|Date:||January 28, 2015|
|Length:||3 / 643|
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Passive tags require no internal power source, whereas active tags require a power source.
1.2 Basics of RFID Tags
RFID tags can be either passive, semi-passive (also known as semi-active), or active.
Passive RFID tags have no internal power supply. The minute electrical current induced in the antenna by the incoming radio frequency signal provides just enough power for the CMOS integrated circuit (IC) in the tag to power up and transmit a response...
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The minute electrical current induced in the antenna by the incoming radio frequency signal provides just enough power for the CMOS integrated circuit (IC) in the tag to power up and transmit a response. Most passive tags signal by backscattering the carrier signal from the reader. This means that the aerial (antenna) has to be designed to both collect power from the incoming signal and also to transmit the outbound backscatter signal...
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