Abstract: In an aspect, the disclosed technology relates to embodiments of a lossy ferrite-core and dielectric-shell (LFC-DS) structure in an axial-mode helical antenna (AM-HA) or a meandered dipole antennas. The instant topology can be used to facilitates the broader use of ferrite materials, including lossy ferrite material, for a miniature AM-HA or meandered dipole antennas, e.g., by overcoming the lossy characteristics of the lossy ferrite. The resulting miniature AM-HA can be used for high frequency operation, including at over 1 GHz, making the instant topology suitable for very high frequency (VHF) and ultra-high Frequency (UHF) applications.

Abstract: Various implementations include a six-phase electric motor including an annular stator and a rotor. The stator defines an opening having an inner surface. First and second three-phase sets of concentrated windings are circumferentially spaced along the inner surface of the opening. The first and second sets of concentrated windings are circumferentially offset from each other. The stator defines voids located radially outwardly from, and circumferentially between, each of the windings. The rotor includes permanent magnets circumferentially spaced around the rotor axis. The outer circumferential surface of the rotor defines grooves located circumferentially between each of the permanent magnets. The rotor is disposed within the stator opening such that the stator and rotor are coincident with each other. Flux from the permanent magnets interacts with a stator magnetic field created by a current flowing through the first and second sets of concentrated windings to cause the rotor to rotate.

Abstract: Various implementations include an electric motor including an annular radial stator, an annular axial stator, and a rotor. The annular radial stator has an opening with an inner surface and distributed windings disposed along at least the inner surface of the opening. The annular axial stator has concentrated windings disposed along at least a first side of the axial stator. The rotor includes two or more magnets. Flux from the two or more magnets interacts with one or both of a magnetic field created by the radial stator windings or axial rotor windings. The rotor is disposed within the radial stator opening and the axes of the axial stator and radial stator are coincident with the rotor axis. The flux interacting with one or both of the radial stator magnetic field or the axial stator magnetic field turns the rotor about the rotor axis.

Abstract: Described and disclosed herein is a wideband polarized patch antenna and the antenna array that can cover mmWave frequency band from 24.3 to 29.6 GHz for 5G applications, and a feeding structure for such an antenna comprising a single element of a polarized helical-shaped L-probe fed patch antenna (HLF-PA) package.

Abstract: Various implementations include a spoke-type rotor design that exhibits low torque ripple with competitive torque density. The rotor includes a rotor core, rotor core (RC) magnets, nonmagnetic caps disposed on an outer radial end of each RC magnet, and flux directing (FD) magnets disposed circumferentially between adjacent RC magnets. Each nonmagnetic cap has a radially tapered shape (e.g., trapezoidal). An outer radial end of each cap and an outer radial end of each RC magnet opening define an air gap therebetween. The magnetic flux directions of the RC magnets are circumferentially directed clockwise or counterclockwise, and the flux directions of circumferentially adjacent RC magnets are opposite from each other. The magnetic flux directions of the FD magnets are directed radially inwardly or outwardly, and the flux directions of circumferentially adjacent FD magnets are opposite from each other. The RC and/or FD magnets may include rare-earth free materials.

Abstract: A direction-finding system is disclosed. The receiving system includes a channel sounder using a Pseudo-Doppler Antenna Array (PDAA) configured to locate transmitters and to sound the channel at pre-defined operating frequency.

Abstract: In an aspect, the disclosed technology relates to embodiments of a lossy ferrite-core and dielectric-shell (LFC-DS) structure in an axial-mode helical antenna (AM-HA) or a meandered dipole antennas. The instant topology can be used to facilitates the broader use of ferrite materials, including lossy ferrite material, for a miniature AM-HA or meandered dipole antennas, e.g., by overcoming the lossy characteristics of the lossy ferrite. The resulting miniature AM-HA can be used for high frequency operation, including at over 1 GHz, making the instant topology suitable for very high frequency (VHF) and ultra-high Frequency (UHF) applications.

Abstract: Various implementations include an electric motor including an annular radial stator, an annular axial stator, and a rotor. The annular radial stator has an opening with an inner surface and distributed windings disposed along at least the inner surface of the opening. The annular axial stator has concentrated windings disposed along at least a first side of the axial stator. The rotor includes two or more magnets. Flux from the two or more magnets interacts with one or both of a magnetic field created by the radial stator windings or axial rotor windings. The rotor is disposed within the radial stator opening and the axes of the axial stator and radial stator are coincident with the rotor axis. The flux interacting with one or both of the radial stator magnetic field or the axial stator magnetic field turns the rotor about the rotor axis.

Abstract: Described and disclosed herein is a wideband polarized patch antenna and the antenna array that can cover mmWave frequency band from 24.3 to 29.6 GHz for 5G applications, and a feeding structure for such an antenna comprising a single element of a polarized helical-shaped L-probe fed patch antenna (HLF-PA) package.

Abstract: Described herein is an approximate dynamic programming (ADP) vector controller for control of a permanent magnet (PM) motor. The ADP controller is developed using the full dynamic equation of a PM motor and implemented using an artificial neural network (ANN). A feedforward control strategy is integrated with the ANN-based ADP controller to enhance the stability and transient performance of the ADP controller in both linear and over modulation regions. Simulation and hardware experiments demonstrate that the proposed ANN-based ADP controller can track large reference changes with high efficiency and reliability for PM motor operation in linear and over modulation regions.

Abstract: Various implementations include a spoke-type rotor design that exhibits low torque ripple with competitive torque density. The rotor includes a rotor core, rotor core (RC) magnets, nonmagnetic caps disposed on an outer radial end of each RC magnet, and flux directing (FD) magnets disposed circumferentially between adjacent RC magnets. Each nonmagnetic cap has a radially tapered shape (e.g., trapezoidal). An outer radial end of each cap and an outer radial end of each RC magnet opening define an air gap therebetween. The magnetic flux directions of the RC magnets are circumferentially directed clockwise or counterclockwise, and the flux directions of circumferentially adjacent RC magnets are opposite from each other. The magnetic flux directions of the FD magnets are directed radially inwardly or outwardly, and the flux directions of circumferentially adjacent FD magnets are opposite from each other. The RC and/or FD magnets may include rare-earth free materials.

Abstract: Described herein is an approximate dynamic programming (ADP) vector controller for control of a permanent magnet (PM) motor. The ADP controller is developed using the full dynamic equation of a PM motor and implemented using an artificial neural network (ANN). A feedforward control strategy is integrated with the ANN-based ADP controller to enhance the stability and transient performance of the ADP controller in both linear and over modulation regions. Simulation and hardware experiments demonstrate that the proposed ANN-based ADP controller can track large reference changes with high efficiency and reliability for PM motor operation in linear and over modulation regions.