Low-noise and stable-phase coaxial cable

Abstract

The invention discloses a low-noise and stable-phase coaxial cable. The low-noise and stable-phase coaxial cable comprises a cable core and a shielding attenuation layer, wherein the cable core comprises an internal conductor, a semiconductor layer and a combination insulation layer, the semiconductor layer wraps the internal conductor, the combination insulation layer wraps the semiconductor layer, the shielding attenuation layer wraps the cable core and is sequentially provided with the semiconductor layer, a wrapping silver-plating flat copper belt and a weaving silver-plating flat wire from inside to outside, a sheath is arranged outside the shielding attenuation layer in an extrusion manner, the semiconductor layer comprises a matrix, a graphite powder layer and a conductive polymer layer, the graphite powder layer is coated on a surface of the matrix, the conductive polymer layer is coated outside the graphite powder layer, and the combination insulation layer is dual insulationlayers wrapped by an inner layer of low-concentration micropore polytetrafluoroethylene thin film and wrapped by a polyimide thin film. Conductive polymer is impregnated with graphite and is used as the semiconductor layer, three layers of shielding attenuation is formed from the conductive polymer and a copper wire, the electromagnetic interference is gradually offset by a mode that the shieldingresistance is gradually improved from inside to outside, the attenuation and the noise of the cable are greatly reduced, and a noise value is 0.1mV or below.

Description

technical field [0001] The invention relates to the technical field of communication cables, in particular to a low-noise stable coaxial cable. Background technique [0002] Today's measurement and control technology has reached a high level. The number of detectable signals and the microsoft are far beyond ordinary people's imagination. Modern measurement and control technology is mainly composed of micro-variable sensors, high-performance low-noise cables, and weak signal amplifiers. , synchronous and coordinated development in practical application, mutual promotion and overall improvement. In military and civilian fields such as aerospace, nuclear power, navigation guidance, medical treatment, and industrial automation, it is ubiquitous and needed all the time, and it is even more essential in a higher environment. [0003] The noise value of ordinary phase-stable cables is between 5mV and 30mV. In some precision instrument cables, especially cables for test instruments...

AI Technical Summary

Problems solved by technology

Existing low-noise cables generally adopt the means of increasing thickness and multi-level shielding to reduce the influence of electromagnetic induction. Too thick a shielding layer will cause the weight of the cable to be heavy, and it is inconvenient to install and use. The shielding layer is too thin to ensure that the cable Steady transmission of signals, unable to adjust the contradiction between structure and performance

[0004] The root cause is the irrationality of the multi-level shielding structure, especially the use of semi-conductive graphite layer. After the cable is used for a period of time when it is repeatedly bent, the graphite may become discontinuous, resulting in a fault, and the part after the fault may increase. Cable noise, causing cable instability

Images