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Radiation hazard assessment
Calculation
Calculation is used to identify the Compliance Boundary; outside this boundary the
radiation levels meet the Basic Restriction, which is defined in
2
W/m
.
The distance from the antenna at which the Power Flux Density limit is equal to
some specified value is calculated using the Cylindrical Wave model as follows:
S
Where S = Power density (W/m
of the radio (Watts), D = Antenna diameter (meters), d = Distance from point
source (meters),
Rearranging terms to solve for distance yields:
d
Distances from antenna
Table 4-92
frequency bands and antenna sizes at the peak of the antenna beam. At these and
greater distances, the power density from the RF field is not considered to be
hazardous.
Table 4-92 PTP 800 minimum separation distances, ETSI method
Antenna
diameter
0.3 m (1 ft)
0.6 m (2 ft)
0.8 m (2.5 ft)
1.2 m (4 ft)
1.8 m (6 ft)
These separation distances are significantly lower than those calculated by the
method specified by the FCC. The ETSI method recognises that radiation is
distributed across the antenna aperture and is not in reality a point source.
4-68
P
.
180
S
G
Dd
G
= 3 dB antenna beamwidth (degrees).
P
.
180
S D
G
S
specifies calculated minimum separation distances for a range of
6
GHz
band
band
N/A
N/A
N/A
2.0 m
N/A
2.2 m
1.7 m
2.2 m
1.8 m
2.1 m
2
), P = Maximum average transmit power capability
7
11
GHz
GHz
band
N/A
2.1 m
1.8 m
1.6 m
2.2 m
1.7 m
2.0 m
1.9 m
1.8 m
1.6 m
Chapter 4 Reference information
1999/519/EC
18
23
GHz
GHz
band
band
2.0 m
1.8 m
2.0 m
2.0 m
2.0 m
phn-1478_005v000
as 10
26
38
GHz
GHz
band
band
2.4 m
2.4 m
2.0 m
2.1 m
2.3 m
N/A
2.5 m
N/A
N/A
N/A
Apr 2010
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