Wave-absorbing material in RFID anti-metal label application

After more than ten years of development in China’s RFID industry, now the technology has been relatively mature, especially in the past two years, under the background of the country actively encouraging and vigorously promoting the healthy development of the industry, with the continuous promotion of the Internet of Things, it has maintained a steady rising development trend.

The industry has also reached a consensus on the frequency standard formulation of RFID.At present, the international frequency of 13.56MHz,13.56MHz high-frequency RFID technology has a stable performance and reasonable price, matching its reading distance range and practical application distance range, so it is widely used in bus card and mobile phone payment.

The RFID electronic tag is used under the 13.56MHz, which usually has a maximum read and write distance of about 10 cm, and the chip’s current consumption is about 1 mah.Because as the frequency increases, the inductance of the required electronic tag coil shows a decrease in the number of coil turns, usually where the typical number of turns is 3 to 10 turns.

The RFID tag-reading card distance is not only related to itself, but also has a lot to do with its environment.When using inductively coupled RFID systems, it is often required that a reader or electronic tag antenna be mounted directly on a metal surface.However, it is not possible to install a magnetic antenna directly on a metal surface.

RFID electronic label is often used in metal environment. When RFID electronic label is close to metal, because the metal is strongly reflective to electromagnetic waves, so it will be accompanied by the signal weakening, the card distance will become closer, serious interference will appear card failure phenomenon.The current common solution is to put a layer of wave-absorbing material on the back of the electronic label.

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