Coaxial cable

Abstract

This invention provides a high-frequency coaxial cable comprising an inner conductor and an insulator layer covering the surface of the inner conductor. In the coaxial cable, the insulator layer has satisfactory side pressure resistance, and the attenuation level in the transmission is low. An insulating layer having a higher foaming level and a higher mechanical strength as compared with the conventional insulating layer can be formed by foam molding a resin composition comprising a cyclic olefin resin, a high-density polyethylene, and a low-density polyethylene and / or a linear low-density polyethylene. As a result, the insulator layer covered on the inner conductor in the coaxial cable has lowered dielectric loss tangent and lowered permittivity and possesses excellent transmission characteristics and mechanical properties.

Description

technical field The present invention relates to a coaxial cable using a cyclic olefin resin. Background technique In recent years, there has been an increasing demand for broadband communication such as mobile phones, the Internet, and wireless LANs (Local Area Networks). In addition, in order to transmit information at a higher speed and in large quantities, the frequency increase of electric signals is progressing remarkably. Therefore, there is a demand for a coaxial cable with a small amount of attenuation and a small signal delay in a high frequency band. A coaxial cable is mainly composed of a central conductor, an insulator layer provided thereon, and an outer conductor provided on its outer periphery. Low attenuation in high-frequency bands is important, and it is most effective to reduce the dielectric loss tangent of the insulating layer for realizing high-frequency coaxial cables. In addition, foaming is effective for further reducing attenuation. However, f...

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