Radiation hazard assessment
Chapter 4 Reference information
phn-1478_005v000
4-68
Apr 2010
Calculation
Calculation is used to identify the Compliance Boundary; outside this boundary the
radiation levels meet the Basic Restriction, which is defined in
1999/519/EC as 10
W/m
2
.
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:
G
S
Dd
P
S
180
.
Where S = Power density (W/m
2
), P = Maximum average transmit power capability
of the radio (Watts), D = Antenna diameter (meters), d = Distance from point
source (meters),
G
= 3 dB antenna beamwidth (degrees).
Rearranging terms to solve for distance yields:
G
S
D
S
P
d
180
.
Distances from antenna
Table 4-92
specifies calculated minimum separation distances for a range of
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
6
GHz
band
7
GHz
band
11
GHz
band
18
GHz
band
23
GHz
band
26
GHz
band
38
GHz
band
0.3 m (1 ft)
N/A
N/A
N/A
2.1 m
2.0 m
2.4 m
2.4 m
0.6 m (2 ft)
N/A
2.0 m
1.8 m
1.6 m
1.8 m
2.0 m
2.1 m
0.8 m (2.5 ft)
N/A
2.2 m
2.2 m
1.7 m
2.0 m
2.3 m
N/A
1.2 m (4 ft)
1.7 m
2.2 m
2.0 m
1.9 m
2.0 m
2.5 m
N/A
1.8 m (6 ft)
1.8 m
2.1 m
1.8 m
1.6 m
2.0 m
N/A
N/A
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.
Содержание PTP 800
Страница 22: ...List of Tables phn 1478_005v000 xx Apr 2010 ...
Страница 72: ...System management Chapter 1 Product description phn 1478_005v000 1 38 Apr 2010 ...
Страница 290: ...Alternative approaches Chapter 5 Installation phn 1478_005v000 5 116 Apr 2010 ...
Страница 326: ...Upgrading the PTP 800 Chapter 6 Operation phn 1478_005v000 6 36 Apr 2010 Figure 6 18 Software Upgrade Complete page ...
Страница 346: ...Managing performance Chapter 6 Operation phn 1478_005v000 6 56 Apr 2010 Figure 6 27 System Statistics and Counters page ...
Страница 354: ...Managing performance Chapter 6 Operation phn 1478_005v000 6 64 Apr 2010 ...