▎ 摘　　要

NOVELTY - The heat-resistant radio frequency coaxial cable has an inner conductor, an insulating layer, a shielding layer and an outer protective sheath. The insulating layer is wrapped and arranged on the outer end surface of the inner conductor. The insulating layer is composed of three layers: an inner sheath layer, a foam layer and an outer sheath layer. The outer protective sleeve is fixedly connected to the outer end face of the shielding layer. The shielding layer includes a graphene inner shielding layer. The outer end surface of the graphene inner shielding layer is covered and connected with a ceramic fiber layer. The outer end surface of the ceramic fiber layer is wound and connected with a metal outer shielding layer. The outer protective sleeve includes an EP (300) rubber layer (41). The outer end surface of the EP (300) rubber layer is wound and coated with an elastic protective layer (42). USE - Heat-resistant radio frequency coaxial cable. ADVANTAGE - The method uses high-pressure foaming of carbon dioxide to insulate the foaming layer, which effectively ensures that the insulating layer of the cable has higher insulation performance, and at the same time, the return loss is also greatly improved. The shielding layer adopts a metal outer shielding layer and a graphene inner shielding layer, which greatly enhances the shielding effect of the cable. At the same time, a ceramic fiber layer is arranged in the middle, and the ceramic fiber layer is filled with a flame retardant for flame retardant and heat insulation. DETAILED DESCRIPTION - The heat-resistant radio frequency coaxial cable has an inner conductor, an insulating layer, a shielding layer and an outer protective sheath. The insulating layer is wrapped and arranged on the outer end surface of the inner conductor. The insulating layer is composed of three layers: an inner sheath layer, a foam layer and an outer sheath layer. The shielding layer is arranged on the outer end surface of the insulating layer. The outer protective sleeve is fixedly connected to the outer end face of the shielding layer. The shielding layer includes a graphene inner shielding layer. The outer end surface of the graphene inner shielding layer is covered and connected with a ceramic fiber layer. The outer end surface of the ceramic fiber layer is wound and connected with a metal outer shielding layer. The outer protective sleeve includes an elastic protective (300) rubber layer (41). The outer end surface of the rubber layer is wound and coated with an elastic protective layer (42). The inner end surface of the rubber layer is provided with protrusions (45) equidistantly distributed along the length direction of the cable at four directions. The outer end surface of the elastic protective layer is coated with aluminium oxide fibre layer (43). The outer end surface of the aluminium oxide the fibre layer is coated with a polyvinyl chloride coating layer (44). DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional structure of the inner and outer protective sheath of a heat-resistant radio frequency coaxial cable. 41Rubber layer 42Elastic protective layer 43Aluminium oxide fibre layer 44Polyvinyl chloride coating layer 45Protrusion