Mesh-configured rf antenna formed of knit graphite fibers

Details Mesh-configured rf antenna formed of knit graphite fibers Mesh-configured rf antenna formed of knit graphite fibers

1987-05-05

1989-03-14

Sikes, William L.

Communications: radio wave antennas

Antennas

Mesh, woven, braided or multiple strip

343909, 343912, H01Q 136

Patent

active

048128546

ABSTRACT:
An antenna reflector material for electromagnetic waves is comprised of knitted strands of fine diameter graphite filaments, which have been individually coated with a stress absorbing layer (e.g. a thin metallic or dielectric cladding). Because of the stress absorbing coating, the graphite fibers, which, by themselves, are inherently brittle and unable to tolerate substantial changes to their bend radius profiles, are able to be successfully knitted into a tricot mesh configuration and thereby yield an antenna surface material that possesses a near-zero coefficient of thermal expansion and a sufficiently low in-plane mechanical stiffness. After the tricot knit graphite mesh material has been formed, the cladding layer may be removed (e.g. by heat or chemically dissolved), without affecting the mechanical properties of the graphite strands of the tricot knit. The intended displacement capability of the loops of graphite strands within the knit mesh structure are retained, so that thermal inputs do not alter the performance characteristics of the graphite mesh antenna.

REFERENCES:
patent: 3855598 (1974-12-01), Keller
patent: 4092453 (1978-05-01), Jonda
patent: 4439768 (1984-03-01), Ebneth et al.
patent: 4549187 (1985-10-01), Levy
patent: 4609923 (1986-09-01), Boan et al.

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