RFID tag anti-transfer method using random capacitor

Abstract

The invention provides an RFID tag anti-transfer method using a random capacitor. The RFID tag anti-transfer method comprises the following steps: arranging at least one capacitor plate on top-layer metal in a chip; arranging a metal film parallel to the top-layer metal on the upper plane of the packaging salient point of the chip; and packaging the chip and a tag antenna together to form an RFID tag, wherein the capacitor plate and the metal film form an initialization capacitor. According to the method, whether the tag is repeatedly used or not is verified through the difference between the capacitance of the capacitor plate and the capacitor of the metal film and the initialization capacitor after the RFID tag is transferred, and anti-counterfeiting is achieved.

Description

technical field [0001] The invention relates to the technical field of anti-counterfeiting electronic tags, in particular to a method for preventing transfer of RFID tags using random capacitance. Background technique [0002] RFID radio frequency identification technology is commonly used in the anti-counterfeiting of valuables. In the existing technology, chips or labels can be removed from the packaging antenna without damage through certain technical means; How to realize the anti-counterfeiting of labels has always been a research direction. [0003] In recent years, the research on anti-counterfeiting has become more and more mature. For example, CN202010373859.2 proposes a fragile anti-counterfeiting label that is easy to remove. However, after the label is torn, a complete chip can be obtained, and the RFID label can still be used after packaging the chip; CN202010432963.4 also proposes a dynamic color-changing two-dimensional code anti-counterfeiting label, which i...

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Problems solved by technology

[0003] In recent years, research on anti-counterfeiting has become increasingly mature. For example, CN202010373859.2 proposes a fragile anti-counterfeiting label that is easy to remove. However, after the label is torn, a complete chip can be obtained, and the RFID label can still be used when the chip is packaged; CN202010432963.4 also proposes a dynamic color-changing two-dimensional code anti-counterfeiting label, and the protection is set outside the label body for customs clearance. Frame, temperature-sensitive color-changing layer, anti-counterfeiting information layer, the protective frame can be quickly snapped and disassembled, and the anti-counterfeiting information layer contains a variety of anti-counterfeiting information to effectively protect the label body, but the production process of this kind of label is cumbersome and costly , and the size of the label is relatively large, so it is not suitable to be used on some expensive and delicate commodities

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