Cylindrical paraboloid weather cover for a horn reflector antenna with wave absorbing means
First Claim
1. A horn reflector antenna comprisingan offset main reflector (18) including a reflecting surface and a focal point associated therewith;
- absorbing material (36) disposed on the edge of said reflecting surface closest to said focal point;
a feed arrangement (10, 12, 14,
16) disposed at said focal point and in relation to said reflector so as to create an antenna aperture, said feed arrangement capable of transmitting and receiving microwave radiation; and
a weather cover (26) disposed at said aperture capable of reflecting a portion of said microwave radiation emanating from said feed arrangement and impinging the surface thereof;
CHARACTERIZED IN THATthe weather cover further comprises a cylindrical paraboloid shape, said weather cover disposed to be capable of focusing the impinging radiation onto the edge of the reflecting surface containing the absorbing material.
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Abstract
The present invention relates to a method for reducing the weather cover-induced reflection sidelobes associated with horn reflector antenna arrangements. More particularly, the present invention consists of attaching the weather cover (26) to curved forms (21,23) placed in the antenna aperture, where the forms are shaped to contour the weather cover into a cylindrical paraboloid form, this form being capable of focusing the reflections from the weather cover onto a line inside the antenna arrangement. By covering this line inside the antenna with microwave absorbing material, (36) the focused weather cover reflections may be absorbed, thereby significantly reducing the sidelobes caused by the presence of the weather cover.
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Citations
4 Claims
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1. A horn reflector antenna comprising
an offset main reflector (18) including a reflecting surface and a focal point associated therewith; -
absorbing material (36) disposed on the edge of said reflecting surface closest to said focal point; a feed arrangement (10, 12, 14,
16) disposed at said focal point and in relation to said reflector so as to create an antenna aperture, said feed arrangement capable of transmitting and receiving microwave radiation; anda weather cover (26) disposed at said aperture capable of reflecting a portion of said microwave radiation emanating from said feed arrangement and impinging the surface thereof; CHARACTERIZED IN THAT the weather cover further comprises a cylindrical paraboloid shape, said weather cover disposed to be capable of focusing the impinging radiation onto the edge of the reflecting surface containing the absorbing material. - View Dependent Claims (2, 3, 4)
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Specification