User guide

PTP 800 Series User Guide Radiation hazard assessment
phn-2513_004v000 (Oct 2012)
4-87
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:π∂
δπ 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),
δ
= 3 dB antenna beamwidth (degrees).
Rearranging terms to solve for distance yields:
δπ DS
P
d
180.
=
Distances from antenna
Table 210 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 210 PTP 800 minimum separation distances, ETSI method
Band 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)
6 GHz N/A N/A N/A 1.7 m 1.8 m
7 and 8 GHz N/A 2.0 m 2.2 m 2.2 m 2.1 m
11 GHz N/A 1.8 m 2.2 m 2.0 m 1.8 m
13 GHz 1.6 m 1.4 m 1.4 m 1.5 m 1.4 m
15 GHz 1.8 m 1.5 m 1.6 m 1.6 m 1.6 m
18 GHz 2.1 m 1.6 m 1.7 m 1.9 m 1.6 m
23 GHz 2.0 m 1.8 m 2.0 m 2.0 m 2.0 m
26 GHz 2.4 m 2.0 m 2.3 m 2.5 m N/A
32 and 38 GHz 2.4 m 2.1 m N/A N/A N/A