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the RFID anti-metal tag can achieve

15 Nov 2017
The anti-metal tag is an electronic label encapsulated with a special anti-magnetic absorbing material. 

Many RFID tags need to be attached to the surface of a metal object. When a conventional passive UHF RFID tag with a dipole antenna is applied to a metal surface, the performance is drastically reduced and can not even be read effectively. 

Metal objects' influence on the label antenna parameters and performance mainly come into two aspects: one is the antenna field, another is the antenna parameters (such as: impedance, S parameters, radiation efficiency). 

In the field where the antenna is operated, there are the incident wave emitted by the reader and the reflected wave reflected by the metal plate, and the incident wave and the reflected wave have a certain phase difference, resulting in a certain degree of mutual cancellation between the two. In this way, the tagged antenna operating in this environment can not sense enough current to provide energy to the tag chip, making the tag chip can not be activated to cause it fail. 

And the antenna parameter changes because the antenna works on the metal surface, the metal plate as part of the antenna itself, so that even if the physical size of the antenna does not change, its impedance value, S parameters, etc. have changed, resulting in the antenna Performance degradation. 

Therefore, the appropriate anti-metal label, is a prerequisite to ensure RFID system application. 

rfid anti metal tag

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