Communications: radio wave antennas – Antennas – With housing or protective covering
Patent
1981-02-02
1987-06-30
Lieberman, Eli
Communications: radio wave antennas
Antennas
With housing or protective covering
H01Q 142
Patent
active
046774432
ABSTRACT:
A broadband high temperature radome includes a high density outer skin layer and a low density core layer made from a ceramic material selected from the group consisting of silicon nitride and barium-aluminum silicate. Silicon nitride is sintered, reaction-sintered or chemically vapor-deposited. The outer skin has a moderate dielectric constant of about 5.0 and the core layer has a low dielectric constant of about 1.8. Both dielectric constants do not sigificantly vary at temperatures up to 1500.degree. C. Low thermal expansion of the core and skin layers are matched by the thermal expansion of a base connector constructed in a laminated form of graphite/polyimide. The thickness of the core layer to the thickness of the skin layer is given by the ratio of about 15:1 where the skin layer thickness is about 0.030 inch. Polyimide resin is used for the high temperature adhesive to adhere the connector to the core and skin layers. The core layer is impregnated with a dielectric filler, if desired.
REFERENCES:
patent: 3292544 (1966-12-01), Caldwell et al.
patent: 3386918 (1968-06-01), Hough et al.
patent: 3545146 (1970-12-01), Kerr
patent: 3716869 (1973-02-01), Gould et al.
patent: 4020234 (1977-04-01), Garnder
patent: 4173187 (1979-11-01), Steverding
patent: 4252860 (1981-02-01), Brennan et al.
Metzcfr; Lightweight Ceramics Seen As Ideal For Radomes; Ceramic Industry; Jun. 1957, pp. 122, 123, 125.
Koetje Edward L.
Schorsch James F.
Simpson Frederick H.
Lieberman Eli
Murray Thomas H.
Poff Clifford A.
The Boeing Company
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