Siemens SIMATIC RF600 Series System Manual page 276

Antennas
6.7 RF680A antenna
6.7.6.2 Antenna patterns in the FCC frequency band
Antenna pattern FCC
The directional radiation pattern is shown for nominal alignment and a center frequency of
915 MHz.
Figure 6-48 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 280).
Note that the measurements presented graphically below were carried out in a low-reflection
environment. Deviations can therefore occur in a normally reflecting environment.
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System Manual, 10/2016, J31069-D0171-U001-A19-7618
SIMATIC RF600