What substances affect the performance of RFID UHF tags?
1, metal substances
The RFID inventory management model has long been used only for companies that are “easy to use RFID” and has shut out companies that stock mostly metal items. That's because the metal also causes additional parasitic capacitance (ie, energy loss caused by electromagnetic "friction" caused by metal), which causes the detuning of the RFID UHF reader and the electronic tag antenna, and degrades the performance of the system.
Eventually, the energy reflected back by the metal creates interference between the RFID tag and the RFID UHF reader. Therefore, the application of RFID technology in an environment with a large amount of metal materials will greatly reduce the actual RFID read/write rate, read/write distance and reliability, which is far lower than the results obtained in the laboratory environment. Of course, interference can also be overcome in a reasonable system design and operation.
Recently, with the rapid development of passive RFID technology, embedded RFID electronic tags have or have half of the RFID functions in the production stage, making it have different market competitiveness compared with other products of the same type.
Some applications of embedded RFID anti-metal tags
The military and law enforcement agencies must accurately calculate the inventory of weapons. There are many purposes for real-time control of the inventory of firearms. One of them is to ensure that the personnel have the right equipment, and the other is to keep track of the inventory (the items are misplaced or stolen). When the equipment requires regular maintenance, each record must be saved, including the maintenance process that the equipment must perform, the maintenance process that has been completed, and so on.
Managers can track and manage RFID-embedded weapons in real time and independently. Not only can you know the number of weapons to be repaired, but you can also know the stock balance in real time to ensure that any weapons are lost. This information can prevent unnecessary orders from being generated, and more importantly, once the weapon is found lost, the regulatory agency can initiate a search action in the first place.
Some large companies need to rent or purchase capital equipment, such as laptops, wireless routers and other IT-related items, and use RFID access and RFID-enabled carts to record real-time information changes in real time. It also reflects the company's immediate return on investment and changes the company's inventory management unit time from days to hours.
Common tools, ranging from hammers, screwdrivers, measuring tapes to generators, electric drills and cranes, are usually leased to construction companies and used as a lease term for construction companies. Therefore, inventory information of equipment leasing companies is very important, and this information will be randomly changed and widely distributed, making inventory inventory a major challenge. Loss of large equipment can cause business losses to the company. While gadgets are not very expensive, they can create corporate liabilities if lost or stolen.
In addition to being reflected by metal, RFID radio frequency identification signals are also absorbed by water in the ultra-high frequency band. 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 metal also disturbs the RFID radio frequency signal, which becomes a major challenge for RFID radio frequency identification supply chain management, especially the operating environment with more metal and liquid components.
The RFID radio frequency reader antenna has the function of absorbing RFID energy, and the metal causes eddy current around the RFID electronic tag reader, thereby reducing the overall performance of the RFID electromagnetic field. These eddy currents also cause their own magnetic fields perpendicular to the metal surface, and these vertical magnetic fields make the reader area effective.