Device for reflecting the electromagnetic waves of a polarization and a method of construction of said device
AssigneeThomson-CSF
InventorsClaude Aubry, Jean Bouko, Serge Drabowitch
Life of this patent
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Abstract
A microwave reflector having metallic surfaces and nonmetallic surfaces is perfectly reflecting for the waves of a first polarization and partly transparent for the waves of a second polarization orthogonal to the first. The reflector is primarily applicable to radar systems.
Claims11
A microwave reflector having metallic surfaces and nonmetallic surfaces, said metallic surfaces being positioned for perfectly reflecting the waves of a first polarization and partly transmitting the waves of a second polarization orthogonal to said first polarization, wherein the metallic surfaces are located at the intersections of the reflector surface with a series of lines which pass through a focal point 0 of said reflector and through a horizontal circle included in a sphere having a center at said focal point 0.
An antenna according to claim 6, wherein said antenna comprises two rectangular horns which operate with crossed polarization.
A microwave reflector which is perfectly reflecting for the waves of a first polarization and partly transparent for the waves of a second polarization orthogonal to said first polarization, comprising metallic surfaces and nonmetallic surfaces, wherein said metallic surfaces are placed at the intersection of the reflector surface and planes represented by the equation:
- ay.+-.cos.alpha.(cz-b.sup.2)=0
- where
- y, z are the coordinates in the reference frame O, x, y, z,
- a is a distance between the apex of the reflector and the intersection of the asymptotes to the reflector,
- c is the focal half-distance of the reflector,
- b=.sqroot.c.sup.2 -a.sup.2,
- .alpha.is a semivertical angle.
A method of construction of a microwave reflector which is reflecting for a first polarization and transparent for a second polarization, wherein metallic surfaces are formed on a hyperboloid of revolution at the intersection of said hyperboloid of revolution with the planes represented by the equation:
- ay.+-.cos .alpha.(cz-b.sup.2)=0
- where
- y and z are the coordinates in the reference frame O, x, y, z,
- a is the distance between the apex of the reflector and the intersection of the asymptotes to the reflector,
- c is the focal half-distance of the reflector,
- b=.sqroot.c.sup.2 -a.sup.2,
- .alpha.=is a semivertical angle.
Dependencies are inferred from the claim text.