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T T ransponder
7 7 .1
Overview
7.1.1
Mode of operation of transponders
The transponder mainly comprises a microchip with an integrated memory and a dipole
antenna.
The principle of operation of a passive RFID transponder is as follows:
Figure 7-1
The transmission ranges achieved vary depending on the size of the transponder and
therefore its dipole antenna. In general the following rule applies: The smaller the
transponder and therefore the antenna, the shorter the range.
SIMATIC RF600
System Manual, 06/2019, J31069-D0171-U001-A22-7618
Diversion of some of the high-frequency energy emitted by the reader to supply power to
the integrated chip
Receiving commands from the reader
Responses are transmitted to the reader antenna by modulating the reflected radio waves
(backscatter technique)
Mode of operation of transponders
7 7
359
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