Siemens SIMATIC RF300 System Manual page 40

Planning the RF300 system
4.1 Fundamentals of application planning
4.1.2 Transmission window and read/write distance
The reader generates an inductive alternating field - also referred to as an antenna field. The
antenna field is strongest close to the reader, whereby a read/write distance of "zero" between
reader and transponder is not recommended.
The field strength of the alternating field decreases strongly the further away from the reader.
The distribution of the antenna field depends on the structure and geometry of the antennas in
the reader and transponder.
For the transponder to function correctly, a minimum field strength at the transponder must be
achieved at a distance S
The figures below show the transmission window between transponder and reader or between
transponder and antenna:
40
from the reader or the antenna.
g
System Manual, 02/2021, C79000-G8976-C345-09
SIMATIC RF300