User's Guide

1 About This User Guide
10
1.8.3 Power Density Exposure Limit
The applicable power density exposure limit from the documents referenced above is:
• 10 W/m
2
for RF energy in the 2.4-, 5.2-, 5.4-, 5.8- and 5.9 GHz frequency bands.
Peak power density in the far field of a radio frequency point source is calculated as follows:
Equation 1 - Peak power density in the far field
Where
Rearranging terms to solve for distance yields:
S power density in W/m
2
P= Maximum Average transmit power capability of the radio, in
G= total Tx gain as a factor, converted from dB
d distance from point source, in m
2
4
.
d
GP
S
π
=
S
GP
d
.4
.
π
=