Siemens SIMATIC RF610T ATEX System Manual page 281

P P olarization axis and axis of symmetry are orthogonal to each other
In a configuration based on the following directional radiation pattern of the antenna, the axis
of symmetry of the antenna and the polarization axis of the transponder are orthogonal to
each other.
SIMATIC RF600
System Manual, 06/2019, J31069-D0171-U001-A22-7618
Antennas
6.4 SIMATIC RF640A
281