Near-field (or nearfield) communication (NFC) is a set of standards for smartphones and other mobile devices to establish radio communication with each other by touching them together or bringing them into close proximity, usually no more than a few centimeters. Current NFC systems use a radio frequency of 13.56 MHz, corresponding to a wavelength ...
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http://en.wikipedia.org/wiki/Near_field_communication
Near-field Communication RFID reader antennas emit electromagnetic radiation (radio waves). If an RFID tag is within full wavelength of the reader, it is said to be in the 'near field.' If it is more than the distance of one full wavelength away, it is said to be in the 'far field.' The near field signal decays as the cube of distance from the an...
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http://www.wordinfo.info/words/index/info/view_unit/3991/7
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