Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7982680 | Antennas providing near-spherical coverage with right-hand circular polarization for differential GPS use Accuracy of derivation of local corrections to GPS signals for use for aircraft landing guidance is subject to effects of reflected multipath signals. Antennas with a near-spherical antenna pattern of right-hand circular polarization, except within a downward cone, ... | 07/19/2011 |
| 7394436 | Multi-beam and multi-band antenna system for communication satellites An antenna system includes a reflector having a modified-paraboloid shape; and a multi-beam, multi-band feed array located at a focal point of the reflector so that the antenna system forms a multiple congruent beams that are contiguous. The system has a single refl... | 07/01/2008 |
| 7385552 | Real-time, cross-correlating millimeter wave imaging system using dual pill-box antennas A method and apparatus are disclosed for forming an image from millimeter waves. A field of view scanned using two geometrically orthogonal, intersecting copolarized fan beams (110, 120) to receive millimeter wave radiation. The received millimeter wave radia... | 06/10/2008 |
| 7276990 | Single-pole multi-throw switch having low parasitic reactance, and an antenna incorporating the same A switch arrangement comprises a plurality of MEMS switches arranged on a substrate about, and close to, a central point, each MEMS switch being disposed on a common imaginary circle centered on the central point. Additionally, and each MEMS switch is preferably spa... | 10/02/2007 |
| 7253699 | RF MEMS switch with integrated impedance matching structure An impedance matching structure for a RF MEMS switch having at least one closeable RF contact in an RF line, the impedance matching structure comprising a protuberance in the RF line immediately adjacent the RF contact that forms one element of a capacitor, the othe... | 08/07/2007 |
| 7245269 | Adaptive beam forming antenna system using a tunable impedance surface A method of and apparatus for beam steering. A feed horn is arranged so that the feed horn illuminates a tunable impedance surface comprising a plurality of individually tunable resonator cells, each resonator element having a reactance tunable by a tuning element a... | 07/17/2007 |
| 7165449 | Slot antenna An antenna in a radar level gauge for determining the level of the surface of a medium stored in a tank. The antenna has a first and a second electrically conductive layer, and between the conductive layers a dielectric layer. The second of the conductive layers is ... | 01/23/2007 |
| 7164387 | Compact tunable antenna The present disclosure relates to a method and an antenna for transmitting/receiving a RF signal at a plurality of different frequencies. Transmitting/receiving a RF signal at a plurality of different frequencies is achieved by providing a F antenna comprising a plu... | 01/16/2007 |
| 7154451 | Large aperture rectenna based on planar lens structures A rectenna structure comprising a flexible, dielectric sheet of material; a plurality of metallic lenslets disposed on the sheet of material; and a plurality of diodes disposed on the sheet of material, each diode in said plurality of diodes being arranged at a focu... | 12/26/2006 |
| 7138958 | Reflector antenna radome with backlobe suppressor ring and method of manufacturing A radome adapted to reduce backlobes of an associated reflector antenna via application of a conductive ring with an inward facing edge about the periphery of the radome. The conductive ring may be applied extending around the radome periphery to an inside and or ou... | 11/21/2006 |
| 7102583 | Multi-band antenna having a reflector A multi-band antenna with a reflector, comprising a box-shape reflector, wherein the box-shape reflector includes a base plate, a surrounding sidewalls and an extending plate, wherein the extending plate and the base plate are respectively attached on both sides of ... | 09/05/2006 |
| 7071888 | Steerable leaky wave antenna capable of both forward and backward radiation Leaky wave antenna beam steering that is capable of steering in a backward direction, as well as further down toward the horizon in the forward direction than was previously possible, and also directly toward zenith. The disclosed antenna and method involve applying... | 07/04/2006 |
| 7068234 | Meta-element antenna and array An antenna having at least one main element and a plurality of parasitic elements. At least some of the elements have coupling elements or devices associated with them, the coupling elements or devices being tunable to thereby control the degree of coupling between ... | 06/27/2006 |
| 7061438 | Radio-control antenna support arm for lifting machinery The invention relates to radio-control of lifting machinery, and is intended to solve problems due to the presence of interfering metal masses. For this purpose, the support arm of the radio-control antenna is mounted such that it is able to be orientated about a ve... | 06/13/2006 |
| 7042397 | Phase-shifting cell for an antenna reflectarray The invention relates to phase-shifting cells constituting the passive reflectarrays of antennas with a reconfigurable transmission direction, transmitting in the microwave range. More particularly, the invention describes, within the context of phase-shifting cells... | 05/09/2006 |
| 6980169 | Electromagnetic lens In an exemplary apparatus implementation, an electromagnetic lens includes: an input section including multiple input probes and a curvilinear input reflector; an output section including multiple output probes and a curvilinear output reflector; and a coupling sect... | 12/27/2005 |
| 6977624 | Antenna directivity enhancer An antenna directivity enhancer to enhance the directivity of an antenna is disclosed. The enhancer has a 3-dimensional structure in a predefined 3-dimensional shape when operating to enhance the directivity of an antenna. The 3-dimensional structure can be flexibly... | 12/20/2005 |
| 6803883 | Radio frequency electromagnetic emissions shield A shield for shielding radio frequency emissions being emitted from a communications antenna. The shield has a first layer of material having the physical property of generally absorbing radio frequency electromagnetic emissions and a second layer of material having... | 10/12/2004 |
| 6639566 | Dual-polarized shaped-reflector antenna 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 cap... | 10/28/2003 |
| 6459414 | Dual-polarized and circular-polarized antennas The invention relates to an antenna structure for radiating electromagnetic waves in predetermined polarization configurations. A dielectric substrate is provided with a copper conductive pattern printed on each side. The conductors act as scattering elem... | 10/01/2002 |
| 6404401 | Metamorphic parallel plate antenna The present invention provides a low-cost, steerable antenna formed with a dielectric medium separating a pair of conductive plates and a centrally located signal feed. Switches selectively interconnect the conductive plates through the dielectric medium ... | 06/11/2002 |
| 6323816 | Sector beam antenna with scattering component A sector beam antenna with a scattering component, in which a desired radiation pattern can be obtained, is provided. The sector beam antenna with the scattering component provides parallel plates composed of two conductive plates disposed in parallel in ... | 11/27/2001 |
| 6275196 | Parabolic horn antenna for wireless high-speed internet access A parabolic horn antenna designed for use as a high isolation antenna array in a wireless Internet access system where a high concentration of transceivers at one location is required. The rear, reflecting surface of the horn part of the antenna is a para... | 08/14/2001 |
| 5579021 | Scanned antenna system Compact, microwave scanned antennas include combinations of a radiator, a reflector and a mirror. The radiator is formed by plating a shaped dielectric core. It generates an antenna beam at an output aperture in response to a microwave signal at an input ... | 11/26/1996 |
| 5486837 | Compact microwave antenna suitable for printed-circuit fabrication A compact microwave antenna suitable of printed-circuit fabrication is comprised of a non-radiating guided wave structure for supporting the propagation of captured surface-guided waves; a series of dipoles in proximity to the guided waves supported by th... | 01/23/1996 |
| 4876554 | Pillbox antenna and antenna assembly A directive communications antenna comprising upper and lower plates, each having a leading edge, and a parabolic reflecting cylinder disposed between and axially intersecting the plates so as to form a cavity having a focus line. The cavity is open adjac... | 10/24/1989 |
| 4864319 | Radio frequency antenna with small cross-section An array antenna is shown, the disclosed antenna having an effective cross-sectional area which is lower than its physical cross-sectional area. The reduction in effective cross-sectional area is effected by: (a) fabricating the reflector for the array an... | 09/05/1989 |
| 4345257 | Primary radar antenna having a secondary radar (IFF) antenna integrated therewith A primary radar antenna has a secondary radar antenna or an IFF antenna integrated therewith. Excellent properties with respect to compactness, radiation and frequency dependency are achieved by providing a bilevel pillbox antenna having radiation deflect... | 08/17/1982 |
| 4329692 | Primary radar antenna having a secondary radar antenna integrated therewith A primary radar antenna, designed as a pillbox antenna, has an IFF antenna integrated therewith. Excellent properties with regard to compactness, radiation and frequency dependency are achieved through the combination of a pillbox antenna with a multiple ... | 05/11/1982 |
| 4297710 | Parallel-plane antenna with rotation of polarization A parallel-plane antenna of the pillbox or cheese type in which the cylindrical-parabolic portion is constituted by a semitransparent reflector and the focal plane of which is constituted by a polarizing reflector. The cylindrical-parabolic semitransparen... | 10/27/1981 |
| 4187507 | Multiple beam antenna array The multiple beam, short wave planar antenna array system, which simultaneously exhibits low loss, low side lobe levels, high efficiency, and low volume in a design affording independent control of the E and H plane radiation pattern shapes is particularl... | 02/05/1980 |
| 3945009 | Antennae with linear aperture In order to compensate for the displacement of a coherent pulse airborne radar, the latter is provided with means for alternately linearly moving forward and backward the phase centre of its antenna system, at the reception, from one cycle radar to the ne... | 03/16/1976 |
