Patents by Inventor Carson R. White
Carson R. White 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: 10340889Abstract: A method of and an apparatus for reducing noise in a non-Foster circuit having at least a pair of cross coupled transistor devices, each transistor device of the pair of cross coupled transistor devices having a pair of current carrying electrodes. The method and apparatus involves coupling inductors with each pair of the current carrying electrodes of each of the cross-coupled transistor devices in the non-Foster circuit, the inductors also being coupled with voltage and/or current sources associated with or coupled to the non-Foster circuit. The nominal values of the inductors are selected to provide a load asymmetry, so that the load inductor in the input side of the non-Foster circuit has a larger inductance than the load inductor at the output side of non-Foster circuit.Type: GrantFiled: September 23, 2016Date of Patent: July 2, 2019Assignee: HRL Laboratories, LLCInventors: Zhiwei A. Xu, Carson R. White, Jonathan J. Lynch
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Publication number: 20180212319Abstract: In examples, systems and methods for increasing the performance of electrically-small antennas are described. An example system comprises an electrically-small antenna having an antenna feed. The electrically-small antenna is configured to receive a signal. The system also comprises a non-foster circuit having a negative capacitance coupled to the antenna feed in a shunt position. The non-foster circuit is configured to resonate the electrically-small antenna and provide a voltage increase to the received signal. The system also comprises a buffer circuit configured to provide an impedance conversion of the voltage-increased received signal between the antenna feed and an output of the buffer circuit. The buffer circuit includes a field-effect transistor.Type: ApplicationFiled: January 20, 2017Publication date: July 26, 2018Inventors: Carson R. White, Walter S. Wall, JR.
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Publication number: 20180198211Abstract: An antenna system having at least one active element with a first end thereof for connection to a radio receiver, transmitter or transceiver and at least one electromechanical resonator connected in series with (i) at least portion of said at least one active element and at least another portion of said at least one active element or (ii) said at least one active element and said radio receiver, transmitter or transceiver. The at least one active element exhibits capacitive reactance at an intended frequency of operation and the at least one electromechanical resonator exhibits inductive reactance at the intended frequency of operation, the inductive reactance of the at least one electromechanical resonator offsetting or partially offsetting the capacitive reactance of the at least one antenna element at the intended frequency of operation.Type: ApplicationFiled: June 29, 2017Publication date: July 12, 2018Applicant: HRL Laboratories, LLCInventors: Walter S. WALL, Hyok J. SONG, Randall L. KUBENA, Carson R. WHITE
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Patent number: 9954284Abstract: A dielectric artificial impedance surface antenna (DAISA) including a first dielectric with a thickness, the first dielectric thickness varying to provide a modulated impedance to a signal traversing the first dielectric, the first dielectric having a first surface and a second surface opposite the first surface, and a transparent conductive material coating the second surface.Type: GrantFiled: June 28, 2013Date of Patent: April 24, 2018Assignee: HRL Laboratories, LLCInventors: Carson R. White, Daniel J. Gregoire
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Patent number: 9923548Abstract: A switched mode negative inductance circuit includes an input node responsive to a voltage signal. The circuit also includes first and second voltage sources, first and second controlled switches having first poles coupled to the first and second voltage sources, respectively and an inductor having a first electrode coupled to second poles of the first and second controlled switches and a second electrode coupled to the input node. The input node is coupled to a control electrode of the first controlled switch, and to a control electrode of the second controlled switch through a voltage inverting circuit. The disclosure also illustrates balanced negative inductance circuits and implementation approaches using NMOS transistors.Type: GrantFiled: April 13, 2016Date of Patent: March 20, 2018Assignee: HRL Laboratories, LLCInventors: Carson R. White, Brian Hughes
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Patent number: 9705201Abstract: An active artificial magnetic conductor includes an array of unit cells, each unit cell including a top face, at least one wall coupled to the top face, a base coupled to the at least one wall, and a crossed slot in the top face. The top face, the at least one wall, and the base form a cavity and are conductive.Type: GrantFiled: February 20, 2015Date of Patent: July 11, 2017Assignee: HRL Laboratories, LLCInventors: Carson R. White, Daniel J. Gregoire
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Patent number: 9557585Abstract: A phased array that comprises a predetermined number of emitter/receiver elements; said emitter/receiver elements being arranged on a array formed of stacked rows, wherein the emitter/receiver elements in each row of the array are distributed according to a pseudo-random pattern; and the heights of the rows vary according to a pseudo-random pattern.Type: GrantFiled: May 30, 2014Date of Patent: January 31, 2017Assignee: HRL Laboratories, LLCInventors: Daniel Yap, Kevin Geary, Carson R. White
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Patent number: 9425769Abstract: This invention is the Optically Powered and Controlled Non-Foster Circuit (OPCNFC) that is electrically floating; i.e., it does not have any metallic electrical/conductive connection to a power supply, ground, or control signal. Rather power and control signals are applied to the OPCNFC using optical energy. The Non-Foster Circuit (NFC) synthesizes negative inductance, negative capacitance, and/or negative resistance between metallic patches disposed in an array of an Artificial Impedance Surface (AIS).Type: GrantFiled: July 18, 2014Date of Patent: August 23, 2016Assignee: HRL Laboratories, LLCInventors: Carson R. White, James H. Schaffner
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Patent number: 9407239Abstract: An automatic tuning circuit for matching an antenna to a radio receiver. The automatic tuning circuit includes a tunable non-Foster circuit for coupling the receiver and the antenna; and sensing and feedback circuits for sensing the combined capacitance of the tunable non-Foster circuit and the antenna and for tuning the tunable non-Foster circuit to automatically minimize the combined capacitance of the tunable non-Foster circuit and the antenna.Type: GrantFiled: May 15, 2012Date of Patent: August 2, 2016Assignee: HRL Laboratories, LLCInventors: Carson R. White, Joseph S. Colburn, Michael W. Yung, Donald A. Hitko
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Patent number: 9379448Abstract: An active artificial magnetic conductor includes a ground plane and an array of unit cells coupled to the ground plane. Each unit cell includes a low impedance shunt coupled to the ground plane and an impedance element coupled to the low impedance shunt. A plurality of non Foster circuits are coupled in two different directions between impedance elements of adjacent neighboring unit cells in the array of unit cells.Type: GrantFiled: February 24, 2014Date of Patent: June 28, 2016Assignee: HRL Laboratories, LLCInventors: Daniel J. Gregoire, Carson R. White
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Patent number: 9276554Abstract: A four port antenna decoupling network which has only two negative capacitors and four or more positive capacitors and a method of improving low frequency receiving performance of two element and four element antenna arrays using one or more wideband decoupling circuits wherein each of said wideband decoupling circuits contain a maximum of two non-Foster components, the two non-Foster components preferably simulating negative capacitors.Type: GrantFiled: April 3, 2013Date of Patent: March 1, 2016Assignee: HRL Laboratories, LLCInventors: Jonathan J. Lynch, Carson R. White
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Patent number: 9214724Abstract: An antenna array containing two or more radiating elements, with nearest neighbor radiating elements connected together with a non-Foster circuit at terminals of the radiating elements such that mutual reactance of the elements is reduced over a wider bandwidth than which would be obtained if the non-Foster circuits were omitted.Type: GrantFiled: April 3, 2013Date of Patent: December 15, 2015Assignee: HRL Laboratories, LLCInventors: Carson R. White, Jonathan J. Lynch
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Publication number: 20150263432Abstract: An active artificial magnetic conductor includes an array of unit cells, each unit cell including a top face, at least one wall coupled to the top face, a base coupled to the at least one wall, and a crossed slot in the top face. The top face, the at least one wall, and the base form a cavity and are conductive.Type: ApplicationFiled: February 20, 2015Publication date: September 17, 2015Applicant: HRL LABORATORIES LLCInventors: Carson R. WHITE, Daniel J. Gregoire
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Publication number: 20150244079Abstract: An active artificial magnetic conductor includes an array of unit cells, each unit cell including a top face, at least one wall coupled to the top face, a base coupled to the at least one wall, and a crossed slot in the top face. The top face, the at least one wall, and the base form a cavity and are conductive.Type: ApplicationFiled: February 24, 2014Publication date: August 27, 2015Applicant: HRL LABORATORIES, LLC.Inventors: Carson R. White, Daniel J. Gregoire
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Publication number: 20150244080Abstract: An active artificial magnetic conductor includes a ground plane and an array of unit cells coupled to the ground plane. Each unit cell includes a low impedance shunt coupled to the ground plane and an impedance element coupled to the low impedance shunt. A plurality of non Foster circuits are coupled in two different directions between impedance elements of adjacent neighboring unit cells in the array of unit cells.Type: ApplicationFiled: February 24, 2014Publication date: August 27, 2015Applicant: HRL LABORATORIES, LLC.Inventors: Daniel J. Gregoire, Carson R. White
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Patent number: 9077072Abstract: Antenna systems and antenna filters are provided, for example for use in a windshield or on a roof of a vehicle. An antenna system comprises a first antenna, a second antenna, and a filter. The first antenna is configured to operate at a first frequency. The second antenna is configured to operate at a second frequency. The filter is coupled to the first antenna. The filter is configured to create an open circuit condition at the second frequency and reduce secondary radiation between the first and second antennas.Type: GrantFiled: September 20, 2010Date of Patent: July 7, 2015Assignee: GENERAL MOTORS LLCInventors: Hyok Jae Song, Carson R. White, Yoon Yeong, Eray Yasan
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Patent number: 9054798Abstract: A method of and circuit for improving stabilization of a non-Foster circuit. The method comprises steps of and the circuit includes means for measuring a noise hump power at an antenna port or an output port of the non-Foster circuit, comparing the measured noise hump power with a desired level of noise power that corresponds to a desired operating state of the non-Foster circuit, and tuning the non-Foster circuit to generate the desired level of noise power to achieve the desired operating state of the non-Foster circuit.Type: GrantFiled: July 5, 2012Date of Patent: June 9, 2015Assignee: HRL Laboratories, LLCInventors: Zhiwei Xu, Michael W. Yung, Donald A. Hitko, Carson R. White
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Patent number: 8988173Abstract: A differential circuit topology that produces a tunable floating negative inductance, negative capacitance, negative resistance/conductance, or a combination of the three. These circuits are commonly referred to as “non-Foster circuits.” The disclosed embodiments of the circuits comprises two differential pairs of transistors that are cross-coupled, a load immittance, multiple current sources, two Common-Mode FeedBack (CMFB) networks, at least one tunable (variable) resistance, and two terminals across which the desired immittance is present. The disclosed embodiments of the circuits may be configured as either a Negative Impedance Inverter (NII) or a Negative Impedance Converter (NIC) and as either Open-Circuit-Stable (OCS) and Short-Circuit-Stable (SCS).Type: GrantFiled: April 6, 2012Date of Patent: March 24, 2015Assignee: HRL Laboratories, LLCInventors: Donald A. Hitko, Carson R. White, Michael W. Yung, David S. Matthews, Susan L. Morton, Jason W. May, Joseph S. Colburn
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Patent number: 8976077Abstract: A tunable impedance surface, the tunable surface including a plurality of elements disposed in a two dimensional array; and an arrangement of variable negative reactance circuits for controllably varying negative reactance between at least selected ones of adjacent elements in the aforementioned two dimensional array.Type: GrantFiled: April 6, 2012Date of Patent: March 10, 2015Assignee: HRL Laboratories, LLCInventors: Joseph S. Colburn, Carson R. White, Daniel J. Gregoire
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Patent number: 8957831Abstract: In one embodiment an artificial magnetic conductor assembly to reflect an electromagnetic signal with a phase shift that measures between ?90 degrees and +90 degrees at a target frequency comprises a first ground plane, a plurality of metallic elements disposed at a first distance from the first ground plane, a plurality of capacitors coupling adjacent metallic elements of the plurality of metallic elements, and a dielectric substrate disposed between the first ground plane and the array of metallic elements and formed from a material having a relative permittivity that measures between 1 and 20.Type: GrantFiled: March 30, 2010Date of Patent: February 17, 2015Assignee: The Boeing CompanyInventors: Daniel J. Gregoire, Carson R. White