| 摘要 |
PROBLEM TO BE SOLVED: To provide a covered wire by a porous polytetrafluoroethylene (hereinafter referred to as "PTFE") insulating layer of which PTFE insulating layer is made porous, which has a pulling force between the center conductor and an insulating layer even if the dielectric loss is reduced, and which has an excellent attenuation even in a high frequency region, and provide a coaxial cable using the covered wire by the porous PTFE insulating layer, and its manufacturing method. SOLUTION: In the paste extrusion molding using a tubing extrusion method in which the PTFE resin-made insulating layer 12 is formed at the outer periphery of the center conductor 11 by covering when the PTFE resin is extruded to cover the center conductor 11, after the PTFE resin is covered, in a state of being not tightly adhered to the insulating layer 12, on the center conductor 11, and stretched and made porous in a continuous furnace such that a gap q exists between the insulating layer 12 and the center conductor 11 in an unbaked state the insulating layer is shrinked in baking, to manufacture a porous fluororesin insulating electric wire 10 which is imparted with the pulling force between the center conductor and the insulating layer. COPYRIGHT: (C)2008,JPO&INPIT
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