RFID tags | The difference between RFID active tags and passive tags

2022-02-15 11:08:23

 RFID tags

Conceptually different:
1) Active RFID, also known as active RFID, is divided according to the power supply method of the tag, and usually supports long-distance identification. The active electronic tag is equipped with a battery to supply power, without the need for a reader to provide energy, the cost is high, the life is short, and the battery needs to be replaced after the energy is exhausted.
2) Passive RFID, that is, the passive radio frequency tag adopts the frequency hopping working mode and has anti-interference ability. Users can customize the reading and writing of standard data, which is more efficient in special application systems, and the reading distance can reach more than 10 meters. Passive RFID tags have no batteries, low cost, long service life, and shorter read and write distances than active tags.

Both work differently
Active RFID tag means that the energy of the tag's work is provided by the battery. The battery, memory and antenna together form an active electronic tag. Different from the activation method of passive radio frequency, the information is always sent out through the set frequency band before the battery is replaced.
The performance of passive RFID tags is greatly affected by tag size, modulation form, circuit Q value, device power consumption, and modulation depth. Passive radio frequency tags have a memory capacity of 1024bits and an ultra-wide working frequency band, which not only complies with relevant industry regulations, but also can be flexibly developed and applied, and can read and write multiple tags at the same time. Passive RFID tag design, no battery needed, the memory can be repeatedly erased and rewritten more than 100,000 times.

Advantages and disadvantages of both
Active RFID tags are powered by built-in batteries, and different tags use different numbers and shapes of batteries.
Advantages: long operating distance, the distance between the active RFID tag and the RFID reader can reach tens of meters, or even hundreds of meters.
Disadvantages: Large size, high cost, limited use time by battery life.

The passive RFID tag does not contain a battery, and its power is obtained from the RFID reader. When the passive RFID tag is close to the RFID reader, the antenna of the passive RFID tag converts the received electromagnetic wave energy into electrical energy, activates the chip in the RFID tag, and sends the data in the RFID chip.
Advantages: small size, light weight, low cost, long life, can be made into different shapes such as sheets or buckles, and used in different environments.
Disadvantages: Since there is no internal power supply, the distance between the passive RFID tag and the RFID reader is limited, usually within a few meters, and generally requires a higher power RFID reader.