Transponder/Tags; Mode Of Operation Of Transponders - Siemens SIMATIC RF660 System Manual

Transponder/tags

7.1

Mode of operation of transponders

The tag/transponder mainly comprises a microchip with an integral memory and a dipole
antenna.
The principle of operation of a passive RFID transponder is as follows:
• Diversion of some of the high-frequency energy emitted by the reader to supply power to
• Commands received from reader
• Responses are transmitted to the reader antenna by modulating the reflected radio
Figure 7-1 Mode of operation of transponders
The transmission ranges achieved vary in accordance with the size of the tag and the
corresponding dipole antenna. In general the following rule applies: The smaller the tag and
therefore the antenna, the shorter the range.
RF600
System Manual, 09/2005 Edition, J31069 D0171-U001-A0-7618,
the integral chip
waves (backscatter technique)
7
7-1