Abstract: A method comprises receiving, by a radar sensor, reflections from at least two points on a body of a user. The method comprises determining, by a processor operatively coupled to the radar sensor, a change of an elevation angle and a rate of change of the elevation angle of the user with respect to the radar sensor, based on the reflections from the at least two points on the body of the user. The method comprises determining changes of a radar cross-section (RCS) associated with the body of the user along an elevation dimension. The method comprises determining whether a fall event occurred based on at least one of: the rate of change and the change of the elevation angle, or the changes of the RCS.

Abstract: An apparatus includes a microphone, a memory, and a processor operably coupled to the memory. The processor is configured to determine an energy level of an audio signal captured by the microphone and determine whether the audio signal indicates a possible fall. The processor is further configured to, upon a determination that the audio signal indicates the possible fall, poll a fall detection module.

Abstract: An electronic device includes a transceiver configured to transmit and receive ultrawide band (UWB) radar signals. The electronic device also includes a processor operatively coupled to the transceiver. The processor is configured to, based on the received UWB radar signals, detect a human within a detection area of the transceiver. The processor is further configured to perform, based on the detection of the human within the detection area of the transceiver, a motion detection operation, and perform, based on a result of the motion detection operation, a fall detection operation.

Abstract: A device includes a substrate and at least one electrically conducting portion supported by the substrate, the at least one electrically conducting portion including a signal line and a ground plane electrically isolated from the signal line. The electrically conducting portion includes a layer of a first electrically conducting material and a layer of a metal oxide material including anodic aluminum oxide (AAO) and one or more nanowires (NW) of a second electrically conducting material each formed within a corresponding pore extending through the AAO from a first side of the layer to a second side of the layer of the metal oxide material opposite the first side.

Abstract: A method includes identifying a zone blocked from line of sight (LOS) of a gNB; receiving a 3D spatial map of a first area including the zone and a second area that surrounds the zone and that is within both a coverage area and the LOS of the gNB; determining whether the second area includes a mountable surface to which a passive RF reflective metasurface is attachable; and determining whether the metasurface, if attached to the mountable surface, generates a reflection path to the zone, based on a determination that the second area includes the mountable surface and based on estimated propagation paths from the gNB to the zone. The method includes determining whether to add a metasurface to the second area based on: a determination result whether the reflection path from the metasurface attached to the mountable surface to the zone includes reflected signals satisfying a threshold bandwidth condition.

Abstract: An electronic device includes a transceiver. The transceiver is configured to transmit and receive a plurality of radar signals corresponding with a gesture. The electronic device further includes a processor operatively coupled to the transceiver. The processor is configured to obtain a range Doppler map associated with the plurality of radar signals, and determine a plurality of detection thresholds, each detection threshold corresponding with a range-bin value of the range Doppler map. The processor is further configured to generate, based on the determined plurality of detection thresholds, a time velocity diagram (TVD) and a time angle diagram (TAD) corresponding with the gesture.

Abstract: Methods and systems for human gesture recognition and activity detection using augmented data. A computer-implemented method includes receiving motion capture data of a target from a camera, generating a first set of motion trajectories from the motion capture data, generating a first set of augmented motion trajectories using a set of data augmentation functions on the first set of motion trajectories, generating a radar cross-section of the target using the motion capture data to perform at least one of gesture recognition or activity detection, generating one or more synthetic electromagnetic (EM) signatures of one or more activities of the target using the first set of augmented motion trajectories and the radar cross-section, and training a machine learning model configured for EM signature-based gesture recognition or activity detection with a domain adaptation process using the one or more synthetic EM signatures.

Abstract: An apparatus includes a via-fed dual-polarized patch, a first capacitive-fed dual-polarized patch, and a second capacitive-fed dual-polarized patch. The first capacitive-fed dual-polarized patch is capacitively coupled to the via-fed dual-polarized patch through an air gap. The second capacitive-fed dual-polarized patch is capacitively coupled to the first capacitive-fed dual-polarized patch through a dielectric layer.

Abstract: A method includes receiving, by a processor, a video of an illuminated face. Video frames in the video are associated with different time instants of a time series, respectively. The method includes determining a region of interest (ROI) that includes a closed eye on the face based on at least one frame in a plurality of video frames in the video. The method includes slicing each ROI based on slice parameters for selecting a vertical slice that includes a eye centroid of the closed eye, and selecting a horizontal slice that intersects the vertical slice at a pivot (P) located lp pixels from the eye centroid. The method includes determining an eyeball motion signal according to the time series, based on a measured value of a shadow intensity of the eye within at least one of the vertical slice or the horizontal slice at each of the different time instants.

Abstract: An apparatus includes a first, second, and third substrates. The first substrate includes a first antenna element supporting a first frequency band and a second frequency band higher than the first frequency band. The first substrate includes a first dielectric material having a first dielectric constant. The second substrate includes a second antenna element supporting the first frequency band and the second frequency band. The second substrate includes the first dielectric material. The third substrate is disposed between the first substrate and the second substrate and includes a third antenna element supporting the second frequency band. The third substrate includes a second dielectric material having a second dielectric constant lower than a first dielectric constant. The first and second antenna elements form a first beam in the first frequency band. The first, second, and third antenna elements form a second beam in the second frequency band.

Abstract: An apparatus includes a substrate and a plurality of antenna elements on the substrate and arranged according to an antenna configuration. The antenna configuration includes a rectangular antenna patch, and first and second pairs of circular antenna patches. The first pair of circular antenna patches supports a first angular polarization, wherein the circular antenna patches of the first pair are coupled to opposite corners of the rectangular antenna patch. The second pair of circular antenna patches supports a second angular polarization that is orthogonal to the first angular polarization, wherein the antenna patches of the second pair are coupled to opposite corners of the rectangular antenna patch, wherein each of the antenna patches of the first pair are positioned on corners adjacent to both of the antenna patches of the second pair.

Abstract: A device includes a substrate and at least one electrically conducting portion supported by the substrate, the at least one electrically conducting portion including a signal line and a ground plane electrically isolated from the signal line. The electrically conducting portion includes a layer of a first electrically conducting material and a layer of a metal oxide material including anodic aluminum oxide (AAO) and one or more nanowires (NW) of a second electrically conducting material each formed within a corresponding pore extending through the AAO from a first side of the layer to a second side of the layer of the metal oxide material opposite the first side.

Abstract: In some examples, an antenna system includes a source antenna and a frequency selective surface (FSS) comprising a first section including a first set of horizontally oriented unit cells, a second section including a second set of horizontally oriented unit cells, and a third section between the first section and the second section, the third section including a set of vertically oriented unit cells, wherein the first section is substantially square in shape, and wherein the second section is substantially square in shape. The source antenna is configured to emit one or more electromagnetic signals through the FSS, wherein the FSS causes the one or more signals to form at least a first beam corresponding to the first section, and wherein the FSS causes the one or more signals to form at least a second beam corresponding to the second section.

Abstract: In some examples, an antenna system includes a source antenna and a frequency selective surface (FSS) comprising a first section including a first set of horizontally oriented unit cells, a second section including a second set of horizontally oriented unit cells, and a third section between the first section and the second section, the third section including a set of vertically oriented unit cells, wherein the first section is substantially square in shape, and wherein the second section is substantially square in shape. The source antenna is configured to emit one or more electromagnetic signals through the FSS, wherein the FSS causes the one or more signals to form at least a first beam corresponding to the first section, and wherein the FSS causes the one or more signals to form at least a second beam corresponding to the second section.

Abstract: An antenna system may include a source antenna, a frequency selective surface (FSS), and a second antenna or a fluidic channel associated with a housing. In both examples, the FSS has a first side and a second side opposite from the first side. The first side includes horizontally oriented unit cells positioned as multiple columns of unit cells. The first side of the FSS faces the source antenna and is separated from the source antenna by a defined distance. The housing is positioned on the second side of the FSS. In the latter example, the fluidic channel of the housing includes one of air or deionized water. The fluidic channel is positioned on a portion of the second side of the FSS that is opposite to a subset of the horizontally oriented unit cells on the first side of the FSS.

Abstract: An antenna system may include a source antenna, a frequency selective surface (FSS), and a second antenna or a fluidic channel associated with a housing. In both examples, the FSS has a first side and a second side opposite from the first side. The first side includes horizontally oriented unit cells positioned as multiple columns of unit cells. The first side of the FSS faces the source antenna and is separated from the source antenna by a defined distance. The housing is positioned on the second side of the FSS. In the latter example, the fluidic channel of the housing includes one of air or deionized water. The fluidic channel is positioned on a portion of the second side of the FSS that is opposite to a subset of the horizontally oriented unit cells on the first side of the FSS.