Influence Of External Components - Siemens SIMATIC RF600 System Manual

4.5.4

Influence of external components

The R&TTE guideline and the relevant standards govern the electromagnetic compatibility
requirements. This also concerns the external components of the RF600 system. Even
though the requirements for electromagnetic compatibility have been specified, various
components will still interfere with each other.
The performance of the RF600 system is highly dependent on the electromagnetic
environment of the antennas.
Reflections and interference
On the one hand, antenna fields will be weakened by absorbing materials and reflected by
conducting materials. When electromagnetic fields are reflected, the antenna field and
reflecting fields overlap (interference).
External components in the same frequency band
On the other hand, external components can transmit on the same frequency band as the
reader. Or the external components can transmit in different frequency bands with side
bands that overlap with the frequency band of the reader. This results in a reduction of the
"signal-to-noise" ratio which reduces the performance of an RF600 system.
If a DECT station that is transmitting in the 2 GHz band, for example, is located in the
receiving range of an antenna of the RF600 system, the performance of the write and read
accesses to the transponder will be affected.
SIMATIC RF600
System Manual, 10/2009, J31069-D0171-U001-A8-7618
4.5 The response of electromagnetic waves in the UHF band
RF600 system planning
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