Patent
Multi-pattern antenna having frequency selective or polarization sensitive zones
Te-Kao Wu,Charles W. Chandler +1 more
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TLDR
In this paper, a multi-pattern antenna for providing a plurality of antenna patterns at different frequencies or polarizations from a single reflector body eliminates the need for multiple reflector antennas on a single spacecraft.Abstract:
A multi-pattern antenna for providing a plurality of antenna patterns at different frequencies or polarizations from a single reflector body eliminates the need for multiple reflector antennas on a single spacecraft. The reflector antenna comprises a reflector body and an illumination source. The illumination source illuminates the reflector with a plurality of RF signals each of a preselected frequency or polarization. The reflector comprises a plurality of zones with each zone reflecting preselected RF signals. A plurality of antenna patterns are generated from the reflected RF signals. Each zone is sized to a preselected shape such that the antenna patterns have a desired shape or beamwidth characteristic.read more
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Patent
Stepped-reflector antenna for satellite communication payloads
Sudhakar K. Rao,Minh Tang +1 more
TL;DR: In this paper, a stepped reflector for being illuminated by at least one multiple-band feed is provided, which includes a central region and a first annular region with an annular width of w. The reflector may be parabolically curved or may alternately be shaped.
Patent
Apparatus and method for concentrating electromagnetic energy on a remotely-located object
TL;DR: In this article, a method for concentrating radio frequency (RF) radiation on an object located in proximity to a reflector includes the steps of: selecting a target reflector and a level of power for conveying to the target reflectors by reradiation from the source reflector, determining a resonance profile of the target reflectsor, selecting a transmission profile matching the resonance profile, the transmission profile comprising the at least one resonant frequency, and transmitting RF radiation in accordance with the transmission profiles towards the target reflections.
Patent
Radome having localized areas of reduced radio signal attenuation
TL;DR: In this paper, a radome having localized areas of reduced radio signal attenuation includes a body having a first portion and a second portion, where the first portion has a reduced radio attenuation property in a transmit band and the second portion has an increased attenuation in a reception band.
Patent
Frequency selective reflector
TL;DR: In this paper, a frequency selective reflector is provided for use in an electromagnetic antenna system, wherein the reflector includes an inner portion which has a reflective surface which will reflect at least first and second frequencies.
Patent
High performance multi-band frequency selective reflector with equal beam coverage
TL;DR: In this paper, a multi-band antenna reflector having low sidelobe and cross polarization levels, and a superior carrier-to-interference ratio has two concentric zones (12, 14 in a first embodiment and 102, 104 in a second embodiment).
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Patent
Microwave phasing structures for electromagnetically emulating reflective surfaces and focusing elements of selected geometry
TL;DR: In this article, an electrically thin microwave phasing structure for electromagnetically emulating a desired reflective surface of selected geometry over an operating frequency band was proposed, which can be used to emulate a desired microwave focusing element of a selected geometry.
Patent
Identical surface shaped reflectors in semi-tandem arrangement
TL;DR: In this paper, a dual-gridded shaped reflectors (10) and (20) are arranged one behind the other for transmitting and receiving orthogonally polarized energy waves.
Patent
Common aperture dual mode seeker antenna
TL;DR: The disclosed common aperture seeker (CAWS) as discussed by the authors consists of a parabolic array of crossed dipoles, which is substantially reflective for radiated electrical signals in one band, and substantially transmissive for radiometric signals outside of that band.
Patent
Reflector antenna for operation in more than one frequency band
TL;DR: In this article, the concave surface of the antenna reflector body is provided with surface zones arranged in regular arrays or patterns, and the same antenna is capable of handling frequencies in a plurality of different band widths and different apertures.