Coaxial cable with high phase stability performance and preparation method thereof

Abstract

The invention relates to the field of communication cables, in particular to a coaxial cable with high phase stability performance and a preparation method thereof. The cable includes a coaxial center conductor, an insulating dielectric layer, an inner shielding layer, a first intermediate layer, a second intermediate layer, an outer shielding layer, and a sheath layer from the inside to the outside; the insulating dielectric layer is microporous PTFE Vinyl wrapping tape is wound outside the center conductor by wrapping process; the inner shielding layer is wound on the insulating medium layer by wrapping process; the first intermediate layer is polyether ether ketone film wrapped by wrapping process on the inner shielding layer; the second The middle layer is a solid PTFE film, and the second middle layer is wound on the first middle layer by wrapping process; the second middle layer is a sinter-resistant solid PTFE film, which is heated and softened after being wound on the first middle layer, and then cooled rapidly. The cable obtained by the present invention undergoes repeated bending, and the standing wave changes little, and the temperature and phase stability of the cable are relatively better, and the phase change after repeated cycles in a high and low temperature environment is not large.

Description

technical field [0001] The invention relates to the field of communication cables, in particular to a coaxial cable with high phase stability performance and a preparation method thereof. Background technique [0002] Coaxial cable refers to a cable with two concentric conductors, and the conductor and shield share the same axis. The most common coaxial cable consists of copper conductors separated by insulating material, on the outside of the inner insulating material is another layer of ring conductor and its insulator, and then the whole cable is covered by a sheath of PVC or Teflon material . Coaxial cables are widely used in all walks of life. In some fields, especially high-end fields, in addition to low attenuation and low VSWR, coaxial cables are also required to be caused by changes in temperature and mechanical stress. The variation of the cable phase shift constant is small. According to these requirements and the characteristics of function and structure, an i...

AI Technical Summary

Problems solved by technology

However, when the ambient temperature changes, the volume of PTFE will change greatly, which will lead to relatively large phase fluctuations of the cable. Therefore, in some environments with large temperature changes, it will cause signal transmission deviation or even problems, which cannot meet the requirements of radio frequency systems for stable coaxial cables.

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