RFID technology uses a variety of frequency bands to achieve data communications, complete the identification of electronic tags and its data read and write functions. Because of its use of non-contact communication methods, using electromagnetic waves as the transmission medium and free space as the transmission channel, the inductive coupling principle or backscattering working principle is generally used, and the specific frequency band and application principle are based on application requirements and application fields. Decision.RFID electronic tag.
When the electromagnetic wave propagates in space, reflection, refraction, scattering, and absorption phenomena cause attenuation of the signal due to loss, and time delay due to multipath effect, and the indoor space environment and the outdoor space environment have great Randomness makes data transmission interference difficult to analyze in a fixed condition model. In addition, due to the openness of space, various electromagnetic wave signals actually present also generate various types of interference on the spatial transmission channel.
In the RFID system, due to the large number of tags, after the reader sends a signal, the response signals from different tags also interfere with each other. Even when multiple readers are used, the readers interfere with each other. In theory, the larger the RFID is. The more complex and prominent the system's own interference problems are. For these reasons, failures such as missed reading and unrecognized events may occur during the data read/write transmission.