Patent ID: 8779293
Filing Date: 2014-07-15
Classification: H01B

Abstract:
1. A coaxial cable comprising: an inner conductor located at a center portion of the cable; an insulator surrounding a surface of the inner conductor; an outer conductor surrounding an outside surface of the insulator; and a sheath surrounding the outer conductor, wherein the outer conductor has a corrugated tube shape having corrugation crests and corrugation troughs formed therein, and wherein an outer diameter I of the insulator, an inner diameter D wherein a space between the inner conductor and an inner surface of the outer conductor is filled up with the insulator so that an air layer isolated within a corrugated portion of the outer conductor is formed between the insulator and the corrugation crest of the outer conductor, wherein a highest point of the corrugation crest formed in the outer conductor is expanded in the longitudinal direction of the cable, forming a straight line section in the corrugation crest on a cross-section of the longitudinal direction of the cable, wherein the outer diameter I of the insulator is larger than the inner diameter D wherein an above-to-below ratio of the lengths of the outer conductor above and below a median line between a maximum height of the corrugation crest and a minimum height of the corrugation trough of the outer conductor, has a range from 0.5 to 0.8.