Reflector antenna with a self-supported feed
First Claim
1. In an antenna system, a reflector in a feed element for radiating and intercepting electromagnetic waves, comprising:
- a) a main reflector; and
b) a self-supported waveguide feed element located along the axis which passes through the center of said main reflector, said feed element including;
1) a support-tube which has a first, inner end attached to the center of said main reflector and a second, outer end located near the focal region of the reflector;
2) a waveguide in said tube;
3) a sub-reflector located outside said second, outer end of said tube and said waveguide, said sub-reflector having a diameter larger than said second, outer end of said support-tube;
4) a gap provided between said sub-reflector and said second, outer end of said tube;
5) said sub-reflector consisting of reflective material with a plurality of rotationally symmetric grooves; and
6) said plurality of grooves of said sub-reflector which are located outside a diameter equal to the diameter of said support-tube being filled with a dielectric material.
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Abstract
The present invention provides a reflector antenna which has dual polarization with low cross polarization within the main lobe and side lobes of the radiation pattern. The antenna includes a dish-shaped main reflector with a center located, self-supporting tubular feed element and a sub-reflector mounted on the free end of the tube and located at the focal area of the main reflector. The tube and sub-reflector are separated by a space which can be open or filled with a dielectric material. The diameter of the sub-reflector is greater than the tube. The surface of the sub-reflector facing the main reflector includes one or more concentric circular corrugations which can be filled with a dielectric material.
66 Citations
14 Claims
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1. In an antenna system, a reflector in a feed element for radiating and intercepting electromagnetic waves, comprising:
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a) a main reflector; and b) a self-supported waveguide feed element located along the axis which passes through the center of said main reflector, said feed element including; 1) a support-tube which has a first, inner end attached to the center of said main reflector and a second, outer end located near the focal region of the reflector; 2) a waveguide in said tube; 3) a sub-reflector located outside said second, outer end of said tube and said waveguide, said sub-reflector having a diameter larger than said second, outer end of said support-tube; 4) a gap provided between said sub-reflector and said second, outer end of said tube; 5) said sub-reflector consisting of reflective material with a plurality of rotationally symmetric grooves; and 6) said plurality of grooves of said sub-reflector which are located outside a diameter equal to the diameter of said support-tube being filled with a dielectric material. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In an antenna system, a reflector in a feed element for radiating and intercepting electromagnetic waves, comprising:
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a) a main reflector; and b) a self-supported waveguide feed element located along the axis which passes through the center of said main reflector, said feed element including; 1) a support-tube which has a first, inner end attached to the center of said main reflector and a second, outer end located near the focal region of the reflector; 2) a waveguide in said tube; 3) a sub-reflector located outside said second, outer end of said tube and said waveguide, said sub-reflector having a diameter larger than said second, outer end of said support-tube; 4) a gap provided between said sub-reflector and said second, outer end of said tube; 5) said sub-reflector consisting of reflective material with a plurality of rotationally symmetric grooves; and 6) said plurality of grooves of said sub-reflector which are located outside a diameter equal to the diameter of said support-tube being covered with a dielectric material which is directly touching the grooves. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification