SIMATIC RF650R/RF680R/RF685R
Configuration Manual, 03/2018, C79000-G8976-C386-06
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Appendix
A
A.1
Planning and installation of UHF read points
RFID UHF systems (frequency band 865 - 928 MHz) due to their comparatively large
effective range have different requirements in terms of planning, commissioning and
operation compared with the HF systems commonly used up to now in automation
(frequency band 13.56 MHz). This section describes important rules for preparation and
implementation of the RFID UHF systems.
A.1.1
Technical basics
General
In contrast to inductively coupled HF systems, in UHF technology, there is full propagation of
the radio waves just as in other wireless systems (radio, TV etc). There are both magnetic
and electrical field components present. The following graphic shows the structure of a UHF
system. One characteristic is the design of the transponder that differs greatly from the
structure used in HF systems, e.g. the use of a dipole or helix antenna.
Figure A-1 Structure of a UHF RFID system
