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Passive rfid tag and Active Rfid tag
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>> RFID Technology News >> Passive rfid tag and Active Rfid tag



What the differences between the passive rfid tag and active rfid tags?



Active RFID tags have a transmitter and their own power source (typically a battery). The power source is used to run the microchip's circuitry and to broadcast a signal to a reader (the way a cell phonetransmits signals to a base station). Passive tags have no battery. Instead, they draw power from the reader, which sends out electromagnetic waves that induce a current in the tag's antenna. Semi-passive tags use a battery to run the chip's circuitry, but communicate by drawing power from the reader. Active and semi-passive tags are useful for tracking high-value goods that need to be scanned over long ranges, such as railway cars on a track, but they cost more than passive tags, which means they can't be used on low-cost items.

Generally speaking, active tags have a much longer read range—300 feet ( 100 meter) or more—than passive tags. The read range of passive tags depends on many factors: the frequency of operation, the power of the reader, interference from other RF devices and so on. In general, low-frequency and high-frequency tags are read from within three feet (1 meter) and UHF tags are read from 10 to 20 feet ( 3~ 6 meter), Readers with phased array antennas can increase the read range of passive tags to 60 feet or more ( 20 meter or above).
For details , check the following chart.
Tags and features Passive tag Active Tag Semi passive tag
Internal power Sourse No Yes Yes
Signal by backscattering the carrier wave from the reader Yes No Yes
Response Weaker Stronger Stronger
size Small Big Medium
Cost Less expensive More exprensive Less
Potential shell life Longer Shorter Longer
Range from 10cm to few meters >100 meters >100 meters
Sensors No Yes Yes

Passive RFID requires stronger signals from the reader, and the signal strength returned from the tag is constrained to very low levels. Active RFID allows very low-level signals to be received by the tag (because the reader does not need to power the tag), and the tag can generate high-level signals back to the reader. Additionally, the Active RFID tag is continuously powered, whether in the reader field or not. Active tags can also 'beacon', or initiate communication with a reader (or other tags) when certain conditions are present. Active tags can contain external sensors to monitor temperature, humidity, motion, and other conditions.

* Any question or inquiry about RFID card and RFID related products, please send email to info@oprfid.com, we will reply you within 24 hours, thanks

 
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        Active RFID and Passive RFID are fundamentally different technologies that are often evaluated together. While both use radio frequency energy to communicate between a tag and a reader, the method of powering the tags is different. Active RFID uses an internal power source (battery) within the tag to continuously power the tag and its RF communication circuitry, whereas Passive RFID relies on RF energy transferred from the reader to the tag to power the tag.