； 10GHz≤0.45dB/m； 18GHz≤0.63dB/m
			Reflection loss	In 0.05-2GHz	27.2-28.2dB
Standing-wave ratio	In 0.05-2GHz	1.05-1.08
			Capacitor stability	150 DEG C, -55 DEG C of hot and cold alternations	3.3%-3.45%
Phase stability	In -55 DEG C -71 DEG C	Temperature phase stability 437ppm；2.4 ° of phase stability of bending
			Shielding attenuation	1GHz	121bB
Low-temperature bending	- 45 DEG C, 2h, 7 times of outer diameters of bending radius	Surface flawless does not crack
			Hot bending	80 DEG C, 168h, 7 times of outer diameters of bending radius	Surface flawless does not crack

As can be seen from the above table, the steady Xiang Zhibiao of this cable, low decay indices etc. can reach the index of same kind of products at abroad, And lighter weight, diameter is smaller, has good flexibility.

The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model Within the scope of shield.

Claims (4)

1. a kind of coaxial cable includes conductor core wire (1), insulating layer (2), outer conductor shielded layer and sheath outer layer from the inside to the outside (7), the insulating layer (2) forms using micropore PTFE is wrapped；It is characterized in that, further including being set to outer conductor from the inside to the outside to shield Sheath (5) and woven shield (6) between layer and sheath outer layer (7)；The conductor core wire (1) uses single silver-plated copper Line, diameter are less than 2.5mm, and silver thickness is not less than 1.5 μm；The outer conductor shielded layer from the inside to the outside by silver-plated copper band around Covering (3) and silver-gilt copper wire wrapping layer (4) form；For the thickness of silver-plated copper band less than 100 μm, silver thickness is not less than 2.0 μm； The sheath (5) is formed by polyimide composite film band is wrapped；The woven shield (6) woven by silver-plated circular copper wire and At count is greater than 95%.

2. coaxial cable according to claim 1, which is characterized in that the sheath outer layer (7) is that FEP is extruded in braiding screen Layer (6) is covered to form outside.

3. coaxial cable according to claim 1, which is characterized in that the size of the silver-plated copper band is 70-85 μm of * 3.5- 4.0mm。

4. coaxial cable according to claim 1, which is characterized in that the diameter of the conductor core wire (1) is 2.35- 2.45mm, the insulating layer (2) with a thickness of 2.0-2.1mm, the outer conductor shielded layer with a thickness of 0.3-0.4mm, it is described The overall thickness of sheath (5), woven shield (6) and sheath outer layer (7) is 0.15-0.2mm.