User's Manual
CSM 320 User Guide
Issue 1, October 2009 DRAFT 4 for REGULATORY REVIEW Page 20
Table 9: Calculated exposure distances and power compliance margins
Variable
Band
Unit
P
G
S
d
(calcu-
lated)
Recom-
mended
Separation
Distance
Power
Compliance
Margin
3.3 GHz to
3.8 GHz
SM
0.5 W
(27 dBm)
28.2
(14.5 dB)
10
W/m
2
33 cm
50 cm
(~20 in)
2.23
The Recommended Separation Distance is chosen to give significant compliance margin in all
cases. This is a conservative distance:
It is along the beam direction (the direction of greatest energy). Exposure to
the sides and back of the module is significantly less.
It meets sustained exposure limits for the general population (not just short-
term occupational exposure limits), with some margin.
The calculated compliance distance d is overestimated because the far-field
equation models the antenna as a point source and neglects the physical
dimension of the antenna.
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