Radio frequency identification technology (RFID) is a technology for automatic identification through radio waves, which can be used to track and identify objects, people or animals. The RFID system consists of a reader and a tag, where the tag contains a chip and an antenna that can communicate with the reader without physical contact. RFID technology has been widely used in retail, manufacturing, logistics, healthcare, agriculture and security. So what is the basic principle, application scenarios, advantages and limitations of RFID technology.
Basic principles of radio frequency identification technology
RFID technology is a technology for automatic identification through radio frequency signals. The RFID system consists of a reader and a tag, where the tag contains a chip and an antenna. The reader activates the circuit in the tag chip by sending a radio wave signal, which allows the tag chip to send a response signal to the reader. The response signal contains a unique identifier and other useful information about the tag.
RFID tags can be divided into passive tags and active tags. Passive tags do not have a built-in battery, but activate themselves and transmit data by receiving signals from the reader. Active tags have a built-in battery and can actively send signals for communication.
RFID technology is available in many different frequency ranges, including low frequency, high frequency and ultra high frequency. Different frequency ranges have different performance characteristics and application scenarios. The transmission range of low-frequency RFID tags is shorter, but it has higher anti-interference performance; the transmission range of high-frequency RFID tags is longer, but it is subject to greater interference; the transmission range of UHF RFID tags is wider, but the transmission speed is slower . The selection of RFID technologies with different frequencies needs to be based on the requirements of actual application scenarios.