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BIS U Basic Manual
2
Safety distances to the antenna
When using the identification system BIS U, it is possible that people will remain within the wave
range of the antennas briefly or for longer periods.
In addition to product standards, which were designed to protect other radio services from
interference or negative influences from the RFID system, the International Commission on
Radiological Protection (ICRP) has defined a set of RF field limit values for avoiding damage to
human tissue via RF fields. These are called basic values and represent the specific absorption
(SA) in J/kg or specific absorption rate (SAR) in W/kg and describe the direct or indirect effects
on human tissue.
Derived values that can be measured or calculated using simpler methods are adopted for
practical applications. These have been defined such that the basic values are never exceeded,
even under the most unfavorable exposure conditions.
For a conventional long-range antenna with a radiated power of 2 watts
direction, this lower limit value is usually exceeded if the distance is greater than 24 cm. The
safety distance is 30 cm for 4 watts
The safety distance decreases accordingly for lower transmitting powers.
The result of this occupational safety regulation is that people should not be closer than 24 cm or
30 cm to the antenna for longer periods.
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