Offset-fed reflector parallel plate antenna apparatus
| DWPI Title: Antenna apparatus for use in radar system of e.g. airplane, has reflector element comprising nonresonant waveguide cavity, and aperture for receiving and transmitting electromagnetic signal and defining outer perimeter of cavity |
| Abstract: An antenna apparatus described herein includes a first reflector element that comprises a first nonresonant waveguide cavity that is partially bounded by a first parabolic reflector surface. The apparatus optionally includes additional reflector elements arranged in parallel with the first reflector element, where the additional reflector elements include corresponding nonresonant waveguide cavities that are partially bounded by corresponding reflector surfaces. The antenna apparatus is configured to emit an electromagnetic signal based upon electromagnetic signals reflected by the one or more parabolic reflector surfaces and output by the one or more reflector elements. The antenna apparatus may conversely be employed to receive an electromagnetic signal. |
| Use: Antenna apparatus for use in a variety of different technical fields, such as communications, radar, etc., coupled to an aerial vehicle e.g. airplane, drone, ground vehicle such as automobile, bus, freight-carrying truck, spacecraft, or watercraft. |
| Advantage: The antenna apparatus exhibits improved pattern gain and radiation efficiency, a lower geometric cross-section compared to conventional antenna apparatuses, and better dispersion characteristics. The reflector elements in the array can optionally be arranged radially or in parallel with one another and have the same or similar size and shape. The overall impedance bandwidth of the waveguide splitter can be increased by employing known impedance matching techniques between splitters. |
| Novelty: The antenna apparatus (100) has a reflector element (102-106) that comprises a non-resonant waveguide cavity. The reflector includes a support surface including an offset reflector feed configured to receive and transmit an electromagnetic signal. A parabolic reflector surface opposite the support surface is adapted to reflect the electromagnetic signal and an aperture adapted to receive. The aperture defines an outer perimeter of the cavity. A bottom metallic planar surface is parallel to a top metallic surface. The top and bottom metallic surfaces are orthogonal to the reflector, aperture, and support surface. A dielectric window adjacent the aperture partially fills cavity. |
| Filed: 12/12/2022 |
| Application Number: US18079130A |
| Tech ID: SD 15655.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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