User's Manual Part 2
Release8InstallationandConfigurationGuide
Issue2,November2007 Draft5forRegulatoryReview 170
S =
P ⋅ G
4
π
d
2
where
S = power density in W/m
2
P = RMS transmit power capability of the radio, in W
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
4
π
S
Table 38 shows calculated minimum separation distances d, recommended distances
and resulting power compliance margins for each frequency band and antenna
combination.
Table 38: Calculated exposure distances and power compliance margins
Fre-
quency
Band
Antenna
Variable
d
(calcu-
lated)
Recom-
mended
Separation
Distance
Power
Compliance
Margin
P G
S
900 MHz
external
0.4 W
(26 dBm)
10.0
(10 dB)
6 W/m
2
23 cm
60 cm
(24 in)
7
integrated
0.25 W
(24 dBm)
15.8
(12 dB)
6 W/m
2
23 cm
60 cm
(24 in)
7
indoor,
integrated
Simulation model used to estimate Specific
Absorption Rate (SAR) levels
10 cm
(4 in)
2
2.4 GHz
integrated
0.34 W
(25 dBm)
6.3
(8 dB)
10
W/m
2
13 cm
20 cm
(8 in)
2.3
integrated
plus
reflector
0.34 W
(25 dBm)
79.4
(19 dB)
10
W/m
2
46 cm
1.5 m
(5 ft)
10
5.2 GHz
integrated
0.2 W
(23 dBm)
5.0
(7 dB)
10
W/m
2
9 cm
20 cm
(8 in)
5
integrated
plus
reflector
0.0032 W
(5 dBm)
316
(25 dB)
10
W/m
2
9 cm
1.5 m
(5 ft)
279
integrated
plus LENS
0.025 W
(14 dBm)
40
(16 dB)
10
W/m
2
9 cm
50 cm
(12 in)
31
5.4 GHz
integrated
0.2 W
(23 dBm)
5.0
(7 dB)
10
W/m
2
9 cm
20 cm
(8 in)
5
integrated
plus
reflector
0.0032 W
(5 dBm)
316
(25 dB)
10
W/m
2
9 cm
1.5 m
(5 ft)
279
integrated
plus LENS
0.020 W
(13 dBm)
50
(17 dB)
10
W/m
2
9 cm
50 cm
(12 in)
31
5.4 GHz
OFDM
integrated
0.01 W
(10 dBm)
50
(17 db)
10
W/m
2
6 cm
20 cm
(8 in)
10