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ApplicationNo. 11169736 filed on 06/30/2005
US Classes:340/572.8, Specified device housing or attachment means340/572.1, Detectable device on protected article (e.g., "tag")340/572.4, Specified processing arrangement for detected signal340/573.1Human or animal
ExaminersPrimary: Nguyyen, Tai T.
Attorney, Agent or Firm
International ClassG08B 13/14
AbstractA radio frequency transponder includes at least one battery, which is coupled to provide electrical power for operating the transponder and at least one antenna, which is configured to receive and backscatter RF interrogation radiation from an interrogation device. An integrated circuit is arranged to store a code including information and, powered only with energy provided by the battery, to vary a radiation characteristic of the antenna responsively to the code so as to modulate the information onto the backscattered radiation.