NEC iPASOLINK EX Advanced Installation Manual page 78

8-12
8.5 Safety Guideline for Microwave Radiation Hazard
The radiation levels of Microwave and Millimeter-Wave iPASOLINK series are very
low, and no health hazard has been reported for them so far. However, advanced
countries that care much about health hazard have started regulating the radiation
levels. For EU countries, it is specified by EN 62311 Annex A A.2. In order to follow
the regulation, operators should not work near the antenna if its transmitter is
activating. Especially, the radiation level of a specific area (X and Y in the illustration
below) in front of antenna is high.
See the following illustration and Calculation Examples 1 and 2:
Power density in front of the antenna turns high along the antenna beam. Ensure not
to allow yourself radiated by beams anytime.
Figure 8-13 Radiation Hazard Area
Calculation Example 1
SAFETY DISTANCE: X m
The power density and field strength level can be obtained by the following
calculation formula:
GGS-000546-13E
–90 to +90
degrees
Power Density : S =
Where
P = Output Power (W),
P' = Output Power (dBm),
G = Antenna Gain (dBi),
(in condition of angle and range from antenna)
R = Distance between human being and antenna (m)
X
Y


P
10
2
(W/m ) =
2
4R
iPASOLINK EX Advanced: I
ADJUST ANTENNA ANGLE
ANTENNA
iPASOLINK EX/A
Calculation Example 2
SAFETY DISTANCE: Y m

P' + G – 30

10
(mW/cm
2
40R
2
)
NSTALLATION