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Estimated RF Exposure for 2 GHz Field-Coder II with 5W Power Amp
0.0
1.0
2.0
3.0
4.0
5.0
0 100 200 300 400 500 600 700
Distance, cm
Power Density, mW/cm^2
Max Permissible
Exposure: 1mW/cm
2
30 dBi Antenna
Max Exposure at 560 cm
0 dBi Antenna
Max Exposure at 20 cm
16 dBi Antenna
Max Exposure at 120 cm
5 dBi Antenna
Max Exposure at 35 cm
Figure 1
Summary
In order the keep the RF exposure within the FCC limit, it is necessary to maintain the safe distance from
the antenna. The results shown in Figures 1 can be summarized in the following table:
Minimum permissible distance from antenna (cm)
Antenna Gain
(dBi)
0 25
5 40
16 130
30 620
Notice the above table indicates worst-case situation (straight in front of the antenna).