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%.