10-4 ANTENNA ORIENTATION
NWD-107460-02E Installation
Safety Guideline for Microwave Radiation Hazard
The Microwave and Millimetre-wave that iPASOLINK series are treating is very
small radiation level and never been reported to effect human health. But advanced
countries about health hazard have started to regulate the radiation levels. In case of
EU country, it is specified by EN50385. In order to keep the regulation, the operator
shouldn't work at near parabolic antenna during transmitter activating. Especially the
area in side to front of antenna shows higher radiation level. (please see below figure
and calculation sample 1.)
On the other hand, in case of front side of antenna, the power density becomes high
level along antenna beam. Therefore the user of this system should pay attention not
to radiate the beam against humans any time. (Please refer below calculation sample
2.)
Hazard Area of Radiation
In addition, the Power density and Field strength level is calculated by equation
below.
Where:
P = Output power of ODU (dBm),
G = Antenna Gain (dBi),
(in consideration of the angle from antenna)
K = Reflection factor = 2.56 (given),
R = Distance between Human and Antenna (m)
ODU
-
9
Antenna
0.1 m for Calculation example 1
0.1 m for Calculation example 1
100 m for Calculation example 2
Power density
SmW cm
2
⁄()
10
PG30–+
10
--------------------------
⎝⎠
⎛⎞
K×
40 π R
2
××
---------------------------------
=
Submission Prohibited
NEC Internal Use Only
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