![]() The second issue is moving from prototypes to production. Tapes and yarns are also compatible with soldering,through the use of special alloys. Shields can be terminated to backshells with steel bands and other compression techniques. Testing of the mechanical strength of the crimps suggests that the CNT yarns fail before the crimp fails. CNT conductors are compatible with existing contacts and can be terminated with standard crimping techniques, albeit with modified crimp tool settings and dies. The first is how to terminate CNT cables. Weight savings are 25 to 30 percent for hybrid shield constructions.Īs progress is made toward enabling the use of CNT materials in cables, two other issues deserve mention. For the double-braided cables common in aerospace applications, replacing one of the braids with CNT allows the remaining braid to handle low-frequency noise and lightning, while the CNT shield handles the higher frequencies. The high resistivity of CNT shields, however, means poor shielding performance below 100 MHz and an inability to provide protection against lightning strikes. A two-layer CNT tape offers roughly the same shielding as a copper braid at high frequencies-roughly 50 dB at 4 GHz-but weighs less than 2 percent of the braid it replaces. Initial IEEE 1394 cables will use CNT shielding, while MIL -STD-1553B cables will likely be the first all-CNT construction.ĬNT-based shields combine high shielding effectiveness with significant weight savings. Weight savings can also be important to ground vehicles and even soldier-worn equipment.ĬNT cables are now being actively developed for MIL-STD-1553B and IEEE 1394 applications for aerospace and satellite applications-with a transition from prototypes to production happening in the next few years. The benefits of CNT cable goes beyond aerospace applications.
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