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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 8077104 | 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... | 12/13/2011 |
| 7372373 | Embedded antenna and filter apparatus and methodology Apparatus and methodology are disclosed for providing effective transmission of data to and/or from an electricity meter by providing embedded radio frequency components. An antenna and stripline or microline filter arrangement are provided as embedded components in... | 05/13/2008 |
| 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 |
| 7224320 | Small wave-guide radiators for closely spaced feeds on multi-beam antennas A relatively low cost, easy to install and aesthetically pleasing digital video broadcast from satellite (DVBS) elliptical horn antenna designed to receive satellite television broadcast signals with circular polarity. This type antenna may be implemented as a multi... | 05/29/2007 |
| 7119756 | Radar horn antenna A radar horn antenna in which, to reduce or remove unnecessary echo from a specific angular range such as ground clutter, divergence in axial direction of a horn antenna 8 accommodated in a casing and covered with a radome is asymmetrical with respect to the ... | 10/10/2006 |
| 7084825 | Antenna and electronic device using the same An antenna capable of attaining the miniaturization thereof and the widening of a band in use, and an electronic device containing this antenna therein, having a miniaturized structure and adaptable to a wide band. This antenna is provided with a feeding element hav... | 08/01/2006 |
| 7009574 | Plural-reflector antenna system In order to lessen the deterioration of the VSWR, a plural-reflector antenna system is provided wherein an appropriately shaped vertex matching plate is disposed on the subreflector and electric waves that reenter the primary radiator are cancelled out. The e... | 03/07/2006 |
| 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 |
| 6862000 | Reflector antenna having low-dielectric support tube for sub-reflectors and feeds An antenna exhibiting improved transmission and reception capabilities. The antenna does not make use of a solid support tube or solid support rods used by previous antennas to support a sub-reflector or other device above a main reflector of the antenna. Instead, t... | 03/01/2005 |
| 6819298 | High-power microwave antenna system A high-power microwave antenna in which, in order to radiate a pulse (8), the antennas (4) of the high power microwave are actuated by a pulse-generating source (3) and are embodied normally as wire antennas, horn antennas or the like. In partic... | 11/16/2004 |
| 6809695 | Secondary reflector for SHF antennae of the Cassegrain type The invention concerns the secondary reflectors of SHF antennae of the Cassegrain type. It consists of providing the secondary basic reflector (103) of this antenna with a first circular ring (104) in the shape of a cylinder directed toward the ... | 10/26/2004 |
| 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 |
| 6608607 | High performance multi-band frequency selective reflector with equal beam coverage A high performance 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). In the first embod... | 08/19/2003 |
| 6307523 | Antenna apparatus and associated methods An antenna apparatus includes an antenna feed, a radio frequency (RF) receiver connected to the antenna feed, and a main reflector for reflecting received RF signals to the antenna feed along a received signal path. The antenna apparatus may also include ... | 10/23/2001 |
| 5913151 | Small antenna for receiving signals from constellation of satellites in close geosynchronous orbit A C-Band or Ku-Band satellite communication system uses a relatively small receiving antenna while operating within current FCC designated bandwidth and using existing satellite configurations. Aperture synthesis techniques create nulls in orbit locations... | 06/15/1999 |
| 5797082 | Communication receiver for receiving satellite broadcasts A C-Band or Ku-Band satellite communication system uses a relatively small receiving antenna while operating within current FCC designated bandwidth and using existing satellite configurations. Aperture synthesis techniques create nulls in orbit locations... | 08/18/1998 |
| 5047787 | Coupling cancellation for antenna arrays An arrangement for providing RF coupling cancellation between an array of antennas of a missile is shown. The present invention includes positioning a dielectric material across a portion of the axis of the waveguide antennas of a missile. The dielectric ... | 09/10/1991 |
| 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 |
| 4689632 | Reflector antenna system having reduced blockage effects A reflector antenna system with reduced blockage effects is provided by placing a compensating reflector between the surface of the main curved reflector and its primary feed to intercept illuminating radiation which would otherwise be blocked by the feed... | 08/25/1987 |
| 4500882 | Antenna system An antenna system includes a reflector and a primary and a subsidiary array antenna which are disposed in front of an aperture of the reflector so as to be positioned back-to-back with each other. An electric power which is supplied to the primary array a... | 02/19/1985 |
| 4272770 | Reflector antennae apparatus for limiting aperture blockage A reflector antennae assembly for reducing aperture blockage that includes an etched printed circuit board mounted on the sidewalls of a blocking structure. The board has spaced conductive squares or circles on one plane surface that is parallel to the di... | 06/09/1981 |
| 4176358 | Reflector antenna with matched feed system A reflector antenna is provided with two sets of perturbation reflectors, in the form of annular surface depressions, to reduce the effect of `external reflection` which is caused by energy re-entering a feed horn after reflection from the antenna. The tw... | 11/27/1979 |
| 4092648 | Reflex feed system for dual frequency antenna with frequency cutoff means A reflex feed system for a dual frequency antenna which may be, for example, one which transmits and receives both S and X-band signals, uses, in place of the dichroic plate normally employed for directing X-band radiation away from the X-band horn a flan... | 05/30/1978 |
| 4034378 | Antenna with echo cancelling elements A Cassegrainian antenna having a feed horn, a subreflector and a main reflector exhibits subreflector reflections back toward the feed horn. Some of this energy is reflected by the feed horn, and some by the main reflector adjacent to the feed horn, back ... | 07/05/1977 |
| 4031538 | Antenna with echo cancelling elements In a Cassegrainian antenna, radiation transmitted from the feed system is reflected back as an echo to the feed from the subreflector. In the prior art, a flat plate has been located near the subreflector to return an echo cancelling reflection to the fee... | 06/21/1977 |
| 3990080 | Antenna with echo cancelling elements Improvements are made in a dual frequency echo cancelling assembly for mounting in a hole in the subreflector of a Cassegrainian antenna. Subreflector echo returned to the feed system is cancelled in two frequency ranges by a reflection from the echo canc... | 11/02/1976 |
