Patent ID: 6815611
Filing Date: 2004-11-09
Classification: H01B

Abstract:
A helical shielded twisted pair data cable comprisingan individual insulated twisted pair cable, a shielding tape selected from the group consisting of a metal tape, a first composite tape having a non-metal base and a layer of metal on one side of said base, and a second composite tape having a non-metal base and a layer of metal on both sides of said base; said shielding tape being helically wrapped with an overlap of 45-55% and at an angle to the longitudinal axis of the twisted pair cable of 30-45Â° around said twisted pair cable; said shielding tape having a metal thickness of 0.75 to 1.25 mils; said shielding tape being wrapped around said twisted pair at a tension to eliminate a substantial amount of the air to leave a cross-sectional void area of less than 18% of the cross-sectional area of the shielded twisted pair cable to provide said helical shielded twisted pair data cable; and to provide said helical shielded twisted pair data cable with a rating at least out to 600 MHz and an adjusted to 20Â° C. standard impedance deviation of 3.5 or less when said standard deviation is calculated around a mean or average impedance of 90 to 110 ohms.