| 摘要 |
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.
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