Dual-polarized shaped-reflector antenna
First Claim
1. An antenna for communicating two independent microwave signals being orthogonally polarized from a first point to multiple points, said antenna comprising:
- a plurality of conductive plates being substantially parallel, and separated by a distance of at least one-half a wavelength of the microwave signals, an opening between an edge of said conductive plates providing for transmission of the microwave signals;
a reflective surface coupled to said plurality of conductive plates, and disposed in reflective relation to the opening;
a plurality of surfaces coupled to edges of said plurality of plates, said plurality of surfaces forming wide and narrow apertures, the narrow and wide apertures directed toward said reflective surface;
a substantially square waveguide feed disposed in relation to the narrow aperture, and used for supplying the microwave signals through the narrow aperture; and
means, associated with said plurality of surfaces, for tapering the power density of the microwave signal.
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0 Petitions
Accused Products
Abstract
A hog-horn antenna for producing two orthogonally polarized signals. The elevation plane pattern of each signal can be made to have virtually any shape, but is typically of a substantially cosecant-squared shape. In providing for the dual-polarization capability, the hog-horn antenna is designed to produce substantially equal gains for orthogonal polarizations, either simultaneously or separately. Two techniques to substantially equate the elevation plane radiation patterns of the two polarizations include corrugating or absorber-lining the surfaces of portions of the hog-horn antenna. Azimuthal pattern control may be achieved by corrugated/absorber lined flanges.
236 Citations
22 Claims
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1. An antenna for communicating two independent microwave signals being orthogonally polarized from a first point to multiple points, said antenna comprising:
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a plurality of conductive plates being substantially parallel, and separated by a distance of at least one-half a wavelength of the microwave signals, an opening between an edge of said conductive plates providing for transmission of the microwave signals;
a reflective surface coupled to said plurality of conductive plates, and disposed in reflective relation to the opening;
a plurality of surfaces coupled to edges of said plurality of plates, said plurality of surfaces forming wide and narrow apertures, the narrow and wide apertures directed toward said reflective surface;
a substantially square waveguide feed disposed in relation to the narrow aperture, and used for supplying the microwave signals through the narrow aperture; and
means, associated with said plurality of surfaces, for tapering the power density of the microwave signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for manufacturing an antenna for communicating two independent microwave signals being orthogonally polarized, the method comprising:
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arranging a pair of conductive plates to be substantially parallel and at a separation distance of at least one-half a wavelength of the microwave signals, an aperture-opening between an edge of said conductive plates providing for transmission of the microwave signals;
coupling a reflective surface to said pair of conductive plates, the reflective surface being disposed in reflective relation to the aperture-opening;
mounting a plurality of surfaces to the conductive plates, the plurality of surfaces forming wide and narrow apertures, the narrow and wide apertures directed toward the reflective surface, portions of said plurality of surfaces having electromagnetic tapering characteristics; and
disposing a substantially square waveguide feed having an opening directed toward the narrow aperture. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A communication system operating to communicate information, the communication system comprising:
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a computing device;
a transmitter coupled to the computing device, the transmitter modulating data received by said computing device onto a microwave signal; and
an antenna coupled to said transmitter, said antenna including a pair of substantially parallel plates coupled to a feed horn and a reflector, the feed horn having a plurality of surfaces with microwave tapering characteristics to provide for a substantially cosecant-squared elevation-plane radiation pattern for a pair of orthogonally polarized signals. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification