Patents by Inventor Timothy Sleasman
Timothy Sleasman 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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Patent number: 11916291Abstract: 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.Type: GrantFiled: June 6, 2023Date of Patent: February 27, 2024Assignee: Duke UniversityInventors: Michael Boyarsky, Timothy Sleasman, Jonah Gollub, Seyedmohammadreza Faghih Imani, David R. Smith
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Patent number: 11855342Abstract: 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.Type: GrantFiled: November 14, 2022Date of Patent: December 26, 2023Assignee: Duke UniversityInventors: Insang Yoo, Seyedmohammadreza Faghih Imani, Timothy Sleasman, David R. Smith
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Publication number: 20230352843Abstract: 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.Type: ApplicationFiled: June 6, 2023Publication date: November 2, 2023Inventors: Michael Boyarsky, Timothy Sleasman, Jonah Gollub, Seyedmohammadreza Faghih Imani, David R. Smith
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Patent number: 11670861Abstract: 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.Type: GrantFiled: November 25, 2020Date of Patent: June 6, 2023Assignee: Duke UniversityInventors: Michael Boyarsky, Timothy Sleasman, Jonah Gollub, Seyedmohammadreza Faghih Imani, David R. Smith
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Publication number: 20230143134Abstract: 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.Type: ApplicationFiled: November 14, 2022Publication date: May 11, 2023Inventors: Insang Yoo, Seyedmohammadreza Faghih Imani, Timothy Sleasman, David R. Smith
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Patent number: 11598866Abstract: 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.Type: GrantFiled: June 10, 2019Date of Patent: March 7, 2023Assignee: Duke UniversityInventors: Timothy Sleasman, Laura Pulido Mancera, Jonah Gollub, Michael Boyarsky, Thomas Fromenteze, Seyedmohammadreza Faghih Imani, David R. Smith
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Publication number: 20220399651Abstract: A method for constructing a multifunctional antenna structure configured to generate a plurality of radiation patterns includes determining a desired source field associated with the plurality of radiation patterns, and receiving feed locations for a waveguide to an antenna aperture surface. The method may further include placing a metasurface resonator at a first resonator location that exhibits a minimum error relative to the desired source field and satisfies a maximum error threshold relative to the desired source field. The metasurface resonator may be determined based on the feed locations and a plurality of degrees of freedom for the first resonator location. The method may also include discarding a second resonator location in response to determining that no metasurface resonator at the second resonator location satisfies the maximum error threshold. The plurality of degrees of freedom may include metasurface resonator geometries that exhibit different polarizabilities defined in a candidate library.Type: ApplicationFiled: September 3, 2021Publication date: December 15, 2022Inventors: Timothy A. Sleasman, David B. Shrekenhamer, Paul A. Vichot, Stephanie D. Lashley
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Patent number: 11502396Abstract: 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.Type: GrantFiled: February 19, 2021Date of Patent: November 15, 2022Inventors: Insang Yoo, Seyedmohammadreza Faghih Imani, Timothy Sleasman, David R. Smith
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Publication number: 20220257266Abstract: An intracranial access device includes a housing having an operator-facing side and a patient-facing side and an opening therethrough extending from the operator-facing side to the patient-facing side. The device further includes at least one fastener configured to secure the device to a cranium of a patient. The device further includes a drill mounted to a surface of the housing and a cauterizer. The device may further include a number of sensors arranged on the patient-facing side of the housing and configured to identify a hemorrhage location.Type: ApplicationFiled: July 16, 2020Publication date: August 18, 2022Applicants: The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., The Johns Hopkins UniversityInventors: David L. Brody, David Blodgett, Carissa Rodriguez, Timothy Sleasman, Michael J. Fitch, Adam Cohen, Max R. Basescu, Kevin C. Wolfe, Jared M. Wormley
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Patent number: 11349222Abstract: 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.Type: GrantFiled: September 21, 2018Date of Patent: May 31, 2022Assignee: Duke UniversityInventors: Seyedmohammadreza Faghih Imani, Timothy Sleasman, Jonah Gollub, David Smith
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Patent number: 11289817Abstract: A reconfigurable reflectarray antenna (RAA) system includes a reconfigurable RAA and a controller. The RAA includes a metasurface having a dynamically tunable electromagnetic characteristic and is configured to receive a signal of opportunity. The signal of opportunity is generated separately and independently from the reconfigurable RAA system. The controller is in signal communication with the reconfigurable RAA and is configured to generate a control signal configured to dynamically tune the electromagnetic characteristic of the metasurface. The electromagnetic characteristic includes a reflection phase, which when varied, dynamically beam steers the signal of opportunity reflected from the metasurface.Type: GrantFiled: May 1, 2020Date of Patent: March 29, 2022Assignee: The Johns Hopkins UniversityInventors: Oscar F. Somerlock, III, Robert L. Schmid, David B. Shrekenhamer, Amanda C. Malone, Timothy A. Sleasman, Ra'id S. Awadallah
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Publication number: 20210234263Abstract: 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.Type: ApplicationFiled: February 19, 2021Publication date: July 29, 2021Inventors: Insang Yoo, Seyedmohammadreza Faghih Imani, Timothy Sleasman, David R. Smith
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Publication number: 20210175630Abstract: 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.Type: ApplicationFiled: November 25, 2020Publication date: June 10, 2021Inventors: Michael Boyarsky, Timothy Sleasman, Jonah Gollub, Seyedmohammadreza Faghih Imani, David R. Smith
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Patent number: 10931004Abstract: 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.Type: GrantFiled: September 21, 2018Date of Patent: February 23, 2021Assignee: Duke UniversityInventors: Insang Yoo, Seyedmohammadreza Faghih Imani, Timothy Sleasman, David R. Smith
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Publication number: 20200350691Abstract: A reconfigurable reflectarray antenna (RAA) system includes a reconfigurable RAA and a controller. The RAA includes a metasurface having a dynamically tunable electromagnetic characteristic and is configured to receive a signal of opportunity. The signal of opportunity is generated separately and independently from the reconfigurable RAA system. The controller is in signal communication with the reconfigurable RAA and is configured to generate a control signal configured to dynamically tune the electromagnetic characteristic of the metasurface. The electromagnetic characteristic includes a reflection phase, which when varied, dynamically beam steers the signal of opportunity reflected from the metasurface.Type: ApplicationFiled: May 1, 2020Publication date: November 5, 2020Inventors: Oscar F. Somerlock, III, Robert L. Schmid, David B. Shrekenhamer, Amanda C. Malone, Timothy A. Sleasman, Ra'id S. Awadallah
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Publication number: 20200028270Abstract: 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.Type: ApplicationFiled: September 21, 2018Publication date: January 23, 2020Inventors: Seyedmohammadreza Faghih Imani, Timothy Sleasman, Jonah Gollub, David Smith
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Publication number: 20190377084Abstract: 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.Type: ApplicationFiled: June 10, 2019Publication date: December 12, 2019Inventors: Timothy Sleasman, Laura Pulido Mancera, Jonah Gollub, Michael Boyarsky, Thomas Fromenteze, Seyedmohammadreza Faghih Imani, David R. Smith
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Publication number: 20190346545Abstract: 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.Type: ApplicationFiled: December 12, 2017Publication date: November 14, 2019Inventors: Timothy SLEASMAN, Laura Pulido MANCERA, Jonah GOLLUB, Michael BOYARSKY, Thomas FROMENTEZE, Seyedmohammadreza Faghih IMANI, David R. SMITH
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Publication number: 20190103665Abstract: 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.Type: ApplicationFiled: September 21, 2018Publication date: April 4, 2019Inventors: Insang Yoo, Seyedmohammadreza Faghih Imani, Timothy Sleasman, David R. Smith
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Publication number: 20190094408Abstract: 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.Type: ApplicationFiled: September 21, 2018Publication date: March 28, 2019Inventors: Michael Boyarsky, Seyedmohammadreza Faghih Imani, Daniel L. Marks, Timothy Sleasman, David R. Smith, Okan Yurduseven