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6822622 |
Electronically reconfigurable microwave lens and shutter using cascaded frequency selective surfaces and polyimide macro-electro-mechanical systems
A radio frequency reconfigurable lens is provided. In particular, a lens comprising at least two opposed frequency selective surface sheets is provided. A relative phase shift may be imparted to an...
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6774862 |
Multibeam antenna apparatus
A multibeam antenna apparatus is disclosed. The multibeam antenna apparatus includes a main reflector ( 1 ), a sub-reflector ( 2 ), a focused beam feeder ( 3 ), a primary radiator array ( 5 )...
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6759993 |
Dual polarization antenna with low side lobes
Dual polarisation antenna having low side lobes, useful in a satellite radio communication system. The antenna includes a reflector assembly ( 12 ) illuminated by a feed source ( 11 ). The...
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6727863 |
Planar band gap materials
The present invention relates to planar materials having bandgap properties. The materials are formed by depositing conductive fractal patterns on a non-conducting substrate. The bandgap...
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6693497 |
Device for converting circularly oscillating electromagnetic radiation beams into linearly oscillating radiation beams
A device is disclosed for converting a circularly polarized electromagnetic radiation into linearly polarized electromagnetic radiation. The device includes a depolarizer with depolarizing elements...
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6690327 |
Mechanically reconfigurable artificial magnetic conductor
In an artificial magnetic conductor, the distance between the frequency selective surface and the ground plane is mechanically varied to adjust the effective inductance or capacitance of the...
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6677911 |
Antenna feed assembly capable of configuring communication ports of an antenna at selected polarizations
The present invention provides antenna feed assemblies that allow the common waveguide portion of an antenna feed assembly to be rotated independent of a fixed communication waveguide. When...
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6642901 |
Horn antenna apparatus
In a horn antenna apparatus for use in an antenna system for radar, some of the excited radio waves in a TE11 mode in a radio-wave input portion 1 are converted to those in a higher mode in a...
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6593893 |
Multiple-beam antenna employing dielectric filled feeds for multiple and closely spaced satellites
An approach for providing a multiple-beam antenna system for receiving and transmitting electromagnetic signals from a plurality of closely spaced satellites is disclosed. Dielectric inserts are...
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6577430 |
Bi-directional optical switch
The present invention provides improved optical switches in which no mechanical movement is required to direct optical pathways between plural fiber ports and light transmission is bi-directional....
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6567048 |
Reduced weight artificial dielectric antennas and method for providing the same
An artificial anisotropic dielectric material can be used as a microstrip patch antenna substrate. The artificial dielectric can be easily designed for the purpose of weight reduction. Preferably,...
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6567057 |
Hi-Z (photonic band gap isolated) wire
A high impedance (Hi-Z) wire effectively transparent to electromagnetic radiation polarized in the direction of the wire, within an operating frequency band. The Hi-Z wire is sheathed with a thin...
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6563470 |
Dual band frequency polarizer using corrugated geometry profile
An antenna system that employs an antenna element for both transmit and receive functions, where a dual band polarizer is used to convert linearly polarized signals to circularly polarized signals...
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6563472 |
Reflector antenna having varying reflectivity surface that provides selective sidelobe reduction
A composite antenna reflector architecture for improving beam-to-beam isolation in a multi-spot illuminated reflector antenna employs a plurality of annular rings surrounding a central reflective...
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6549172 |
Antenna provided with an assembly of filtering materials
An antenna includes a probe capable of transforming electrical energy into electromagnetic energy and inversely. It further includes an assembly of elements made of at least two materials different...
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6545647 |
Antenna system for communicating simultaneously with a satellite and a terrestrial system
An antenna system for receiving both circularly polarized electromagnetic signals and linearly polarized electromagnetic signals, the circularly polarize signals arriving at the antenna system from...
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6542647 |
Optical signal transmission system and magneto-optical modulator designed to establish modulation over wide range for use in the same
An optical signal transmission system equipped with a magneto-optical modulator is provided. The magneto-optical modulator works to modulate an optical beam emitted from a light source and consists...
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6529174 |
Arrangement relating to antennas and a method of manufacturing the same
The present invention refers to an arrangement in an antenna, the arrangement comprising: an electrically thin microwave phasing structure including a support member, a reflective arrangement for...
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6525695 |
Reconfigurable artificial magnetic conductor using voltage controlled capacitors with coplanar resistive biasing network
A frequency reconfigurable artificial magnetic conductor (AMC) includes a ground plane, a spacer layer disposed adjacent the ground plane and a plurality of vias in electrical contact with the...
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6522215 |
Converter for receiving satellite signal with dual frequency band
A polarizer for a dual frequency band is formed of square waveguides of a dual structure. A section is formed which extends in a step-like manner as deeper inside between outer and inner square...
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6496155 |
End-fire antenna or array on surface with tunable impedance
A steerable antenna and method of steering a radio frequency wave received by and/or transmitted from the antenna. The antenna includes a tunable high impedance surface and at least one end-fire...
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6476771 |
Electrically thin multi-layer bandpass radome
A bandpass radome that reduces the number of spurious resonances, and that tends to suppress Transverse Magnetic TM and Transverse Electric TE surface waves, is described. In one embodiment, the...
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6473053 |
Dual frequency single polarization feed network
An antenna system that employs antenna elements for both transmit and receive functions. Signals received by each antenna element are directed to a dual band polarizer that converts the signals to...
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6473051 |
Elliptic to circular polarization converter and test apparatus incorporating the same for accommodating large axial ratio
A hood is provided for verifying the performance of the missile. The hood includes one or more sense antennas having the same polarization as the antennas within the missile to be tested. The hood...
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6452559 |
Circular-Polarized-wave converter
A dielectric plate, serving as a 90-degree phase device, is disposed inside a waveguide. A phase-converting portion of uniform thickness is formed at the central portion of the dielectric plate,...
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6452549 |
Stacked, multi-band look-through antenna
The present invention features a stacked, multi-band, antenna system consisting of a low-frequency, forward portion and a gridded, rear portion designed for operation at a higher frequency. Both...
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6445359 |
Low noise block down converter adapter with built-in multi-switch for a satellite dish antenna
A low noise block down converter adapter for an antenna includes a Y-shaped housing that is mated to one end of a support bracket, as well as a plurality of low noise block down converters with...
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6437752 |
Antenna with double-band electronic scanning, with active microwave reflector
A dual-band electronic scanning antenna, with an active microwave reflector. The antenna includes at least two microwave sources transmitting in different frequency bands and having opposite...
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6433752 |
Multiple antenna reflectors for microwave imaging and sounding
An apparatus and method for microwave imaging and sounding with large bandwidth radiometer reflector antennas in a compact form. The apparatus comprises a main reflector for reflecting a beam, a...
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6433756 |
Method of providing increased low-angle radiation sensitivity in an antenna and an antenna having increased low-angle radiation sensitivity
An improved low-angle radiation antenna is obtained through excitation of a tangential electric field on the high-impedance surface, as well as leaky transverse-electric surface waves. Such fields...
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6430239 |
Process of cyclic detection in diversity of polarization of digital cyclostationary radioelectric signals
The disclosure relates to a process of cyclic detection in diversity of polarization of digital cyclostationary radioelectric signals. The process consists in acquiring the signals on a network of...
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6421022 |
Dual band hybrid solid/dichroic antenna reflector
A spaceborne hybrid antenna reflector for dual frequency band illumination of common spot beam coverage regions contains an interior solid reflector region, that is adjacent at its perimeter to a...
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6414645 |
Circularly polarized notch antenna
A circularly polarized single point feed notch antenna functions on land, sea, air and space vehicles and communicates using a broad frequency range while maintaining stealth during installation on...
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6411261 |
Artificial magnetic conductor system and method for manufacturing
The invention provides an artificial magnetic conductor (AMC) system and method for manufacturing. The AMC has a post plane with posts and slots. The posts are operatively disposed adjacent to...
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6396449 |
Layered electronically scanned antenna and method therefor
A layered, electronically scanned antenna. The antenna includes a plurality or array layers separated by dielectric spacers. Each array layer includes a transistor switched grid formed by a...
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6396450 |
Programmable image antenna
The present invention provides a programmable image antenna formed on the face plate of a cathode ray tube (CRT) or on another substrate. The inner CRT face is coated with a silicon semiconductor...
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6396451 |
Precision multi-layer grids fabrication technique
A multi-layer grid ( 20 ) for an antenna system ( 10 ). The multi-layer grid 20 includes a first panel ( 22 ) and a second panel ( 24 ). Each panel is formed utilizing a pair of outer layers (...
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6392611 |
Array fed multiple beam array reflector antenna systems and method
Array fed multiple beam antenna systems and methods for use on an orbiting spacecraft carrying a communication system. The antenna systems include a reflector and a relatively small array feed...
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6384796 |
Antenna for radiating and receiving electromagnetic waves
An antenna intended for radiating and receiving electromagnetic waves and including a parabolic reflector and an exciter, which is designed as a sub-reflector and which is attached in the focal...
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6346918 |
Scan independent array for circular polarization reception and transmission
An antenna includes first and second arrays spaced apart by a dielectric slab having a predetermined thickness, each of the first and second arrays provided from antenna elements having a linear...
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6344832 |
Frequency converter arrangement for parabolic antennae
The invention concerns a frequency converter arrangement for parabolic antennae receiving vertical and horizontal linear polarization signals, transmitted by two geostationary satellites not far...
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6329957 |
Method and apparatus for transmitting and receiving multiple frequency bands simultaneously
An antenna feed system capable of simultaneously receiving and transmitting in multiple frequency bands is disclosed. In one embodiment, the feed system comprises a dielectric loading rod, an inner...
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6317096 |
Antenna system
The invention relates to an antenna system for motor vehicles. This system allows mobile reception of television and radio broadcasts and of data of geostationary satellites independently of the...
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6313803 |
Monolithic millimeter-wave beam-steering antenna
The addition of semiconductor spacers into the spaces between the metal strips of a metal grid permits electron-hole plasmas to be introduced there controllably. Thus, the grid can be made to...
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6313804 |
Continuous aperture scanning antenna
A method and a device are disclosed for the generation of a surface, the reflection phase gradient or transmission phase gradient of which will be varied by means of a controllable static electric...
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6307522 |
Folded optics antenna
An antenna (1) having an EM feed (6), a rear parabolic twist reflector (3) and a front transreflector (2). The transreflector is closer to the parabolic twist reflector than the focal point of the...
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6297710 |
Slip joint polarizer
A slip joint polarizer including a stationary waveguide rotatably connected to a moveable waveguide, e.g. an ortho mode transducer, by a mating interface, such as a pair of rotatable mating...
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6285332 |
Frequency selective reflector
A frequency selective reflector is provided for use in an electromagnetic antenna system, wherein the frequency selective reflector reflects electromagnetic waves having two or more frequencies....
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6278409 |
Wire detection system and method
A system for wire detection comprising a transmitter for transmitting multi-polarity waves, means for receiving waves reflected off target and means for analyzing the polarization of the reflected...
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6252559 |
Multi-band and polarization-diversified antenna system
A multiple band, polarization diversified antenna system that accommodates a plurality of independent and separate antenna subsystems that share a common aperture and boresight. The antenna system...
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