Abstract: The wireless power receiver includes at least one wire of a sound-producing device. The at least one wire configured for both conveying sound signals or securing at least part of the sound-producing device to a user, and receiving power waves. The wireless power receiver also includes power harvesting circuitry coupled with the at least one wire and a power source of an electronic device, like a battery. The power harvesting circuitry is configured to isolate the received power waves from the conveyed sound signals, convert the received power waves to usable energy, and provide the usable energy to the power source of the electronic device.

Abstract: A device for monitoring a health parameter of a person includes a semiconductor substrate, and an antenna array including at least one transmit antenna connected to the semiconductor substrate and configured to transmit radio waves below the skin surface of a person and a two-dimensional array of receive antennas connected to the semiconductor substrate and configured to receive radio waves, the received radio waves including a reflected portion of the transmitted radio waves, wherein the semiconductor substrate includes circuits configured to generate signals that correspond to an alignment of the antenna array relative to a vein in the person in response to the received radio waves, and means for determining an alignment of the antenna array relative to a vein in the person in response to the generated signals, and means for outputting a signal that is indicative of the determined alignment of the antenna array relative to the vein.

Abstract: A wearable health monitoring device is disclosed. The device includes an attachment feature configured to engage with an attachment feature of an alignment element that is to be worn on the skin of a person, An RF front-end including a semiconductor substrate, at least one transmit antenna configured to transmit radio waves below the skin surface of the person, and a two-dimensional array of receive antennas configured to receive radio waves, the received radio waves including a reflected portion of the transmitted radio waves, wherein the semiconductor substrate includes circuits configured to generate signals in response to the received radio waves, a digital baseband system configured to generate digital data in response to the signals, wherein the digital data is indicative of a health parameter of the person, and a communications interface configured to transmit the digital data generated by the digital baseband system from the wearable health monitoring device.

Abstract: A method for operating a stepped frequency radar system is disclosed. The method involves performing stepped frequency scanning across a frequency range using frequency steps of a step size, the stepped frequency scanning performed using at least one transmit antenna and a two-dimensional array of receive antennas, changing at least one of the step size and the frequency range, and performing stepped frequency scanning using the at least one transmit antenna and the two-dimensional array of receive antennas and using the changed at least one of the step size and the frequency range.

Abstract: Disclosed is a wireless power transmitter for wirelessly delivering power to a receiver device, the wireless power transmitter including: a plurality of unit cells configured to radiate one or more radio frequency (RF) power transmission waves, each unit cell in the plurality of unit cells including: (i) a metal portion having an interior perimeter that surrounds an aperture defined by the metal portion; and (ii) an antenna that is aligned with the aperture in a first dimension, the antenna being configured to radiate one or more RF power transmission waves for wirelessly charging a receiver device. The one or more RF power transmission waves leak from the wireless power transmitter at least in part through the aperture when the receiver device is positioned within a threshold distance from the unit cell.

Abstract: A method for operating a stepped frequency radar system is disclosed. The method involves performing stepped frequency scanning across a frequency range using frequency steps of a step size, the stepped frequency scanning performed using at least one transmit antenna and a two-dimensional array of receive antennas, changing at least one of the step size and the frequency range, and performing stepped frequency scanning using the at least one transmit antenna and the two-dimensional array of receive antennas and using the changed at least one of the step size and the frequency range.

Abstract: An example wireless power transmitter includes: (i) a ground plate, (ii) a conductive wire offset from the ground plate, the conductive wire forming a loop antenna that is configured to radiate an RF signal for wirelessly powering a receiver device, (iii) a plurality of feed elements extending from the ground plate to the conductive wire, each feed element being connected to the conductive wire at a different position on the conductive wire, and (iv) a power amplifier connected to one or more feed elements of the plurality of feed elements. The power amplifier is configured to selectively feed the RF signal to a respective feed element of the one or more feed elements based on a location of the receiver device relative to the plurality of feed elements.

Abstract: A method of wireless power transmission is provided. The method includes, at a wireless power transmitter, receiving a signal from a receiver device and determining a location of the receiver device based, at least in part, on data included in the signal. The method further includes in response to determining that the location of the receiver device is within a wireless power transmission range of the wireless power transmitter: (I) selecting at least two antennas of the wireless power transmitter's antenna array based, at least in part, on the location of the receiver device, and (II) transmitting, via the at least two antennas of the antenna array, radio frequency power transmission waves that: (i) constructively interfere at the location of the receiver device to produce a focused energy at the location and (ii) destructively interfere around the location of the receiver device to form null-spaces around the focused energy.

Abstract: A wireless charging system comprises (i) a transmitter structure comprising a first metallic core disposed in an opening of the transmitter structure and (ii) a receiver structure comprising a second metallic core disposed in an opening of the receiver structure. The transmitter structure is configured to carry one or more radio frequency (RF) signals to the first metallic core when the receiver structure is within a threshold distance from the transmitter structure. In addition, the receiver structure is configured to be excited by the one or more RF signals from the transmitter structure, whereby the one or more RF signals are transferred from the first metallic core to the second metallic core when the transmitter structure and the receiver structure are within the threshold distance from each other.

Abstract: Operating a stepped frequency radar system involves performing stepped frequency scanning across a frequency range using at least one transmit antenna and a two-dimensional array of receive antennas and using frequency steps of a fixed step size, processing a first portion of digital data that is generated from the stepped frequency scanning to produce a first digital output, wherein the first portion of the digital data is derived from frequency pulses that are separated by a first step size that is a multiple of the fixed step size, and processing a second portion of digital data that is generated from the stepped frequency scanning to produce a second digital output, wherein the second portion of the digital data is derived from frequency pulses that are separated by a second step size that is a multiple of the fixed step size, wherein the first multiple is different from the second multiple.

Abstract: A method for operating a stepped frequency radar system is disclosed. The method involves performing stepped frequency scanning across a first frequency range using frequency steps of a first step size, the stepped frequency scanning performed using at least one transmit antenna and a two-dimensional array of receive antennas, changing from the first step size to a second step size, wherein the second step size is different from the first step size, and performing stepped frequency scanning across a second frequency range using the at least one transmit antenna and the two-dimensional array of receive antennas and using frequency steps of the second step size.

Abstract: A microstrip antenna for use in a wireless power transmission system and a method for forming the microstrip antenna are described. The antenna includes a first multi-layer printed circuit board (PCB) that includes a top surface and a bottom surface. The top and bottom surfaces of the first multi-layer PCB include a first electrically conductive material. The antenna includes a second multi-layer PCB that includes a top surface and a bottom surface. The top and bottom surfaces of the second multi-layer PCT include a second electrically conductive material. A first plurality of vias each substantially pass through the top and bottom surfaces of the first multi-layer PCB. A second plurality of vias each substantially pass through the top and bottom surfaces of the second multi-layer PCB. The antenna further comprises a dielectric slab that is configured to receive the first multi-layer PCB and the second multi-layer PCB.

Abstract: Systems and methods for wireless power transmission based on object identification are provided. A radio frequency wireless power transmitter is in communication with a video camera for capturing image data (e.g., a series of image frames) of at least a portion of a transmission field of the radio frequency wireless power transmitter. One or more processors of the radio frequency wireless power transmitter are configured to (i) detect motion of an object towards the transmission field by applying motion tracking analysis on the series of image frames; and (ii) cause adjustments to transmission of one or more radio frequency power transmission waves by the radio frequency wireless power transmitter to a receiving electronic device based on the motion of the object. The receiving electronic device uses the one or more radio frequency power transmission waves to power or to charge a power source used by the receiving electronic device.

Abstract: Embodiments disclosed herein describe a wireless power receiver including a synchronous transistor rectifier using a Class-E or a Class-F amplifier. The wireless power receiver includes at least one radio frequency (RF) antenna configured to generate an alternating current (AC) waveform from received RF waves. The wireless power receiver further includes a power line configured to carry a first signal based on the AC current generated by the least one RF antenna, and a tap-line coupled to the power line, the tap-line being configured to carry a second signal. The second signal is based on the AC current generated by the least one RF antenna and distinct from the first signal. The wireless power receiver also includes a transistor coupled to at least the power line and the tap-line. The transistor is configured to provide a direct current (DC) waveform to a load based on the first and second signals.

Abstract: The wireless power receiver includes at least one wire of a sound-producing device. The at least one wire configured for both conveying sound signals or securing at least part of the sound-producing device to a user, and receiving power waves. The wireless power receiver also includes power harvesting circuitry coupled with the at least one wire and a power source of an electronic device, like a battery. The power harvesting circuitry is configured to isolate the received power waves from the conveyed sound signals, convert the received power waves to usable energy, and provide the usable energy to the power source of the electronic device.

Abstract: Wireless charging systems, and methods of use thereof, are disclosed herein. As an example, a method includes: (i) receiving, by a communications radio of a wireless power transmitter, a communication signal from a communications radio of a wireless power receiver, the communication signal including data used to determine a location of the wireless power receiver, and (ii) determining a location of the wireless power receiver based, at least in part, on the data included in the communication signal. The method further includes, in response to determining that the location of the wireless power receiver is within a wireless power transmission range defined by the transmitter, transmitting radio frequency (RF) power transmission waves towards the wireless power receiver, the RF power transmission waves converging to form controlled constructive interference patterns and destructive interference patterns in proximity to the location of the wireless power receiver.

Abstract: Wireless charging systems and methods are disclosed herein. An example method includes: sending, by a receiver, a communication signal to a transmitter, the receiver being embedded in a radio frequency (RF) transparent housing that is adapted to electrically connect the game controller with the receiver, wherein: the receiver is separated from the transmitter by a non-zero distance, the RF transparent housing supports the game controller, and the communication signal includes information that allows the transmitter to determine the receiver's location. After the sending, the method includes: (A) receiving, by the receiver, RF signals from the transmitter, wherein: the transmitter determines parameters of the RF signals based on the communication signal, and at least one RF signal from the RF signals constructively interferences with at least one other RF signal from the RF signals at the receiver's location, and (B) converting, by the receiver, the received RF signals into electricity.

Abstract: Methods and systems for monitoring a health parameter in a person using a radar system are disclosed. A method involves performing stepped frequency scanning below the skin surface of a person using at least one transmit antenna and a two-dimensional array of receive antennas, the stepped frequency scanning being performed using frequency steps of a first step size, changing the first step size to a second different step size in response to a change in reflectivity of blood in a blood vessel of the person, performing stepped frequency scanning below the skin surface of the person using the second step size after the step size is changed from the first step size to the second step size, and outputting a signal that corresponds to a blood pressure level in the person in response to the stepped frequency scanning at the first step size and at the second step size.