Siemens SIMATIC RF600 Series System Manual page 61

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②
③
Figure 4-7
Linear antennas can only be used if the alignment of the transponder is defined. On the
other hand, one advantage of linear antennas is that they react less sensitively to reflections.
This restriction does not apply with circular polarization. Circular antennas can also be used
with differing alignments of the transponder and achieve constant results (e.g. RF680A or
RF685R). It has been shown that with a defined transponder alignment, the linear antenna
normally produces the best results.
4.6.2 Implementation of UHF RFID installations
The use of UHF RFID systems requires careful planning and preparation to avoid problems
during commissioning and operation.
4.6.2.1 Preparation phase
Device selection
When selecting the suitable RFID hardware, remember the following minimum criteria:
● Integration in a control/IT environment
● Degree of protection
● Size of the identification range
● Type, number and position of the transponders in the antenna field
● Reflecting and absorbent materials in the vicinity of the antenna
● Distance between the antenna or the reader and the transponder
SIMATIC RF600
System Manual, 10/2016, J31069-D0171-U001-A19-7618
Polarization axes parallel: approx. 100 % range
Polarization axis turned through 45°: approx. 50% range
Polarization axis turned through 90°: approx. 10% range
Effect of the polarization axes on the write/read distance with linear antennas
4.6 Planning and installation of UHF read points
RF600 system planning
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