Circular Patents (Class 342/365)
  • Patent number: 10236587
    Abstract: An antenna having an emission unit emits first and second polarized waves which intersect each other and a supply unit that supplies the first and second polarized waves to the emission unit is provided. The supply unit includes a plurality of cross-shaped coupling apertures that allow first and second slots that the first and second polarized waves are transmitted to intersect and supply the first and second polarized waves to the emission unit. The first and second polarized wave guide directs the first and second polarized waves to the plurality of cross-shaped coupling apertures. The distances from first polarized wave supply slots to the first polarized waves to the first polarized wave guide to the plurality of cross-shaped coupling apertures and from second polarized wave supply slots to the second polarized waves to the second polarized wave guide to the plurality of cross-shaped coupling apertures are respectively about the same.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: March 19, 2019
    Assignee: Hyundai Motor Company
    Inventor: Dongjin Kim
  • Patent number: 10116065
    Abstract: A system according to one embodiment includes a first antenna element configured to communicate a first signal, the first signal polarized in a first orientation; a second antenna element co-located with the first antenna element, the second antenna element configured to communicate a second signal, the second signal polarized in a second orientation, the second orientation orthogonal to the first orientation; and driver circuitry coupled to the first antenna element and the second antenna element, the driver circuitry configured to process the first signal and the second signal to achieve signal diversity in a wireless communication link.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: October 30, 2018
    Assignee: Intel Corporation
    Inventor: Helen K. Pan
  • Patent number: 9722687
    Abstract: A wireless transmitter has a modulator modulating an information signal of a frequency f1 by a carrier wave of a frequency f2 to output a first modulated signal, a transmitting antenna transmitting the first modulated signal using a linearly polarized wave, and a motor rotating the transmitting antenna at a frequency f3 to rotate the outgoing linearly polarized wave at the frequency f3 thereby multiplexing the first modulated signal with a linearly polarized wave component and a horizontally polarized wave component, the two components being independent of each other. A wireless receiver has diversity receiving antennas receiving the signal on a plurality of polarization planes to obtain a plurality of input signals; a path difference phase shifter compensating each of the input signals for the phase shift stemming from path differences, and a composer composing the corrected received signals.
    Type: Grant
    Filed: April 8, 2016
    Date of Patent: August 1, 2017
    Assignee: HITACHI, LTD.
    Inventor: Ken Takei
  • Patent number: 9705588
    Abstract: A wireless communication system is provided that is capable of enabling more wireless devices to perform concurrent communication using a polarized wave technology.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: July 11, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Aono, Ken Takei
  • Patent number: 9698665
    Abstract: Provided are methods and circuits for a controller for a control system, comprising first and second control loops that operate substantially independently, wherein the first control loop is an amplitude control loop and the second loop is a phase or frequency control loop. In some embodiments the amplitude control loop operates at an amplitude that is proportional to an amplitude of an input signal at a fundamental system frequency and at a selected harmonic of a fundamental system frequency; and the frequency control loop operates at a fundamental system frequency and at a selected harmonic of the fundamental system frequency. The frequency control loop may adaptable to a fundamental control system frequency or to a selected harmonic of the fundamental control system frequency. The controller may be implemented as a resonant controller and used in various ac systems, and offers high structural robustness in digital implementations.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: July 4, 2017
    Assignee: SPARQ SYSTEMS, INC.
    Inventors: Sayed Ali Khajehoddin, Masoud Karimi Ghartemani, Praveen K. Jain, Alireza Bakhshai
  • Patent number: 9647331
    Abstract: An antenna assembly may include a first ground plane, a second ground plane that may be switched between grounding and non-grounding states, and first and second antenna layers. Each of the first and second antenna layers may include a plurality of pixels interconnected by a plurality of phase change material (PCM) switches. The PCM switches are configured to be selectively switched between phases to provide a plurality of antenna patterns within the first and second antenna layers.
    Type: Grant
    Filed: April 15, 2014
    Date of Patent: May 9, 2017
    Assignee: The Boeing Company
    Inventors: Charles W. Manry, Jr., Eric J. Black
  • Patent number: 8989289
    Abstract: A method and system for transmitting three distinct electromagnetic signals on a same frequency are provided. One or more transmitting devices transmit a first data signal and an inverse of the first data signal in two orthogonal linear polarities of an antenna maintaining their inverted phase relationship and a same amplitude as propagated. Transmitting devices also transmit a second data signal in a linear polarity with a 45 degree rotation around the transmit axis of the first data signal. Transmitting devices also transmit a third data signal in linear polarity orthogonal to the second data signal and consequently 315 degree rotation around the transmit axis from the first data signal.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: March 24, 2015
    Inventor: Nigel Iain Stuart Macrae
  • Publication number: 20150077289
    Abstract: According to one embodiment, a wireless communication device includes a first antenna. The wireless communication device includes a second antenna which performs at least one of transmission and reception of an electromagnetic wave to and from the first antenna while rotating at a predetermined position or revolving along a predetermined orbit. The first antenna is arranged such that an element of the first antenna is not to be parallel to a plane perpendicular to a polarization plane of the electromagnetic wave which is transmitted from one antenna toward the other antenna while the second antenna rotates or revolves.
    Type: Application
    Filed: August 28, 2014
    Publication date: March 19, 2015
    Inventors: Takayoshi ITO, Koji AKITA
  • Publication number: 20150070215
    Abstract: A poly spiral antenna includes spiral antenna sections and interconnecting traces. A first spiral antenna section has a first interwoven spiral pattern and a first excitation configuration to provide a first radiation pattern component. A second spiral antenna section has a second interwoven spiral pattern and a second excitation configuration to provide a second radiation pattern component. A third spiral antenna section has a third interwoven spiral pattern and a third excitation configuration to provide a third radiation pattern component. The interconnecting traces couple the first, second, and third spiral antenna sections together such that the first, second, and third radiation pattern components form a radiation pattern of the poly spiral antenna.
    Type: Application
    Filed: September 30, 2013
    Publication date: March 12, 2015
    Applicant: BROADCOM CORPORATION
    Inventors: Nicolaos Georgiou Alexopoulos, Seunghwan Yoon, Alfred Grau Besoli
  • Publication number: 20150009068
    Abstract: A method and apparatus for electronically steering an antenna system. The apparatus comprises a dielectric substrate, a plurality of radiating spokes, and a number of surface wave feeds. The plurality of radiating spokes is arranged radially with respect to a center point of the dielectric substrate. Each radiating spoke in the plurality of radiating spokes forms a surface wave channel configured to constrain a path of a surface wave. Each of the number of surface wave feeds couples at least one corresponding radiating spoke in the plurality of radiating spokes to a transmission line that carries a radio frequency signal.
    Type: Application
    Filed: August 5, 2014
    Publication date: January 8, 2015
    Inventors: Daniel J. Gregoire, Amit M. Patel, Michael de La Chapelle
  • Publication number: 20150002335
    Abstract: Ellipticity reduction in circularly polarized array antennas is provided herein. An antenna array may include a processor that is configured to control a plurality of elements, each of the plurality of elements producing an elliptically polarized wave having an eccentricity value, the elliptically polarized wave traveling along a direction of propagation, wherein at least a portion of the plurality of elements are incrementally clocked around their direction of propagation, so that a combined output of the plurality of elements is substantially circularly polarized.
    Type: Application
    Filed: June 26, 2014
    Publication date: January 1, 2015
    Inventors: Brian Hinman, Paul Eberhardt
  • Publication number: 20140253379
    Abstract: The present invention is related to a device for generating waveguide modes for use in a feed horn of a satellite antenna system, said waveguide modes comprising at least one excitation mode of higher order than the fundamental mode, said device comprising a waveguide containing a first waveguide section with at least three longitudinal slots extending in the inner side of said waveguide, characterised in that said waveguide contains a second waveguide section with at least three longitudinal slots extending in said inner side of said waveguide.
    Type: Application
    Filed: October 2, 2012
    Publication date: September 11, 2014
    Inventors: Bart Baekelandt, Philip Sanders, Guy Verstraeten
  • Patent number: 8605807
    Abstract: A method and system for transmitting electromagnetic signals are provided. Data signals including a first data signal conveying first data, a second data signal conveying second data, and a third data signal conveying third data are provided. One or more transmitting devices transmit the first data signal and an inverse of the first data signal in two orthogonal linear polarities of an antenna maintaining their inverted phase relationship as propagated. Transmitting devices also transmit the second data signal in a linear polarity with a 45 degree rotation around a transmit axis of the first data signal. Transmitting devices also transmit the third data signal in a linear polarity orthogonally from the second data signal and consequently ±45 degrees from the first data signals. One or more receiving stations receive the transmitted first data signal, the inverse of the first data signal, the second data signal and the third data signal.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: December 10, 2013
    Inventor: Nigel Iain Stuart Macrae
  • Publication number: 20130088391
    Abstract: In an exemplary embodiment, a phased array antenna comprises multiple subcircuits in communication with multiple radiating elements. The radio frequency signals are independently adjusted for both polarization control and beam steering. In a receive embodiment, multiple RF signals of various polarizations are received and combined into at least one receive beam output. In a transmit embodiment, at least one transmit beam input is divided and transmitted through multiple radiating elements, with the transmitted beams having various polarizations. In an exemplary embodiment, the phased array antenna provides multi-beam formation over multiple operating frequency bands. The wideband nature of the active components allows for operation over multiple frequency bands simultaneously.
    Type: Application
    Filed: December 3, 2012
    Publication date: April 11, 2013
    Applicant: ViaSat, Inc.
    Inventor: ViaSat, Inc.
  • Publication number: 20120032847
    Abstract: A system for dynamically reconfiguring the radiation pattern of a collection of slot antennas. A collection of slot antennas of various lengths and widths are fabricated. The control system independently drives the feed to one or more slot antennas to produce the desired radiation pattern. The control system activates and deactivates the feed to different slot antennas, thus dynamically reconfiguring the generated radiation pattern.
    Type: Application
    Filed: August 5, 2011
    Publication date: February 9, 2012
    Applicant: Utah State University
    Inventor: Reyhan Baktur
  • Patent number: 8098197
    Abstract: The present invention is a device which includes an antenna and circuitry. The antenna may receive a circularly-polarized signal as first and second linearly-polarized signals. The circuitry is connected to the antenna and is configured for combining the first and second linearly-polarized signals to produce at least two reception patterns. The reception patterns are created by summing the first and second linearly-polarized signals via phase shifting. The reception patterns are optimized for at least two substantially different directional orientations. Further, the antenna may simultaneously allow/provide spec-compliant Global Positioning System operation and spec compliant Height of Burst operation.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: January 17, 2012
    Assignee: Rockwell Collins, Inc.
    Inventors: Brian J. Herting, Lee M. Paulsen, James H. Doty, James B. West, Nathan P. Lower
  • Patent number: 7986260
    Abstract: Circularly-polarized antennas and their methods of use for active holographic imaging through barriers. The antennas are dielectrically loaded to optimally match the dielectric constant of the barrier through which images are to be produced. The dielectric loading helps to remove barrier-front surface reflections and to couple electromagnetic energy into the barrier.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: July 26, 2011
    Assignee: Battelle Memorial Institute
    Inventors: Douglas L McMakin, Ronald H Severtsen, Wayne M Lechelt, James M Prince
  • Publication number: 20110122024
    Abstract: A device and method for determining a distance and/or orientation of a movable object includes a transmitter that is located on the object and a receiver. One of the transmitter and the receiver has an antenna having a known polarization plane. The other of the transmitter and the receiver has a counterclockwise circular polarized antenna and a clockwise circular polarized antenna.
    Type: Application
    Filed: July 27, 2009
    Publication date: May 26, 2011
    Applicant: Fraunhofer-Gesellschaft zur Forderng der angewandt forschung E.V
    Inventors: Andreas Eidloth, Hans Adel, Jörn Thielecke, Alexander Popugaev
  • Patent number: 7865152
    Abstract: The disclosed system, device and method for a signal modulation apparatus generally includes a first signal generator suitably configured to generate a first continuous wave radio frequency (RF) signal, and a second signal generator suitably configured to generate a second continuous wave RF signal. A dual-circular polarized antenna may be adapted to receive the first continuous wave RF signal into a right-hand port and the second continuous wave RF signal into a left-hand port, where the signals are combined into a modulated RF signal in the dual-circular polarized antenna.
    Type: Grant
    Filed: October 19, 2007
    Date of Patent: January 4, 2011
    Assignee: Raytheon Company
    Inventor: Kenneth Brown
  • Publication number: 20100295728
    Abstract: The present invention discloses an array antenna, which comprises a first antenna, a second antenna, a phase shift unit and an impedance unit. The first antenna is arranged for receiving a satellite signal and has a first radiation field plane. The second antenna is arranged for receiving the satellite signal and has a second radiation field plane. The phase shift unit is connected to the first antenna and the second antenna, and the phase shift unit is provided for generating an orthogonal state of phase difference between the first antenna and the second antenna. The impedance unit is connected to the phase shift unit for matching the first antenna, the second antenna and the phase shift unit.
    Type: Application
    Filed: May 24, 2010
    Publication date: November 25, 2010
    Applicant: MITAC INTERNATIONAL CORP.
    Inventor: LI CHEN
  • Patent number: 7262729
    Abstract: A radar system having a processor, a waveform generator, a plurality of antenna interfaces, a set of first antennas configured to transmit a waveform, and a set of second antennas configured to receive a reflected waveform is disclosed. The waveform generator and antenna interfaces are in control and signal communication with the processor, each of the first antennas are in signal communication with one of each antenna interface, and each of the second antennas are in signal communication with one of each antenna interface. The waveform generator is in control and signal communication with each antenna interface, and is configurable to generate a waveform conforming to at least two ISM bands. Each first antenna is configured to transmit a circularly polarized electromagnetic waveform, and each second antenna is configured to receive a reflected circularly polarized electromagnetic waveform complementary to the first antennas.
    Type: Grant
    Filed: June 19, 2006
    Date of Patent: August 28, 2007
    Assignee: General Electric Company
    Inventors: John Erik Hershey, Ralph Thomas Hoctor, David Michael Davenport, Jeffrey Michael Ashe, Richard Louis Frey, Kenneth Brakeley Welles, V. Paul Staudinger, Harold W. Tomlinson, Jr.
  • Patent number: 6583685
    Abstract: A matching circuit for a screen antenna receives on its signal input an MF or LF signal output of a screen antenna and feeds a signal though its signal output via a capacitive feeder to a radio receiver. The matching circuit includes components which operate in conjunction with capacitances in components connected to the signal input and the signal output to form an internally-terminated band-pass filter network having a pass-band which covers a range of frequencies to be received by the receiver.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: June 24, 2003
    Assignee: Glass Antennas Technology Limited
    Inventors: Brian Easter, Keith Jeremy Twort, John Davies
  • Patent number: 6570536
    Abstract: A communications system in which a communications channel is defined at least in part by an electromagnetic wave having a carrier frequency and an electric field vector, the extremity or terminus of which traces a non-linear periodic path at a rotation frequency less than the carrier frequency and greater than zero from the perspective of an observer looking into the axis of propagation of the wave. The transmitter of the communications system launches a wave having such characteristics and modulated with information in a suitable manner. The receiver of the communications system is sensitive to the periodic path and rotation frequency. The combination of the periodic path and the carrier frequency provides selectivity that can be used to define multiple communications channels.
    Type: Grant
    Filed: July 9, 2001
    Date of Patent: May 27, 2003
    Assignee: Smith Technology Development, LLC.
    Inventor: Stephen H. Smith
  • Patent number: 6559796
    Abstract: A satellite provides a time signal that is adjusted for position of a receiver on the surface of the Earth. A receiver determines appropriate local time from the time signal, and can adjust a local clock accordingly, the satellite time signal in the form of a rotating beam containing angular information to determine the position of the satellite transmitter for proper synchronization. A fixed receiver can also measure the radiation angle of the transmitted beam.
    Type: Grant
    Filed: July 17, 2000
    Date of Patent: May 6, 2003
    Assignee: Steinbeis Transferzentrum Raumfahrtsysteme
    Inventors: Felix Huber, Ernst Messerschmid, Wolfgang Schäfer
  • Patent number: 6441779
    Abstract: A system and a method for determining a satellite antenna attitude are disclosed. Radio signals from a satellite, such as a GPS satellite, are received by a plurality of coupled antenna elements forming an antenna array. Local attitude values of the antenna array and/or the antenna elements with respect to a reference plane are determined using a shaft encoder or gyro, whereas a carrier-phase antenna attitude is determined from the received radio signals. The array and/or array elements are rotated over a predetermined angle and a correction value of the antenna attitude is determined from a time-averaged difference between the local attitude values and the carrier-phase attitude values.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: August 27, 2002
    Assignee: KVH Industries, Inc.
    Inventors: Sidney M. Bennett, Ronald Paradis
  • Publication number: 20020057218
    Abstract: A communications system in which a communications channel is defined at least in part by an electromagnetic wave having a carrier frequency and an electric field vector, the extremity or terminus of which traces a non-linear periodic path at a rotation frequency less than the carrier frequency and greater than zero from the perspective of an observer looking into the axis of propagation of the wave. The transmitter of the communications system launches a wave having such characteristics and modulated with information in a suitable manner. The receiver of the communications system is sensitive to the periodic path and rotation frequency. The combination of the periodic path and the carrier frequency provides selectivity that can be used to define multiple communications channels.
    Type: Application
    Filed: July 9, 2001
    Publication date: May 16, 2002
    Applicant: Basic Research Corporation
    Inventor: Stephen H. Smith
  • Patent number: 6351237
    Abstract: A receiving system 100 is disclosed which includes at least one antenna 101 providing a plurality of antenna beams providing signal diversity between communicated signals. A first processing branch 103 is included for processing a first plurality of signals appearing within a first plurality of the antenna beams. The first processing branch 103 includes a plurality of signal paths, some of which include delays 105, each receiving a one of the first plurality of signals from a corresponding one of the first plurality of antenna beams. Delays 105 apply a predetermined amount of delay proportionate to the corresponding one of the beams. First processing branch 103 further includes a combiner 106 for combining the first plurality of signals after output from the plurality of signal paths. A second processing branch 104 is provided for processing a second plurality of signals appearing within a second plurality of the antenna beams.
    Type: Grant
    Filed: November 29, 1999
    Date of Patent: February 26, 2002
    Assignee: Metawave Communications Corporation
    Inventors: Gary A. Martek, Sheldon K. Meredith, Douglas O. Reudink, Mark Reudink, Martin J. Feuerstein
  • Patent number: 6271790
    Abstract: A communications system in which a communications channel is defined at least in part by an electromagnetic wave having a carrier frequency and an electric field vector, the extremity or terminus of which traces a non-linear periodic path at a rotation frequency less than the carrier frequency and greater than zero from the perspective of an observer looking into the axis of propagation of the wave. The transmitter of the communications system launches a wave having such characteristics and modulated with information in a suitable manner. The receiver of the communications system is sensitive to the periodic path and rotation frequency. The combination of the periodic path and the carrier frequency provides selectivity that can be used to define multiple communications channels.
    Type: Grant
    Filed: April 23, 1998
    Date of Patent: August 7, 2001
    Assignee: Smith Technology Development LLC
    Inventor: Stephen H. Smith
  • Patent number: 6252546
    Abstract: A method and apparatus for processing multipath reflection effects in timing systems is disclosed in which a determination is made of whether a received signal is a reflected signal. A detector provides from an input signal a pair of signals representative of whether the input signal contained right-hand circularly polarized and left-hand circularly polarized components. The representative signals are separately processed in synchronized logic circuits to determine relative power levels. The power levels are compared to determine the nature of the dominant polarization of the input signal.
    Type: Grant
    Filed: October 19, 2000
    Date of Patent: June 26, 2001
    Assignee: Trimble Navigation Limited
    Inventors: Gary R. Lennen, Scott R. Smith
  • Publication number: 20010003442
    Abstract: A communications system in which a communications channel is defined at least in part by an electromagnetic wave having a carrier frequency and an electric field vector, the extremity or terminus of which traces a non-linear periodic path at a rotation frequency less than the carrier frequency and greater than zero from the perspective of an observer looking into the axis of propagation of the wave. The transmitter of the communications system launches a wave having such characteristics and modulated with information in a suitable manner. The receiver of the communications system is sensitive to the periodic path and rotation frequency. The combination of the periodic path and the carrier frequency provides selectivity that can be used to define multiple communications channels.
    Type: Application
    Filed: April 23, 1998
    Publication date: June 14, 2001
    Inventor: STEPHEN SMITH
  • Patent number: 6204810
    Abstract: A communications system in which a communications channel is defined at least in part by an electromagnetic wave having a carrier frequency and an electric field vector, the extremity of which traces a non-linear periodic path at a second frequency between the carrier frequency and zero from the perspective of an observer looking into the axis of propagation of the wave. The transmitter of the communications system launches a wave having such characteristics and modulated with information in a suitable manner. The receiver of the communications system is sensitive to the periodic path and second frequency. Either the periodic path, the second frequency, or both provide selectivity that can be used to define multiple communications channels.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: March 20, 2001
    Assignee: Smith Technology Development, LLC
    Inventor: Stephen H. Smith
  • Patent number: 6175327
    Abstract: GPS receivers are provided that reduce all types of interference signals with a simple receiver structure that includes an antenna system having a reference antenna element and a plurality of auxiliary antenna elements, a plurality of phase shifters and a power combiner. The receiver also includes a downconverter, a digital GPS processor and an analog-to-digital converter (ADC). Each antenna element generates a single output signal in response to all polarization components of a GPS signal. In response to a composite signal of interference signals and GPS signals, the reference antenna element provides a reference signal and the auxiliary antenna elements provide auxiliary signals which each has a phase difference from the reference signal that is a function of its respective auxiliary antenna element's location in an antenna array space and of paths of the interference signals.
    Type: Grant
    Filed: January 16, 1999
    Date of Patent: January 16, 2001
    Assignee: Sensors Systems, Inc.
    Inventors: Zhen-biao Lin, Seymour Robin
  • Patent number: 6154173
    Abstract: A method and apparatus for processing multipath reflection effects in timing systems is disclosed in which a determination is made of whether a received signal is a reflected signal. A detector provides from an input signal a pair of signals representative of whether the input signal contained right-hand circularly polarized and left-hand circularly polarized components. The representative signals are separately processed in synchronized logic circuits to determine relative power levels. The power levels are compared to determine the nature of the dominant polarization of the input signal.
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: November 28, 2000
    Assignee: Trimble Navigation Limited
    Inventors: Gary R. Lennen, Scott R. Smith
  • Patent number: 6005514
    Abstract: A correction to a differential phase measurement used for vehicle attitude determination on nonaligned antenna arrays is determined by calculating a carrier phase angle of carrier signals received by each antenna, and correcting the measurement for the right-hand circular polarization effect on the nonaligned antennas. Accordingly, circular polarization effects of the carrier signals are removed from a nonaligned antenna array, allowing the nonaligned antenna array to be used for vehicle attitude determination.
    Type: Grant
    Filed: September 15, 1997
    Date of Patent: December 21, 1999
    Assignee: United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Edgar Glenn Lightsey
  • Patent number: 5995044
    Abstract: A GPS receiver embodying the invention includes a first channel that preferentially processes line-of-sight signals and a second channel that preferentially processes multipath signals. It then compares the results to determine if the multipath has degraded the results of the processing of the line-of-sight signals.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: November 30, 1999
    Assignee: NovAtel, Inc.
    Inventors: Waldemar Kunysz, Thomas J. Ford, Janet Neumann
  • Patent number: 5982326
    Abstract: An active microwave antenna device includes a two-port micropatch antenna which receives signals having a first circular polarization and transmits signals of opposite circular polarization. The device includes an integrated active circuit for amplifying and, optionally, filtering the signal. An array of such devices can be formed on a single substrate, each device being an independent active antenna, thus eliminating the need for RF or IF feed networks between the devices. Such arrays are believed to be particularly suitable for spatial power combining, rapid beam scanning, microwave imaging, frequency-polarization selective processes, and other related applications. The arrays may be either reflective or transmissive.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: November 9, 1999
    Inventors: Yung Leonard Chow, Saffieddin Safavi-Naeini
  • Patent number: 5903238
    Abstract: In a radio station for mobile communication systems, the reception branches of at least two antenna units having different polarization are monitored in order to acquire statements about the polarization direction of the incident wave. Corresponding to the polarization direction of the incident wave, an adaptive fashioning of the radiation characteristic ensues, this fashioning the polarization direction of the emitted wave according to the weighting of the reception signals of the reception branches for the same communication connection. The connection from a base station to a mobile station in a mobile communication system therefore can be improved with an inventive radio station.
    Type: Grant
    Filed: September 22, 1997
    Date of Patent: May 11, 1999
    Assignee: Siemens Aktiengesellschaft
    Inventors: Joerg Sokat, Michael Faerber, Dieter Emmer, Kolio Ivanov, Peter Weber
  • Patent number: 5790076
    Abstract: The multi-dimensional tracking sensor especially for virtual reality and other real time computer applications. The disclosure describes an electro-magnetic (EM) tracking sensor that consists of a small lightweight transmitter with a transmitting antenna located on the target to be tracked and an array receiver with several local stationary antenna elements (FIG. 1). Multiple antenna elements of the array receiver lie on the perimeter of the measured space in positions determined by a self-calibration procedure. The proposed device calculates a cross correlation function between two signals at each receiving unit to determine a spatial position of the tracked element.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: August 4, 1998
    Inventor: Jozef Sypniewski
  • Patent number: 5504493
    Abstract: A phase array transmitting antenna system, including a plurality of radiating elements, each radiating element is capable of transmitting radiation. One or more constant phase and amplitude amplifiers are affixed to the radiating element in the array, wherein each radiating element is capable of producing radiation of a substantially uniform phase as the other radiating elements in the array, but distinct amplitudes according to patterns which simplify implementation.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: April 2, 1996
    Assignee: Globalstar L.P.
    Inventor: Edward Hirshfield
  • Patent number: 5434575
    Abstract: A circularly polarized phased array antenna system for both reception and transmission applications includes a plurality of planar radiating (or receiving) elements, a switching matrix for each radiating element, a beamforming network and a transmit/receive module. Each planar element includes 4.times.N radially disposed segments that may be selectively connected with the four modes of a circularly polarized signal such that two opposing segments function as the two respective arms of a dipole radiating element and two orthogonal such dipoles function as a crossed pair of dipoles for receiving or transmitting the circularly polarized signal. The switching matrix and the beamforming network cooperate to determine the polarization phase of the radiating element by commutating the four modes of the circularly polarized signal to any four orthogonal segments of the radiating element.
    Type: Grant
    Filed: January 28, 1994
    Date of Patent: July 18, 1995
    Assignee: California Microwave, Inc.
    Inventors: Carl O. Jelinek, Daniel W. Drago, Jr., Richard C. Dempsey
  • Patent number: 5420597
    Abstract: A simulation device is provided for testing autotrack antennas. The device includes a mode coupler and transmit horn which are identical to the mode coupler and transmit horn of the antenna to be tested. The mode coupler has a plurality of waveguide input ports for transmitting voltage signals which are complex conjugates of signals occurring under receiving conditions. The device then generates a signal that simulates the far-field, plane-wave testing environment and applies this signal to an antenna to be tested.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: May 30, 1995
    Assignee: TRW Inc.
    Inventor: James W. Duncan
  • Patent number: 5027123
    Abstract: An adaptive interference canceller for use in a dual polarized radar system for receiving cross-polar and like-polar signals and generating an output signal corresponding to the received cross-polar signal with a like-polar interfering component cancelled therefrom. A modified adaptive filter is provided with a self-adjusting impulse response conforming to a least means square adjustment cancelling the influence of the like-polar signal, which is generally much stronger on the cross-point signal. The resulting output has a high target-to-clutter ratio and therefor a high probability of detection.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: June 25, 1991
    Inventors: Simon Haykin, Andrew Ukrainec
  • Patent number: 4881077
    Abstract: A radar arrangement which is particularly useful for the terrain following radar of an aircraft avoids disturbances from rain echoes by utilizing an antenna arrangement with a transmitting/receving directional antenna which is circularly polarized. A supplementary receiving antenna of orthogonally-circularly polarized type is used in conjunction with the directional antenna. From a comparison of the signal level distinctions is made between a target and a rain echo. The rain echo can thus be suppressed to give a truer target signal.
    Type: Grant
    Filed: June 9, 1987
    Date of Patent: November 14, 1989
    Assignee: Licentia Patent-Verwaltungs-GmbH
    Inventors: Franz Jehle, Martin Konig, Erwin Wolfle
  • Patent number: 4868917
    Abstract: A radar apparatus transmits right circular polarized signals and selects the right circular polarized components of the corresponding returns. It also transmits left circular polarized signals and selects the left circular polarized components of the corresponding returns. The selected left and right circular polarized compoments are processed by, for example, averaging them, producing a weighted average of them, or selecting the component of larger value.
    Type: Grant
    Filed: March 7, 1980
    Date of Patent: September 19, 1989
    Assignee: E M I Limited
    Inventor: Sydney C. Woolcock
  • Patent number: 4811020
    Abstract: The radar is designed to identify and then eliminate rain clutter signals. For this, the radar works in circular polarization with alternately identical and opposite polarization directions at transmission and reception, from one recurrence to the next one. The signals are identified by a comparator which compares the sigma video signals relating to the same distance quanta for two successive recurrences, the identifying criterion being a major difference in the level of the signals compared, for rain clutter signals, and little difference for useful echo signals. A switch controlled by the comparator eliminates the parasite signals.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: March 7, 1989
    Assignee: Thomson-CSF
    Inventor: Jean C. Montheil
  • Patent number: 4742354
    Abstract: A radar transceiver is disclosed which operates with circularly polarized waveforms. A single circularly polarized antenna is used to transmit and receive circularly polarized waveforms. A 3-dB directional coupler splits the signal to be transmitted into two signals 90.degree. out-of-phase for transmission by the antenna and also combines the horizontal and vertical components of any return signal.
    Type: Grant
    Filed: August 8, 1986
    Date of Patent: May 3, 1988
    Assignee: Hughes Aircraft Company
    Inventors: Cheng P. Wen, Trang N. Trinh
  • Patent number: 4737793
    Abstract: A controllable dual input/output port power divider coupled with a controllable phase shifter feed a dual ported dual polarized microstrip antenna structure. By controlling the power divider and phase shifter, arbitrary orthogonal polarization (e.g., linear, circular or elliptical) radiated r.f. fields are obtained. Virtually the entire structure comprising the dual port power divider, phase shifter and microstrip radiator may be formed of shaped photo-chemically etched microstrip conductors disposed a very short distance (e.g., less than one-tenth wavelength) above a conductive reference surface.
    Type: Grant
    Filed: October 28, 1983
    Date of Patent: April 12, 1988
    Assignee: Ball Corporation
    Inventors: Robert E. Munson, Ippalapalli Sreenivasiah
  • Patent number: 4691205
    Abstract: A reduced size and weight beam forming network for a circularly polarized N element array antenna system is achieved by interconnecting quadrature couplers without intermediate phase shifters and adding twisted waveguide phase shifters at the coupler outputs to equalize the phase at the array elements.
    Type: Grant
    Filed: June 6, 1985
    Date of Patent: September 1, 1987
    Assignee: RCA Corporation
    Inventor: Charles E. Profera, Jr.
  • Patent number: 4630057
    Abstract: A leaky-feeder or other form of guided radiocommunication system serving a linear route or track is equipped at intervals with static marker devices which successively modify a radio signal passing those points between a fixed base station and a personal or mobile station travelling the route. By reference to the resulting overall modification to the signal as received at the mobile or fixed station the position of the mobile station may be determined or delimited.
    Type: Grant
    Filed: September 25, 1984
    Date of Patent: December 16, 1986
    Assignee: Coal Industry (Patents) Limited
    Inventor: David J. R. Martin