Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1984-11-13
1986-07-15
McCamish, Marion C.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
343 18R, 343 18E, 428378, 428389, 428401, B32B 900
Patent
active
046006427
ABSTRACT:
Small lengths of conductors, cut to the appropriate size are used as radar "chaff" or passive reflectors to give spurious returns on an enemy radar and thereby act as an electronic countermeasure. Currently used chaff includes chopped aluminum foil, aluminum coated glass fibres and silver coated nylon monofilaments. Current radars operate in the 10.sup.10 Hz region and current chaff dipoles are of centimetric size, but future radar systems are likely to operate at higher frequencies requiring shorter dipoles lengths to achieve an increased packing density the dipoles also need to be thinner. Carbon fibres have advantages over existing chaff materials as they are fine, light and much stiffer than existing chaff materials. The electrical resistance is about 1000.times.higher than that of aluminum however and this invention therefore proposes the use of carbon fibres coated with a much more conductive coating. Typical coating materials can be copper, silver aluminium applied by a number of different methods.
REFERENCES:
patent: 4132828 (1979-01-01), Nakamuro et al.
patent: 4359737 (1982-12-01), Bond
patent: 4481249 (1984-11-01), Ebneth et al.
Brettle Jack
Lodge Kevin J.
McCamish Marion C.
Plessey Overseas Limited
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