System and method for interrogation radio-frequency identification
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United States of America Patent
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Jan 7, 2014
Grant Date -
Feb 19, 2009
app pub date -
Aug 16, 2007
filing date -
Aug 16, 2007
priority date (Note) -
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Abstract
A system and method for communicating with contactless IC cards of multiple protocols and power levels includes generating a first alternating magnetic field with an interrogator for energizing a proximate IC card and receiving a data transmission from the IC card. A processor of the interrogator is configured to decode the received data transmission. The interrogator then generates a second alternating magnetic field having a different magnetic field strength than the first alternating magnetic field when failing to decode the data transmission being received from the IC card. The processor then attempts to decode a data transmission received from the IC card in response to the second alternating magnetic field.
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