Radio frequency coaxial electric cable for mobile communication and method for manufacturing

Abstract

The invention relates to the improvement of a RF coaxial cable which is used for mobile communication. The invention is characterized in that the wall thickness of the inner conductor of a copper tube is 0.1-0.25mm, and the inner conductor of the copper tube has a filling supporting body. The cable of the invention not only can retain the electrical property of the coaxial cable of the original thick conductor, but also can greatly reduce the copper use amount of the inner conductor; the coaxial cable with the same specification can save 40-60% of copper used by the inner conductor, can make up the cost increase which is brought by the price rise of copper, and also reduces the cable weight; in addition, as the supporting body is increased in the inner conductor tube, the deficiency of lowered pressure resistance of the copper tube which is caused by the wall thickness decrease of the copper tube can be made up, and the mechanical property of cable is ensured. Take the 1 km 7 / 8'' cable for example, the copper consumption cost of the inner conductor can be reduced by RMB 4940, and the total cable weight is reduced to 422.5 kilograms from 471 kilograms. In addition, the wall thickness of the copper tube is reduced, so the inner conductor tube can be changed by copper belt longitudinal package welding molding, and the cost of the copper tube is further lowered. Besides, as the wall thickness of the inner conductor copper tube is reduced and a foaming supporting body is used, the softness of the cable is improved; taking the 7 / 8'' cable for an example, the bend radius once can be reduced about 40%.

Description

technical field [0001] The invention relates to the improvement of the radio frequency coaxial cable used for mobile communication, in particular to a radio frequency coaxial cable which can greatly reduce the amount of copper inner conductor and has low cost and its preparation method. Background technique [0002] Existing radio frequency coaxial cables for mobile communication, such as base station feeders, connecting jumpers and radio frequency coaxial cables for indoor mobile signal coverage wiring, such as CN2521719, CN2529357, CN2758949 and CN2517080 leakage coaxial cables applied by the applicant, its basic structure Such as figure 2 As shown, from the inside to the outside, it is composed of copper pipe inner conductor 4, foam insulation layer 3, copper pipe outer conductor 2 (smooth, wrinkled, with leakage holes, braided), and outer sheath 1. The inner conductor copper tube, one is to transmit signals, and the other is to serve as a foam insulation support, so it ...

AI Technical Summary

Problems solved by technology

Although it can save some copper, it will increase the weight of the cable, reduce the bending performance, and poor lateral compressive performance, especially for large-size cables, which is not only inconvenient for engineering construction, but also increases transportation and packaging costs. If it is excessively bent, it will affect the performance index of the cable and increase the transmission attenuation and voltage standing wave ratio

Therefore, it can only be used for RF coaxial cables with smaller wire diameter and lower transmission power, and still cannot replace RF coaxial cables with larger specifications and higher transmission power. Therefore, this solution is not suitable for large-scale RF coaxial cables. Adopted

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