User's Manual Part 3

ROI-S05750 INITIAL LINE UP
3-16
Safety Guideline for Microwave Radiation Hazard
The Microwave and Millimeter-wave that NLite E series are transmitting is at a very small radiation
level an
d never has been reported to effect human health. Advanced countries concerned about health
hazards have started to regulate the radiation levels. The operator should not work near the parabolic
antenna during RF transmission. The area in front of and to the side of the antenna show high radiation
levels. Please see below figure and calculation sample 1.
The front side of antenna presents a high power density in th
e antenna beam area. Therefore, the user of
this system should pay attention not to radiate the beam against humans at any time. (Please refer below
calculation sample 2)
ODU
- 90 to +90
degrees
ANTENNA
Hazard Area of Radiation
In addition, the Power density and Field strength level is calculated by equat
ion below.
10 × K
Power density S (mW/cm
2
) =
40
× π × R
2
P+G−30
10
Where:
P = Output power of ODU (dBm),
G = Antenna Gain (dBi),
(in consideration of th
e angle from antenna)
K = Reflection factor =2.56 (given),
R = Distance between Human and Antenna (m)
Calculation example 1, (90 degree side of antenna)
NLite E = 18 GHz/+23 dBm,
Antenna diameter = 0.6 m,
0 degree antenna gain = 39 dBi,
90 degrees side antenna gain = −24 dBi,
(90 degrees attenuation = −63 dB),
Distance = 0.1 m
Power density S (mW/cm
2
) = 0.0016 ≤ 0.01
Calculation example 2, (0 degree
, front side of antenna)
NLite E = 7 GHz/+27 dBm,
Antenna diameter = 1.8 m,
0 degree antenna gain = 40 dBi,
Distance = 100 m
Power density S (mW/cm
2
) = 0.01