IEEE Spectrum March, 2007 - 21
anatomy of an RFID tag
as an antenna and uses an RFId reader's varying magnetic
field to power the microchip and transmit a radio signal.
Each Verichip's signal is a unique identifying number that
links to a medical record database.
sIZe the device is 11 millimeters
long and about 1 mm in diameter,
comparable to a grain of rice.
tIssUe-bonDIng CaP
A cap made from a special plastic
covers a hermetically sealed glass
capsule containing the RFId circuitry.
the plastic is designed to bond
with human tissue and prevent the
capsule from moving around once it
has been implanted.
antenna the coils of the antenna
turn the reader's varying magnetic
field into current to power the chip.
the coil is coupled to a capacitor
to form a circuit that resonates at
134 kilohertz.
ID ChIP the chip modulates
the amplitude of the current going
through the antenna to continuously
repeat a 128-bit signal. the bits
are represented by a change in
amplitude-low to high or high to low.
An analysis by Jonathan westhues,
of cambridge, Mass., indicated that
only 32 of the bits varied between
any two Verichips. the rest of the
bits probably tell the reader when the
loop starts and may also contain some
error-checking or correction data.
lEStER lEFkowItz (2)
the Verichip implantable RFId tag, shown below, is the only
tag approved for use in humans for a medical application. It
is a simple device consisting of a coil of wire and a hermetically sealed microchip within a glass capsule. the coil acts
Table of Contents for the Digital Edition of IEEE Spectrum March, 2007
IEEE Spectrum March, 2007 - Cover1
IEEE Spectrum March, 2007 - Cover2
IEEE Spectrum March, 2007 - 1
IEEE Spectrum March, 2007 - 2
IEEE Spectrum March, 2007 - 3
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IEEE Spectrum March, 2007 - 47
IEEE Spectrum March, 2007 - 48
IEEE Spectrum March, 2007 - Cover3
IEEE Spectrum March, 2007 - Cover4
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