Antenna Patterns - Siemens SIMATIC RF600 System Manual

6.8.6

Antenna patterns

Transponder alignment
The antenna RF680A has an adjustable antenna (circular or linear horizontal or linear
vertical). With a circular antenna the alignment of the antenna axis of symmetry changes
between horizontal and vertical each time it transmits. For this reason, with a circular
antenna the alignment of the transponder polarization axis (horizontal/vertical) is
unimportant. Make sure, however, that the transponder is aligned with the antenna.
Figure 6-53
With a linear vertical or linear horizontal antenna, the alignment of the transponder
polarization axis, must correspond to the alignment of the antenna axis of symmetry.
Figure 6-54
SIMATIC RF600
System Manual, 06/2019, J31069-D0171-U001-A22-7618
Alignment of the transponder polarization axis with a circular antenna axis of symmetry
Alignment of the transponder polarization axis with a linear vertical or linear horizontal
antenna axis of symmetry
Antennas
6.8 SIMATIC RF680A
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