Antennas
6.8 SIMATIC RF680A
SIMATIC RF600
318 System Manual, 11/2018, J31069-D0171-U001-A21-7618
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 Alignment of the transponder polarization axis with a circular antenna axis of symmetry
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 Alignment of the transponder polarization axis with a linear vertical or linear horizontal
antenna axis of symmetry
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