Siemens SIMATIC RF600 Series System Manual page 230

Antennas
6.4 Antenna RF642A
By selecting the correct country profile/frequency range and setting the radiated power (see
technical specifications of the reader being used) and setting the parameters for antenna
gain and cable loss, the maximum radiated power will not be exceeded.
6.4.6 Antenna patterns
6.4.6.1 Antenna radiation patterns in the ETSI frequency band
Directional radiation pattern Europe (ETSI)
The directional radiation pattern is shown for nominal alignment and a center frequency of
866.3 MHz. The nominal antenna alignment is given when the antenna elevation is provided
as shown in the following figure.
Figure 6-24 Reference system
The half-power beam width of the antenna is defined by the angle between the two -3 dB
points. Which range (in %) corresponds to the dB values in the patterns can be obtained
from this table (Page 234).
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