Patents by Inventor Guifu Zhang
Guifu Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20210159610Abstract: A microstrip patch antenna comprising: a unit cell comprising: a plurality of layers comprising: a first laminate comprising one or more horizontal polarization feed lines and one or more vertical polarization feed lines, a second laminate comprising a radiating square patch, and a third laminate comprising a parasitic patch; and a ground plane comprising one or more polarization slots. A differential feed antenna comprising: a balun; a plurality of feed lines; and one or more polarization ports configured to excite at a plurality of locations.Type: ApplicationFiled: November 10, 2020Publication date: May 27, 2021Inventors: Hadi Saeidi Manesh, Guifu Zhang
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Patent number: 10530068Abstract: A dual linear polarized dipole antenna (and arrays of such antennas) having high isolation between ports. The antenna may include a pair of crossed (collocated) bent (angled) dipole antenna elements which are excited by a unique dual-polarized feeding structure. The antenna elements may be printed. Stripline feeding along with substantially symmetrical and substantially identical radiative (e.g., “radiating”) elements results in high level of port isolation. Sub-ground planes may be positioned about the stripline on both sides of a balun block to limit or reduce parasitic stripline radiation, thereby improving polarization purity. Polarization purity may be additionally reinforced by a principal ground plane which isolates the radiative elements from the baluns. The antennas and antenna arrays may be used, for example, for weather observation and air surveillance.Type: GrantFiled: July 18, 2018Date of Patent: January 7, 2020Assignee: The Board of Regents of the University of OklahomaInventors: Mirhamed Mirmozafari, Guifu Zhang
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Publication number: 20190140364Abstract: A dual linear polarized dipole antenna (and arrays of such antennas) having high isolation between ports. The antenna may include a pair of crossed (collocated) bent (angled) dipole antenna elements which are excited by a unique dual-polarized feeding structure. The antenna elements may be printed. Stripline feeding along with substantially symmetrical and substantially identical radiative (e.g., “radiating”) elements results in high level of port isolation. Sub-ground planes may be positioned about the stripline on both sides of a balun block to limit or reduce parasitic stripline radiation, thereby improving polarization purity. Polarization purity may be additionally reinforced by a principal ground plane which isolates the radiative elements from the baluns. The antennas and antenna arrays may be used, for example, for weather observation and air surveillance.Type: ApplicationFiled: July 18, 2018Publication date: May 9, 2019Inventors: Mirhamed Mirmozafari, Guifu Zhang
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Patent number: 9778357Abstract: A method of collecting data using a polarimetric phased array antenna is described. The method includes directing electromagnetic signals to selected panels of an array of panels so as to transmit a dual H and V polarized electromagnetic beam (1) having the same beam width in all azimuth directions and (2) maintaining cross-polarization isolation via orthogonal dual-polarizations in all beam pointing directions. The panels include antennas having a horizontally (H) polarized array element and a vertically (V) polarized array element arranged to form two orthogonally polarized horizontal and vertical radiating fields which together form the dual H and V polarized electromagnetic beam. The array of panels is arranged so as to form a substantially cylindrical configuration on a support system. Reflection signals sensed by the selected panels formed by scattering of said dual H and V polarized electromagnetic beam are received and have a reflection frequency spectrum.Type: GrantFiled: March 23, 2015Date of Patent: October 3, 2017Assignee: The Board of Regents of the University of OklahomaInventors: Guifu Zhang, Robert D. Palmer, Dusan S. Zrnic, Richard J. Doviak
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Publication number: 20150192671Abstract: A method of collecting data using a polarimetric phased array antenna is described. The method includes directing electromagnetic signals to selected panels of an array of panels so as to transmit a dual H and V polarized electromagnetic beam (1) having the same beam width in all azimuth directions and (2) maintaining cross-polarization isolation via orthogonal dual-polarizations in all beam pointing directions. The panels include antennas having a horizontally (H) polarized array element and a vertically (V) polarized array element arranged to form two orthogonally polarized horizontal and vertical radiating fields which together form the dual H and V polarized electromagnetic beam. The array of panels is arranged so as to form a substantially cylindrical configuration on a support system. Reflection signals sensed by the selected panels formed by scattering of said dual H and V polarized electromagnetic beam are received and have a reflection frequency spectrum.Type: ApplicationFiled: March 23, 2015Publication date: July 9, 2015Inventors: Guifu Zhang, Robert D. Palmer, Dusan S. Zrnic, Richard J. Doviak
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Patent number: 8988274Abstract: A radar data acquisition system including a polarimetric phased array antenna and a radar control and processing system. The polarimetric phased array antenna includes a support system, an array of panels and a switching network. One or more of the panels include a dual pole antenna for at least one of transmitting and receiving a dual polarization electromagnetic beam. The switching network communicates with the panels such that at least one of power, radar and control signals are sent to and received from one or more selected panels. The radar control and processing system communicates with the switching network for forming electromagnetic signals directed to one or more selected panels such that the selected panels form a dual polarization electromagnetic beam, and for reading signals sensed by one or more selected panels and for decoding the signals into an electronic radar output.Type: GrantFiled: November 16, 2010Date of Patent: March 24, 2015Assignee: The Board of Regents of the University of OklahomaInventors: Guifu Zhang, Robert D. Palmer, Dusan S. Zmic, Richard J. Doviak
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Publication number: 20110285582Abstract: A radar data acquisition system including a polarimetric phased array antenna and a radar control and processing system. The polarimetric phased array antenna includes a support system, an array of panels and a switching network. One or more of the panels include a dual pole antenna for at least one of transmitting and receiving a dual polarization electromagnetic beam. The switching network communicates with the panels such that at least one of power, radar and control signals are sent to and received from one or more selected panels. The radar control and processing system communicates with the switching network for forming electromagnetic signals directed to one or more selected panels such that the selected panels form a dual polarization electromagnetic beam, and for reading signals sensed by one or more selected panels and for decoding the signals into an electronic radar output.Type: ApplicationFiled: November 16, 2010Publication date: November 24, 2011Inventors: Guifu Zhang, Robert D. Palmer, Dusan S. Zmic, Richard J. Dovisk
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Patent number: 6721678Abstract: A velocity determination system determines a three dimensional velocity of an object wherein the three dimensional velocity comprises a radial velocity and a transverse velocity. A velocity determination system receives a first signal from the object. The velocity determination system then receives a second signal from the object. The velocity determination system then correlates the first signal and the second signal. The velocity determination system determines the radial velocity based on a ratio of the correlation of the first signal and the second signal. The velocity determination system then determines a transverse velocity based on a ratio of the correlation of the first signal and the second signal in a forward mode and a backward mode along a transverse direction.Type: GrantFiled: December 20, 2001Date of Patent: April 13, 2004Assignee: University Corporation for Atmospheric ReserchInventors: Guifu Zhang, Jothiram Vivekanandan, Richard J. Doviak
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Patent number: 6536948Abstract: A method, software, and system determines temperature of a physical medium using remote measurements. One example of a physical medium is a cloud. A receiver receives at least one first received signal from an interaction of at least one first transmitted electromagnetic signal with the physical medium. A processing system then determines the at least one first received signal information based on the at least one first received signal. The processing system then determines the temperature of the physical medium based on the at least one first received signal information.Type: GrantFiled: August 24, 2000Date of Patent: March 25, 2003Assignee: University Corporation for Atmospheric ResearchInventors: Jothiram Vivekanandan, Guifu Zhang