An electronic tag is an RFID label, which is the common name of RFID. RFID is an acronym for Radio Frequency Identification.
It is true that radio waves are reflected by metals at ultra-high frequencies and absorbed by water. For example, our human body is an excellent barrier to RFID RF signals because we have a lot of salt water in our bodies. The interference from metals also disrupts the RFID radio frequency signal, which becomes a major challenge for RFID radio frequency identification supply chain management, especially in the operating environment with many metals and liquids.
The RFID reader antenna has the function of absorbing RF energy, and the metal can cause eddy currents around the RFID label reader, thereby reducing the overall effectiveness of the RFID electromagnetic field. These eddy currents also induce their own magnetic fields perpendicular to the metal surface, and these perpendicular magnetic fields can disable the reader area.
Metals also cause additional parasitic capacitance (i.e. energy loss due to the electromagnetic "friction" caused by the metal), causing detuning of the RFID reader and RFID label antenna, damaging the performance of the system. Ultimately, in certain frequency bands, the energy reflected back by the metal can cause interference between the RFID label and the RFID reader. Therefore, the application of RFID radio frequency identification technology in an environment with many metal substances will greatly reduce the actual RFID read-write rate, read-write distance and reliability, which is far lower than the results obtained by trial in a laboratory environment. However, it is also undeniable that sound system design and operation will overcome the vast majority of disturbances. And a successful example has convinced many enterprises that this solution is worth looking forward to.
Tracking and managing expensive and reusable mobile assets and their contents is one area of supply chain management that has been successfully applied to the metal environment. These mobile assets are used to carry raw materials, semi-finished products and finished products in many different supply chains. Such as beer kegs, bulk food and chemical stainless steel containers. They even have properties that make HF RFID labels and UHF RFID labels a logical technology for tracking. First, these assets are generally relatively expensive. Second, the loads for these assets are generally expensive or time-critical. Third, the information collected by the RFID network can better plan and execute the logistics channel.