Siemens SIMATIC RF642A Betriebsanleitung Seite 21

Alignment of transponders to the antenna
Polarization axis
Since the RF642A antenna has linear polarization, it is necessary to consider the alignment of the transponders with regard
to the polarization axis of the antenna.
The polarization axes of antenna and transponder must always be parallel. The symbol on the antenna indicates the
polarization axis.
Figure 2 Polarization axis
SIMATIC RF642A
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J31069-D0226-U001-A2-7618, 12/2010