CN2385411Y

CN2385411Y - Leakage coaxial cable

Info

Publication number: CN2385411Y
Application number: CN 99204674
Authority: CN
Inventors: 董方; 赵金林
Original assignee: DONGYUAN INDUSTRIAL Co TIANJIN ECONOMIC TECHNOLOGY DEVELOPMENT ZONE
Priority date: 1999-02-12
Filing date: 1999-02-12
Publication date: 2000-06-28
Anticipated expiration: 2009-02-12

Abstract

The utility model relates to a leakage coaxial cable which is composed of an inner conductor, an insulation layer, an outer conductor, a polyester film, an inner sheath and an outer sheath. The insulation layer is a polyethylene insulation layer which can realize the integral physical foaming. The utility model has the advantages that the technology is simplified when the leakage coaxial cable with new structure is produced and processed, so the performance index of the product is greatly raised; the dielectric coefficient of a cable is small because the physical foaming degree is very high, so the cable attenuation is very small; foaming holes of the physical foaming is very homogeneous and tight, so the voltage standing-wave ratio of the cable is very small.

Description

Leaky coaxial cable

The utility model belongs to communication cable, particularly a kind of leaky coaxial cable.

At present, development along with communication career, underground communication career also obtains fast development, leaky coaxial cable is widely used in the mobile communication system of colliery, tunnel, tunnel, underground railway and other foundation, and wired place that is difficult to adapt to communicates by letter with dual-use function wireless can not the transmission of realization of its transmission line and antenna.The dielectric coefficient of the leaky coaxial cable of polyethylene rope pipe insulation is big at present, so the decay of cable is very big, and simultaneously, the voltage standing wave ratio of cable is also very big.Its structure causes water resistance poor, moisture-sensitive.And processing is because of taking winding process, complex process, cost height.

The purpose of this utility model provides a kind of leaky coaxial cable, and the dielectric coefficient of leaky coaxial cable that overcomes above-mentioned polyethylene rope pipe insulation is big, and it is very big to decay, voltage standing wave(VSW) is big, water resistance is poor, and moisture-sensitive is twined processing technology complexity, the shortcoming and defect that cost is high.

The purpose of this utility model is achieved in that

A kind of leaky coaxial cable is made up of inner wire, insulating barrier, outer conductor, mylar, inner sheath and oversheath, it is characterized in that: insulating barrier is whole physically foamed pe insulation layer.

Inner sheath adopts the inner sheath of black polyethylene, and oversheath adopts yellow polyethylene oversheath.

The utility model has the advantages that:

Leaky coaxial cable product reduction of process in production and processing of new structure, all be improved largely on the product performance index, because the physical blowing degree is very high, make the dielectric coefficient of cable very little, therefore the decay of cable is very little, abscess owing to physical blowing is very evenly fine and closely woven simultaneously, so the voltage standing wave ratio of cable is also very little, sees following processing performance contrast table for details.

Decay	SLYWV \| 75 \| 10	30MHZ≤1.8dB/100m 85MHZ≤3.1dB/100m 150MHZ≤4.15dB/100m 160MHZ≤4.3db/100m	30MHZ≤1.85dB/100m 85MHZ≤3.2dB/100m 150MHZ≤4.4db/100m
	SLYWV \| 75 \| 10		30MHZ≤1.85dB/100m 85MHZ≤3.2dB/100m 150MHZ≤4.4db/100m	SLYWV \| 50 \| 10	30MHZ≤1.98dB/100m 85MHZ≤3.62dB/100m 150MHZ≤5.16dB/100m	30MHZ≤2.0dB/100m 85MHZ≤3.6dB/100m 150MHZ≤5.2dB/100m
	The insulation system of working service cable has guaranteed that moisture can not enter the inner non-maintaining use of cable			SLYWV \| 50 \| 10	30MHZ≤1.98dB/100m 85MHZ≤3.62dB/100m 150MHZ≤5.16dB/100m	30MHZ≤2.0dB/100m 85MHZ≤3.6dB/100m 150MHZ≤5.2dB/100m	In use moisture can be easy to enter in the insulated tube, cause the decay index to descend significantly, even influence the normal operation of system.

Below in conjunction with description of drawings embodiment:

Fig. 1 is the leaky coaxial cable cutaway view of present patent application

Fig. 2 is the leaky coaxial cable cutaway view of polyethylene rope pipe insulation structure

Among Fig. 1: the yellow polyethylene oversheath of 1-inner wire 2-physically foamed pe insulation 3-outer conductor 4-mylar 5-black polyethylene inner sheath 6-

Fig. 2 is in the leaky coaxial cable of polyethylene rope pipe insulation structure of original old product: the yellow polyethylene oversheath of 7-inner wire 8-polyethylene foamed rope 9-polyethylene pipe 10-outer conductor 11-mylar 12-black polyethylene inner sheath 13-

A kind of leaky coaxial cable is made up of inner wire 1, insulating barrier 2, outer conductor 3, mylar 4, inner sheath 5 and oversheath 6, and insulating barrier is whole physically foamed pe insulation layer.Inner sheath adopts the inner sheath of black polyethylene, and oversheath adopts yellow polyethylene oversheath.

Both differences are the difference of insulation system, and novel product is a physically foamed pe insulation, and old product is the polyethylene rope pipe insulation.

Claims

1, a kind of leaky coaxial cable is made up of inner wire, insulating barrier, outer conductor, mylar, inner sheath and oversheath, it is characterized in that: insulating barrier is whole physically foamed pe insulation layer.

2, leaky coaxial cable according to claim 1 is characterized in that: inner sheath adopts the inner sheath of black polyethylene, and oversheath adopts yellow polyethylene oversheath.