Importance

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Abstract

Interrogators, wireless communication systems, methods of operating an interrogator, methods of monitoring movement of a radio frequency identification device, methods of monitoring movement of a remote communication device and movement monitoring methods are provided. According to one aspect, an interrogator includes communication circuitry configured to output a forward wireless signal to a radio frequency identification device and to receive a return wireless signal from the radio frequency identification device; and a processor coupled with the communication circuitry and configured to process the return wireless signal to monitor movement of the radio frequency identification device. Another aspect provides a method of operating an interrogator including the steps of outputting a forward wireless signal; receiving a return wireless signal from a radio frequency identification device; processing the return wireless signal; and monitoring movement of the radio frequency identification device after the processing.

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First Claim