Corrogated pipe outer conductor leakage radio-frequency coaxial cable for mobile communication
A radio frequency coaxial cable and mobile communication technology, applied in the direction of coaxial cable/analog cable, waveguide, circuit, etc., can solve the problem of cable transmission attenuation and increase of coupling loss, leakage of radio frequency coaxial cable outer conductor, increase of outer conductor cost, etc. problems, to achieve the effect of ensuring transmission attenuation, saving transportation costs, and improving cost performance
Inactive Publication Date: 2010-12-08
JIANGSU HENGXIN TECH CO LTD
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Problems solved by technology
With the shortage of copper resources, the price of copper has soared, and the price of copper has risen from 45 yuan / kg to 60 yuan / kg, resulting in a substantial increase in cable costs and a sharp decline in economy. Taking a 1 km 7 / 8″ cable as an example, the outer conductor Consumes 177 kg of copper (thickness 0.23mm), and increases the cost of the outer conductor by 2655 yuan
As an electrical conductor, aluminum is much cheaper than copper (the current market price is 28 yuan / kg), but because the resistivity is higher than that of copper, it will lead to increased cable transmission attenuation and coupling loss. After testing: 7 / 8″ cable 900MHz Increase the attenuation by about 0.3db / 100m, and increase the coupling loss by 5db
Therefore, it has not been used so far for the outer conductor of the leaky RF coaxial cable
Method used
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[0017] Example: see figure 2 , the 7 / 8" leaky radio frequency coaxial cable 1 of the present invention, including a φ9,0mm smooth copper tube inner conductor, a foamed polyethylene insulator with a thickness of 6.75mm, and a longitudinal aluminum strip with a thickness of 0.35mm, welded with argon and helium protection, Rolled annular corrugation with V-shaped groove 4, continuous oval single row of holes 3 at the peak of the outer conductor, PE or flame-retardant polyolefin outer sheath. The pitch of the outer conductor of the cable is 7.0mm, and the outer diameter of the trough is 21.9mm. The outer diameter of the peak is 24.9mm, and the insulating layer is made of CO alone. 2 Foaming, fully closed cell foaming degree 83.5%, cell structure see Figure 4 . The obtained cable has been measured: 900MHz attenuation is 3.9db / 100m, coupling loss is 80db, and the minimum single bending radius is 80mm.
[0018] The cable insulator is composed of: 69wt% high-density polyethylene,...
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Abstract
A corrugated tube external conductor type of leakage radio frequency coaxial cable used on mobile communication is prepared as applying CO2 physical-foaming to foam insulation body to make said insulation body have sealed air bubble foaming ratio of 82.5-84%, using aluminum conductor rolled on with V form ring grooves as corrugated external conductor with corrugation depth being 0.15-0.40mm less than that of copper external conductor in the same specification.
Description
technical field [0001] The invention relates to the improvement of the leaky radio frequency coaxial cable with corrugated copper tube outer conductor for mobile communication, in particular to a low-cost aluminum annular corrugated outer conductor leaky radio frequency coaxial cable. Background technique [0002] Leaky radio frequency coaxial cable, because the outer conductor has a slot, has both axial transmission and radial radiation functions for mobile signals, that is, it has dual functions of high-frequency signal transmission line and antenna, and is used in elevator shafts, tunnels, underground Mobile signal blind areas such as parking lots to achieve seamless coverage of mobile signals. Its structure is basically the same as the coaxial cable ( figure 1 ), consisting of an inner conductor, N with a maximum foaming degree of 82% 2 Foam insulation, U-shaped groove, 2 ring-shaped copper tube outer conductors, and a sheath. The difference is that an oval slot of a c...
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IPC IPC(8): H01B11/18C08J9/12H01P3/06
Inventor 刘中华丁伟林来林坡袁雪钢冯玲芳
Owner JIANGSU HENGXIN TECH CO LTD