Enhanced Range Passive Wireless Controller
AssigneeEzero Technologies LLC
InventorDavid L. Henty
Life of this patent
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Abstract
A wireless keyboard and reader combination comprises a keyboard having a plurality of keys, an antenna, and a plurality of passive transponder circuits, employing backscatter transmission coded in the time domain using a reflected series of pulses, coupled to the antenna and associated with the keys. For example, SAW transponders may be employed. The passive transponder circuits are selectively coupled to the antenna and provide a coded response identifying a key in response to key activation. An associated reader includes a source of an interrogating field applied to the antenna of the keyboard and a decoder for determining the coded response from the passive transponder circuits.
Claims5
A short range wireless controller system, comprising:
- a controlled device having a transmitter transmitting an interrogating field and a receiver;
- and
- a controller having one or more manually activated inputs, an antenna and a surface acoustic wave modulator transmitting a coded backscatter modulated return field to the receiver, employing the antenna, in response to activation of a manually activated input;
- wherein the backscatter modulated return field is detected at the receiver in the controlled device and wirelessly initiates a control function with the coded response.
A short range wireless controller, comprising:
- one or more manually activated inputs,
- an antenna adapted to couple to an externally provided interrogating field;
- a passive modulator having no power supply;
- and
- a switch coupled between the modulator and antenna and activated by one or more of the inputs;
- wherein the modulator transmits a backscatter modulated return field to the receiver, employing the antenna and by modulating the interrogating field, in response to activation of the switch by a manually activated input.
Dependencies are inferred from the claim text.