Patent ID: 8134542

Claim:
An untethered stylus configured to cooperate with a location sensor, the location sensor configured to generate a magnetic field comprising a plurality of frequencies and communicatively couple to the stylus, the stylus comprising: a housing comprising a tip and a shield; circuitry provided in the housing and comprising a power circuit; and an antenna arrangement comprising: a plurality of coil resonant circuits each tuned to a different frequency of the magnetic field and each coupled to the stylus tip; a first coil resonant circuit of the plurality of coil resonant circuits coupled to the power circuit and configured to energize the power circuit in response to the magnetic field, the power circuit configured to provide DC power to the circuitry when energized; and one or more other coil resonant circuits of the plurality of coil resonant circuits coupled between the tip and shield of the housing to define separate channels for communicatively coupling the stylus tip and the location sensor, wherein 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.