Passive Rfid Tag Circuit Diagram. 1 schematically illustrates the architecture of proposed tag. The proposed passive rfid tag is applied for special regions at 430mhz.
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There are two types of rfid tags. This leaves them with a shorter reading distance of up to 20 feet. As the rfid card tag is swiped against the rfid reader a carrier signal of 125 khz is send to the tag coil which receives this signal and modulates them.
The tag system is constructed of tag chip and coil antenna.
2 is proposed as an equivalent circuit for the rfid tag though the matching circuit considered in 4 was simpler than the one shown in fig. Block diagram of the system. Passive rfid tags have no battery source and rely on the electromagnetic coupling of an antenna for their power. The tag contains an ic for storing the data an antenna for transmitting and receiving and also a modulator.
