A radio frequency identification (RFID) device detection system includes
an RFID device reader configured to detect RFID devices within a
predetermined designated area, and two or more jamming signal
transmitters configured to prevent the RFID device reader from detecting
and reading devices outside of the designated area. The jamming signal
transmitters may include a pair of low-frequency field generator loops
driven out of phase with one another. RFID devices for use with the
detection system may have a pair of antennas, one for detection by the
RFID reading system, and another antenna for use in receiving signals
from the jamming signal transmitters, in order to prevent communication
with a wireless communication device such as an RFID chip, to which the
antennas are coupled. The two antennas may be coupled to the RFID chip in
parallel, with the antennas each coupled to the same contacts of the RFID
chip.