1. Definition
Active rfid, also known as active rfid, its operating power is completely supplied by the internal battery. At the same time, part of the battery’s energy supply is converted into the radio frequency energy required for the communication between the electronic tag and the reader, and it usually supports remote identification.
Passive tags, known as passive tags, can convert part of the microwave energy into direct current for their own operations after receiving the microwave signal announced by the reader. When the passive RFID tag approaches 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. With anti-interference ability, users can customize the reading and writing standards; quasi-data is more efficient in special application systems, and the reading distance can reach more than 10 meters.

2. Working principle
1. Active electronic tag means that the energy of the tag work is provided by the battery. The battery, memory and antenna together constitute the active electronic tag, which is different from the passive radio frequency activation method. It always sends information out of the set frequency band before the battery is replaced.
2. The performance of passive rfid tags is greatly affected by the tag size, modulation form, circuit Q value, device power consumption and modulation depth. Passive radio frequency tags have a 1024bits memory capacity and ultra-wide working frequency band, which not only conforms to relevant industry regulations, but also enables flexible development and application, and can read and write multiple tags at the same time. Passive radio frequency tag design, without battery, memory can be repeatedly erased and written more than 100,000 times.
3. Price and service life
1. Active rfid: high price and relatively short battery life.
2. Passive rfid: the price is cheaper than active rfid, and the battery life is relatively long. Fourth, the advantages and disadvantages of the two
1. Active RFID tags
Active RFID tags are powered by a built-in battery, and different tags use different numbers and shapes of batteries.
Advantages: long working distance, the distance between active RFID tag and RFID reader can reach tens of meters, even hundreds of meters. Disadvantages: large size, high cost, use time is limited by battery life.
2. Passive RFID tags
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 electric 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 thin sheets or hanging 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 a more powerful RFID reader is generally required.