SIMATIC RF640A
10
J31069-D0225-U001-A
2
-7618, 1
2
/2010
Antenna radiation patterns in the FCC frequency band
Directional radiation pattern USA (FCC)
The directional radiation pattern is shown for nominal alignment and a center frequency of 915 MHz.
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Figure 5
Reference system
The half-power beam width of the antenna is defined by the angle between the two -3 dB points (corresponding to half the
power referred to the maximum power). Which range (in %) corresponds to the dB values in the patterns can be obtained
from this table (Page 13).
Note that the measurements presented graphically below were carried out in a low-reflection environment. Deviations can
therefore occur in a normally reflecting environment.
