Passive and semi-active uhf rfid tag
Semi-active rfid, which combines the advantages of active RFID tags and passive RFID tags, as a special marker. In most cases, it is often in a dormant state and does not work. It does not send an RFID signal to the outside world. Only when it enters the activation signal range of the low frequency activator, the tag is activated before it starts to work.
The passive uhf rfid tag, that is, the passive radio frequency tag adopts the frequency hopping working mode, has anti-interference ability, and the user can customize the reading and writing standard data, and the efficiency is more rapid in the special application system, and the reading distance can reach more than 10 meters.
Second, the working principle is different
Semi-active rfid, a common active electronic tag operating in the 433M band or 2.4G operating band. It works normally after being activated. The activation distance of the low-frequency activator is limited, it can only be activated precisely in a small range of small distances, so that the low-frequency activator is used as the base point for positioning, different base points are installed at different positions, and then a long distance is used in a large area. The reader recognizes the read signal and then uploads the signal to the management center using different upload methods, thus completing the entire process of collecting, transmitting, processing, and applying the entire signal.
The performance of passive rfid tags is greatly affected by tag size, modulation format, circuit Q value, device power consumption, and modulation depth. Passive RF tag 1024bits memory capacity, ultra-wide working frequency band, not only meet the relevant industry regulations, but also flexible development and application, can read and write multiple tags at the same time. Passive RF tag design, no battery required, memory can be erased more than 100,000 times.
Third, there is no built-in battery
Passive RF tags do not support built-in batteries, and special parts of semi-passive tags rely on batteries.