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| Number | Title | Issue Date |
| 7339551 | Reflective fresnel lens for sub-millimeter wave power distribution A reflective Fresnel lens for shaping an incident wave for efficiently delivering the incident wave to an array of receivers, having a wavelength within a predetermined range. The Fresnel lens comprises a ground plate and a plurality of reflective elements formed at... | 03/04/2008 |
| 7324064 | Passive anti-jamming antenna system System and method for improving the interference resistance of an radio frequency (RF) antenna system through passive prescreening of the RF energy incident upon the antenna. The invention physically partitions the RF environment into two or more sectors with respec... | 01/29/2008 |
| 7061447 | Reconfigurable antennas using microelectromechanical (MEMs) shutters and methods to utilize such A reconfigurable antenna is presented that uses MEMs shutters to reconfigure a Fresnel zone plate antenna. It can be used to either point a main beam in different directions or to point multiple beams in different directions. ... | 06/13/2006 |
| 6992643 | Passive anti-jamming antenna system System and method for improving the interference resistance of an radio frequency (RF) antenna system through passive prescreening of the RF energy incident upon the antenna. The invention physically partitions the RF environment into two or more sectors with respec... | 01/31/2006 |
| 6972730 | Antenna system A feed probe (1), a semicylindrical sub-reflector (2) forming a primary radiator together with the feed probe (1), and a main reflector (3) arranged such that mirror surfaces of said main reflector (3) and the sub-reflector face ac... | 12/06/2005 |
| 6952184 | Circularly polarized antenna having improved axial ratio A circularly polarized antenna system having improved axial ratio is disclosed. The antenna system comprises a circularly-polarized antenna, and a high-impedance buffer surface, surrounding the circularly polarized antenna, and disposed between the circularly polari... | 10/04/2005 |
| 6720936 | Adaptive antenna system An adaptive antenna system (20) includes a programmable reflection surface (22), a controller (24) in communication wit the programmable reflection surface (22), and a feeder element (26) outwardly spaced from a receiving side (... | 04/13/2004 |
| 6621459 | Plasma controlled antenna An improved plasma controlled millimeter wave (MMW) or microwave (μW) antenna is provided. A plasma of electrons and holes is photo-injected into a photoconducting wafer. A special distribution of plasma and a MMW/μW reflecting surface behind the wafer ... | 09/16/2003 |
| 6512483 | Antenna arrangements The performance of a microwave antenna is improved by incorporating a fine wire dielectric material which has a dielectric constant .di-elect cons. of less than unity at microwave frequencies. The effect of the dielectric material is to refract microwaves... | 01/28/2003 |
| 6496138 | Electromagnetic wave radar device mounted on a car An electromagnetic wave radar device mounted on a car, which helps improve external appearance of a car without impairing radar function, and is fabricated using a decreased number of parts at a reduced cost. The electromagnetic wave radar device comprise... | 12/17/2002 |
| 6473048 | Frequency selective microwave devices using narrowband metal materials A microwave device operating at a selected frequency band or group of selected frequency bands of interest includes a resonant bulk material having one or more conductivity bandwidths corresponding to the selected frequency band or group of selected frequ... | 10/29/2002 |
| 6426722 | Polarization converting radio frequency reflecting surface A polarization converting surface for reflecting impinging radio frequency waves. The surface includes a ground plane and a plurality of elements disposed in an array a distance from the ground plane. Each element is preferably connected to the ground pla... | 07/30/2002 |
| 6175449 | Transmission polarizer The invention relates to a device for changing the polarization of an incident electromagnetic wave. Existing devices to change the polarization of an incident electromagnetic wave preserve signal decoupling, i.e., the relation between useful polarization... | 01/16/2001 |
| 6169524 | Multi-pattern antenna having frequency selective or polarization sensitive zones 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 refl... | 01/02/2001 |
| 6043784 | Antenna lens in particular for a motor vehicle radar system An antenna lens, in particular for a motor vehicle radar system, has in a plane perpendicular to the optical axis of the antenna lens at least a first and a second lens region, the lens regions being configured such that electromagnetic waves are concentr... | 03/28/2000 |
| 5736966 | Adjustable microwave antenna The invention relates to a microwave antenna for the generation of a beam with adjustable parameters. Use is made of a reflective Fresnel zone plate that is written into a thin layer of silicon by means of a laser plus deflection means. A reflector is pos... | 04/07/1998 |
| 5675349 | Durable, lightweight, radar lens antenna A radar lens 14 is made from a conventional Fresnel lens 10, but replaces the conventional curved surface 32 with a stepped approximation thereto 22, 24, 26, preferably of three steps. The thickness of the stepped lens 14, at each step, is a half-waveleng... | 10/07/1997 |
| 5585812 | Adjustable microwave antenna The invention relates to a microwave antenna for the generation of a beam with adjustable parameters. Use is made of a reflective Fresnel zone plate that is written into a thin layer of silicon by means of a laser plus deflection means. A reflector is pos... | 12/17/1996 |
| 5486950 | Phase correcting zone plate A zone plate focusing radiation comprises a plurality of surface portions (20a, 20b, 20c, 20d, 30) corresponding to zones of the zone plate. The surface portions are positioned in a plurality P of parallel planes such that each surface portion diffracts r... | 01/23/1996 |
| 5469128 | Circuit elements for microwave and millimeter-wave bands and method of producing same A circuit element for microwave and millimeter-wave bands and a method of producing the same. A dielectric line is made of a pure dielectric resin. A high-frequency wave absorbing member is made of a pure dielectric resin containing at least one of first,... | 11/21/1995 |
| 5414438 | Space lattice passive repeater The Space Lattice Passive Repeater redirects radio waves in two directions, directly opposite to each other, and both perpendicular to the original path of radio wave propagation. The redirected radio waves, in the perpendicular paths, are polarized diffe... | 05/09/1995 |
| 5389944 | Phase correcting reflection zone plate for focusing microwave A zone plate for focusing microwave energy is provided comprising a plurality of reflective portions corresponding to zones of the zone plate, each reflective portion reflecting energy λ/P out of phase with respect to adjacent reflective portions, where ... | 02/14/1995 |
| 4905014 | Microwave phasing structures for electromagnetically emulating reflective surfaces and focusing elements of selected geometry The present invention concerns an electrically thin microwave phasing structure for electromagnetically emulating a desired reflective surface of selected geometry over an operating frequency band. The microwave phasing structure comprises a support matri... | 02/27/1990 |
| 4872019 | Radome-lens EHF antenna development A radome-lens comprises a shell of dielectric material having an outer surface in the form of a small circle defined by a sphere and a plane intersecting the sphere, an opening at one end of the shell for reception of an antenna therein, the surface havin... | 10/03/1989 |
| 4737796 | Ground plane interference elimination by passive element The radiation pattern of a beam at elevation angles near the horizon is improved for phased array antennas by control of the radiation field intensity near the horizon to reduce multipath disturbances, and to improve the axial ratio of a circularly polari... | 04/12/1988 |
| 4581615 | Double reflector antenna with integral radome reflector support A two reflector microwave antenna has a concave focusing main dish having an integral peripheral flange. An integral radome shell also having a peripheral flange is disposed in confronting relationship to the main dish flange. Mounted over both flanges is... | 04/08/1986 |
| 4482513 | Method of molding foam/aluminum flake microwave lenses A microwave lens is constructed of a homogeneous body of closed cell rigid polyurethane foam with aluminum flakes dispursed throughout and having a configuration defining an axis and opposed lens surfaces. The method of the invention includes selecting a ... | 11/13/1984 |
| 4194209 | Broadband waveguide lens antenna and method of fabrication Increased bandwidth in a waveguide lens antenna is achieved by altering the geometry of the stepped antenna guide plates in a manner that causes the net contribution of the antenna phase dispersion sources to result in zero average aperture phase error. D... | 03/18/1980 |
