Abstract: An untethered stylus is configured to cooperate with a location sensor that generates a magnetic field. The stylus include a housing having a tip and a shield. Circuitry, including a power circuit, is provided in the housing. An antenna arrangement provided at the housing includes multiple coil resonant circuits each tuned to a different frequency of the magnetic field. A first coil resonant circuit energizes the power circuit in response to the magnetic field, which provides DC power to the circuitry. One or more other coil resonant circuits are coupled between the tip and shield of the housing to define separate channels for communicatively coupling the stylus tip and the location sensor. An information signal communicated between the stylus tip and the location sensor is substantially unperturbed during provision of DC power by the first coil resonant circuit.

Abstract: Systems and methods provide for adaptive drive signal adjustment to improve reception of a stylus signal at a location sensor. A location sensing system includes an untethered stylus comprising circuitry configured to receive a drive signal and transmit a stylus signal. The circuitry is configured to be energized by the received drive signal and includes frequency-sensitive circuitry. A location sensor includes a controller and a sensing array. The location sensor is configured to generate the drive signal and receive the stylus signal. The controller is configured to adjust a parameter of the drive signal that improves receptivity of the stylus signal by the location sensor.

Abstract: An energy transfer apparatus with a magnetic shield is configured to magnetically couple energy from a fixed location to a mobile or moveable device within a field-activated space of the energy transfer apparatus. Apparatuses include a location sensing surface and a drive coil arranged in relation to a periphery of the location sensing surface. A magnetic shield plate is disposed below the location sensing surface and the drive coil. The shield plate includes a number of radially oriented slots originating at, and distributed about, a periphery of the shield plate.

Abstract: An energy transfer apparatus with a magnetic shield is configured to magnetically couple energy from a fixed location to a mobile or moveable device within a field-activated space of the energy transfer apparatus. Apparatuses include a location sensing surface and a drive coil arranged in relation to a periphery of the location sensing surface. A magnetic shield plate is disposed below the location sensing surface and the drive coil. The shield plate includes a number of radially oriented slots originating at, and distributed about, a periphery of the shield plate.

Abstract: An energy transfer apparatus with a magnetic shield is configured to magnetically couple energy from a fixed location to a mobile or moveable device within a field-activated space of the energy transfer apparatus. Apparatuses include a location sensing surface and a drive coil arranged in relation to a periphery of the location sensing surface. A magnetic shield plate is disposed below the location sensing surface and the drive coil. The shield plate includes a number of radially oriented slots originating at, and distributed about, a periphery of the shield plate.

Abstract: An energy transfer apparatus with a magnetic shield is configured to magnetically couple energy from a fixed location to a mobile or moveable device within a field-activated space of the energy transfer apparatus. Apparatuses include a location sensing surface and a drive coil arranged in relation to a periphery of the location sensing surface. A magnetic shield plate is disposed below the location sensing surface and the drive coil. The shield plate includes a number of radially oriented slots originating at, and distributed about, a periphery of the shield plate.

Abstract: Systems and methods provide for adaptive drive signal adjustment to improve reception of a stylus signal at a location sensor. A location sensing system includes an untethered stylus comprising circuitry configured to receive a drive signal and transmit a stylus signal. The circuitry is configured to be energized by the received drive signal and includes frequency-sensitive circuitry. A location sensor includes a controller and a sensing array. The location sensor is configured to generate the drive signal and receive the stylus signal. The controller is configured to adjust a parameter of the drive signal that improves receptivity of the stylus signal by the location sensor.

Abstract: An untethered stylus is configured to cooperate with a location sensor that generates a magnetic field. The stylus include a housing having a tip and a shield. Circuitry, including a power circuit, is provided in the housing. An antenna arrangement provided at the housing includes multiple coil resonant circuits each tuned to a different frequency of the magnetic field. A first coil resonant circuit energizes the power circuit in response to the magnetic field, which provides DC power to the circuitry. One or more other coil resonant circuits are coupled between the tip and shield of the housing to define separate channels for communicatively coupling the stylus tip and the location sensor. An information signal communicated between the stylus tip and the location sensor is substantially unperturbed during provision of DC power by the first coil resonant circuit.

Abstract: An untethered stylus is configured to cooperate with a location sensing device that generates a continuously varying magnetic drive signal that powers the stylus. The stylus includes a housing having a tip, a shield, and an antenna arrangement coupled between the tip and shield. A resonant circuit of the antenna arrangement is tuned to a frequency of the magnetic drive signal. An oscillator circuit, coupled to and powered by the antenna arrangement, is configured to oscillate at a frequency corresponding to data to be communicated from the stylus, and to amplitude modulate a voltage developed at the stylus tip at the oscillator circuit frequency. Repetitive current draw from the antenna arrangement to power the oscillator circuit repetitively reduces a voltage at the tip, such that the tip voltage is amplitude modulated at the oscillator circuit frequency.

Abstract: An untethered stylus is configured to cooperate with a location sensor. The location sensor is configured to generate a magnetic field comprising a number of frequencies and communicatively couple to the stylus. The stylus is configured to include a housing having a tip and a shield. An antenna arrangement, provided at the housing, includes a number of coil resonant circuits each tuned to a different frequency of the magnetic field. Each of the coil resonant circuits is configured to be energized in response to the magnetic field. The coil resonant circuits of the antenna arrangement may each include an inductive coil disposed about a ferrite rod in a spaced relationship. A connection couples the coil resonant circuits between the tip and shield of the housing to define separate channels for communicatively coupling the stylus tip and the location sensor.