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2 results about "Oblate spheroid" patented technology
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An oblate spheroid is a rotationally symmetric ellipsoid having a polar axis shorter than the diameter of the equatorial circle whose plane bisects it. Oblate spheroids are contracted along a line, whereas prolate spheroids are elongated. It can be formed by rotating an ellipse about its minor axis, forming an equator with the end points of the major axis. As with all ellipsoids, it can also be described by the lengths of three mutually perpendicular principal axes, which are in this case two arbitrary equatorial semi-major axes and one semi-minor axis. An everyday example of an oblate spheroid is the shape of confectionery such as Smarties or M&M's. The shape of the Earth is very close to that of an oblate spheroid. Though local topography deviates from this idealized spheroid, on a global scale these deviations are very small.
Lens antenna fed by a phased array
Methods, systems, and apparatus for making and using a lens antenna fed by a phased array. In some implementations, a communication device includes an antenna system includes a lens antenna and a feed antenna. The lens antenna can be a gradient index lens having a substantially oblate spheroid or substantially ellipsoidal shape, and having a plurality of layers that respectively have different dielectric constants. The feed antenna can include an array of antenna elements and can be spaced apart from the lens antenna. The communication device can include one or more processors configured to control excitation patterns for the antenna elements of the feed antenna to form beams directed at any of a range of spatial locations. The one or more processors can be configured to cause excitation patterns that concurrently excite multiple antenna elements of the feed antenna with different magnitudes and phase characteristics.
Owner:HUGHES NETWORK SYST
An oblate spheroid streamlined low-scattering carrier and a design method thereof
This invention discloses a flattened ellipsoidal streamlined low-scattering carrier, comprising a centrally symmetric flattened ellipsoidal streamlined shell, including a coaxial and identical top circular surface and a bottom circular surface, and a smooth transition surface between them. The smooth transition surface is formed by rotating a generatrix around a central axis. The generatrix is a smooth transition curve generated by lofting three cross-sectional surfaces and passing through the edges of the three cross-sections. The three cross-sections include the top circular surface, the bottom circular surface, and an intermediate reference plane located between them. The top and bottom circular surfaces are mirror-symmetric with respect to the intermediate reference plane. The diameters of the top and bottom circular surfaces are smaller than the diameter of the intermediate reference plane, and the vertical distance between them and the intermediate reference plane is the structural height. The three diameters and the structural height are related to the center wavelength of the target radar threat frequency band. This invention, through parameterized geometric proportion design, can obtain a carrier shape with stable low-scattering performance over a wide bandwidth and excellent high-frequency extension potential.
Owner:WUHU STATE-OWNED FACTORY OF MACHINING