User guide

Release9.5ReleaseNotes
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Issue2,October2009  Page68
Band Antenna
Variable
d
(calcu-
lated)
Recom-
mended
Separation
Distance
Power
Compliance
Margin
P G
S
5.7 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
0.2 W
(23 dBm)
316
(25 dB)
10
W/m
2
71 cm 1.5 m
(5 ft)
4.5
Integrated plus
LENS
0.2 W
(23 dBm)
50
(17 dB)
1
W/m
2
28 cm 50 cm
(12 in)
3.13
5.4 GHz
OFDM
Integrated, 17 dBi 0.05 W
(10 dBm)
50
(17 dB)
10
W/m
2
6 cm 20 cm
(8 in)
10
Connectorized, 17
dBi
0.05 W
(10 dBm)
50
(17 dB)
10
W/m
2
6 cm 20 cm
(8 in)
10
4.9 GHz
OFDM
Integrated, 17 dBi 0.063 W
(18 dBm)
40
(16 dB)
10
W/m
2
14 cm 20 cm
(8 in)
2
Connectorized, 17
dBi
0.063 W
(18 dBm)
40
(16 dB)
10
W/m
2
14 cm 20 cm
(8 in)
2
The Recommended Separation Distance is chosen to give significant compliance margin in all
cases. It is also chosen so that a given item (bare module, reflector, or LENS) always has the
same distance, regardless of frequency band, to simplify remembering and following exposure
distances in the field.
These are conservative distances:
 They are along the beam direction (the direction of greatest energy).
Exposure to the sides and back of the module is significantly less.
 They meet sustained exposure limits for the general population (not just
short-term occupational exposure limits), with considerable margin.
 In the reflector cases, the calculated compliance distance d is greatly
overestimated because the far-field equation models the reflector as a point
source and neglects the physical dimension of the reflector.