Effect of Human on Radiation Pattern of Passive UHD RFID Tag
A. Jain, S. Agarwal, D. W. Engels
University of Texas at Arlington, USA
Radio frequency identification (RFID) is being used as a primary technology for Auto Identification and Data Capture (AIDC) in present days. Readers, tags and information system forms the three basic parts of the RFID system. The RFID system uses RF waves for transmitting and receiving the data to and from the tag. The communication involved between the reader and tag can be active, semiactive or passive depending on the type of the tag used. Active tags have an internal battery that allows for long-read range. They are typically read/write capable and are often seen in toll collection applications. Passive tags do not have a battery; they harvest energy from the reader signal and use it to power the internal circuitry as well as to reply to the interrogator query. As the reader RF signal is the only power source for a passive UHF tag, any interference in power harvesting would adversely affect communication. The paper deals with the effects of interaction of human in RFID communication system on the passive tags. Previously a good deal of work has been done on the effects of RFID radiation on the human body. All researchers have majorly studied the affect of human on radiation pattern for active devices. In this paper we show the effect of Human body on the radiation pattern of the patch antenna used for RFID application.
IEEE Antennas and Propagation Society International Symposium (APSURSI)
2010
July
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