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Proximity key tags &
proximity cards (or
access cards) are hybrid technology that incorporate
a simple electric circuit (proximity tag and coil)
imbedded in a plastic card. No battery is needed and
the circuit is not removable without destroying it
and the card. When the card is correctly positioned
with respect to a reader a high speed RF signal
passes between card and reader and unique data is
transferred.
The ISO standard
proximity card comes in either 1.8mm thick or 0.75mm
thick and can have printed material attached to the
front. It is supplied with a pre-assigned unique
code.
The ultrasonic proximity
tag comes attached to a keychain and is supplied
with a pre-assigned unique code. |