Download PTP 300 Series User Guide

1 About This User Guide
1.8.3 Power Density Exposure Limit
The applicable power density exposure limit from the documents referenced above is:
•
10 W/m2 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
P .G
S=
4π d 2
Where
S
power density in W/m2
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
Rearranging terms to solve for distance yields:
d=
P.G
4π .S
8
4Gon www.4Gon.co.uk [email protected] Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299