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公开(公告)号：US11598866B2
公开(公告)日：2023-03-07
申请号：US16436037
申请日：2019-06-10
申请人： Duke University
发明人： Timothy Sleasman , Laura Pulido Mancera , Jonah Gollub , Michael Boyarsky , Thomas Fromenteze , Seyedmohammadreza Faghih Imani , David R. Smith
IPC分类号： G01S13/42 , G01S7/03 , G01S7/35 , G01S13/36 , G01S13/88 , G01S13/89 , H01Q3/26 , G01S13/34 , H01Q21/00 , G01S7/02
摘要： A single frequency, or very narrow frequency band, microwave imaging system is described herein. A microwave imaging system can include an array transmitter; an array receiver; and a computing device that receives signals detected from the array receiver, transforms the signals received by the array receiver into independent spatial measurements, constructs an image using the independent spatial measurements, and outputs a reconstructed image. The array transmitter and the array receiver may each have a plurality of independently controllable metasurface resonant elements.
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2.发明申请公开(公告)号：US20190103665A1
公开(公告)日：2019-04-04
申请号：US16138783
申请日：2018-09-21
申请人： Duke University
摘要： A MIMO communication system is provided. The system may include a first antenna comprising a first cavity, a first plurality of RF ports for generating a feed wave within the first cavity, and a first plurality of sub-wavelength artificially structured material elements as arranged on a surface of the first cavity as RF radiators. The first antenna is configured to generate a plurality of radiation patterns respectively corresponding to the first plurality of ports. The system may also include a second antenna comprising a second cavity and a second plurality of sub-wavelength artificially structured material elements arranged on a surface of the second cavity.
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3.发明公开公开(公告)号：US20230143134A1
公开(公告)日：2023-05-11
申请号：US17986664
申请日：2022-11-14
申请人： Duke University
IPC分类号： H01Q1/36 , H01Q5/30 , H01Q21/00 , H04B7/0413 , H01Q21/06 , H01Q1/52 , H01Q15/00 , H01Q21/28 , H01Q25/00
CPC分类号： H01Q1/364 , H01Q5/30 , H01Q21/0025 , H04B7/0413 , H01Q21/062 , H01Q1/523 , H01Q15/0086 , H01Q21/28 , H01Q25/00 , H04B7/0617
摘要： A MIMO communication system is provided. The system may include a first antenna comprising a first cavity, a first plurality of RF ports for generating a feed wave within the first cavity, and a first plurality of sub-wavelength artificially structured material elements as arranged on a surface of the first cavity as RF radiators. The first antenna is configured to generate a plurality of radiation patterns respectively corresponding to the first plurality of ports. The system may also include a second antenna comprising a second cavity and a second plurality of sub-wavelength artificially structured material elements arranged on a surface of the second cavity.
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公开(公告)号：US11349222B2
公开(公告)日：2022-05-31
申请号：US16138552
申请日：2018-09-21
申请人： Duke University
摘要： The present disclosure provides systems and methods relating to sensing the presence of a lifeform. In particular, the present disclosure provides systems and methods for detecting the presence of a lifeform in a building or room using dynamic metasurface aperture (DMA), which overcome many limitations of currently available radio frequency (RF) or infrared (IR)-based systems.
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公开(公告)号：US11990681B2
公开(公告)日：2024-05-21
申请号：US18142408
申请日：2023-05-02
申请人： DUKE UNIVERSITY
CPC分类号： H01Q21/0037 , H01Q13/20
摘要： An apparatus includes a traveling-wave antenna array comprising a plurality of adjacent metamaterial surface antennas comprising a waveguide or a cavity, each adjacent metamaterial surface antenna comprising an array of metamaterial radiators coupled to a surface of the waveguide or the cavity, each metamaterial radiator comprising an individually addressable tunable component that can be tuned over a spectral bandwidth to generate different radiation patterns. The apparatus further includes a phase diversity feed coupled to the traveling-wave antenna array and configured to provide adjustable phase diverse input to two or more of the plurality of adjacent metamaterial surface antennas, the phase diverse input comprising a first phase for a first traveling-wave antenna and a second phase for a second traveling-wave antenna, the first phase being different from the second phase, wherein the phase diverse input is-selected to suppress grating lobes for a directed beam pattern selected for transmission.
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公开(公告)号：US11916291B2
公开(公告)日：2024-02-27
申请号：US18206522
申请日：2023-06-06
申请人： DUKE UNIVERSITY
发明人： Michael Boyarsky , Timothy Sleasman , Jonah Gollub , Seyedmohammadreza Faghih Imani , David R. Smith
摘要： According to various embodiments, systems and methods for spatial sampling in proximity to the Nyquist limit in traveling-wave antenna systems are disclosed. An apparatus can include a traveling-wave antenna array comprising a plurality of adjacent traveling-wave antennas that each include a plurality of tunable elements that are spaced at, near, or above a Nyquist limit spacing to form an array of tunable elements. The apparatus also includes a phase diversity feed coupled to the traveling-wave antenna array that is configured to provide input to the traveling-wave antenna array including phase diverse input to two or more of the plurality of adjacent traveling-wave antennas. Further, the apparatus includes a plurality of grayscale tuning elements configured to tune the plurality of tunable elements along one or more ranges of one or more tuning variables to form one or more specific output radiation patterns through the traveling-wave antenna array based on the input.
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公开(公告)号：US11670867B2
公开(公告)日：2023-06-06
申请号：US17102310
申请日：2020-11-23
申请人： Duke University
CPC分类号： H01Q21/0037 , H01Q13/20
摘要： According to various embodiments, systems and methods for suppressing grating lobes in a traveling-wave antenna system are disclosed. An apparatus can include a traveling-wave antenna array comprising a plurality of adjacent traveling-wave antennas. The apparatus also can include a phase diversity feed coupled to the traveling-wave antenna array. The phase diversity feed can be configured to provide phase diverse input to two or more of the plurality of adjacent traveling-wave antennas.
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公开(公告)号：US20190094408A1
公开(公告)日：2019-03-28
申请号：US16138798
申请日：2018-09-21
申请人： Duke University
发明人： Michael Boyarsky , Seyedmohammadreza Faghih Imani , Daniel L. Marks , Timothy Sleasman , David R. Smith , Okan Yurduseven
摘要： According to various embodiments, systems and methods for through imaging a medium are disclosed. An apparatus can include one or more radiating elements comprising one or more artificially-structured materials. The one or more radiating elements can be configured to transmit a radiation pattern of electromagnetic energy into a medium. The apparatus also can include one or more receiving elements configured to receive backscattered energy from the radiation pattern of electromagnetic energy transmitted into the medium. The backscattered energy received by the one or more receiving elements can be used to generate one or more through images of the medium.
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9.发明授权公开(公告)号：US11855342B2
公开(公告)日：2023-12-26
申请号：US17986664
申请日：2022-11-14
申请人： Duke University
IPC分类号： H01Q1/36 , H01Q5/30 , H01Q21/00 , H04B7/0413 , H01Q21/06 , H01Q1/52 , H01Q15/00 , H01Q21/28 , H01Q25/00 , H04B7/06 , H04B7/08 , H04B7/10
CPC分类号： H01Q1/364 , H01Q1/523 , H01Q5/30 , H01Q15/0086 , H01Q21/0025 , H01Q21/062 , H01Q21/28 , H01Q25/00 , H04B7/0413 , H04B7/0617 , H04B7/0837 , H04B7/10
摘要： A MIMO communication system is provided. The system may include a first antenna comprising a first cavity, a first plurality of RF ports for generating a feed wave within the first cavity, and a first plurality of sub-wavelength artificially structured material elements as arranged on a surface of the first cavity as RF radiators. The first antenna is configured to generate a plurality of radiation patterns respectively corresponding to the first plurality of ports. The system may also include a second antenna comprising a second cavity and a second plurality of sub-wavelength artificially structured material elements arranged on a surface of the second cavity.
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10.发明授权公开(公告)号：US11502396B2
公开(公告)日：2022-11-15
申请号：US17180536
申请日：2021-02-19
申请人： Duke University
IPC分类号： H01Q1/36 , H01Q5/30 , H01Q21/00 , H04B7/0413 , H01Q21/06 , H01Q1/52 , H01Q15/00 , H01Q21/28 , H01Q25/00 , H04B7/06 , H04B7/08 , H04B7/10
摘要： A MIMO communication system is provided. The system may include a first antenna comprising a first cavity, a first plurality of RF ports for generating a feed wave within the first cavity, and a first plurality of sub-wavelength artificially structured material elements as arranged on a surface of the first cavity as RF radiators. The first antenna is configured to generate a plurality of radiation patterns respectively corresponding to the first plurality of ports. The system may also include a second antenna comprising a second cavity and a second plurality of sub-wavelength artificially structured material elements arranged on a surface of the second cavity.
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