Double-frequency flexible ultrahigh-frequency RFID (Radio Frequency Identification Device) anti-metal tag

Abstract

The invention discloses a double-frequency flexible ultrahigh frequency RFID anti-metal tag. The tag comprises a first substrate, a second substrate, a third substrate, a flexible dielectric plate, anantenna radiation unit, an antenna reflection unit, a short circuit unit and a radio frequency chip. An inner cavity is defined by the first substrate, the second substrate and the third substrate; the flexible dielectric plate is positioned in the inner cavity; the antenna radiation unit and the radio frequency chip are arranged on the upper surface of the first substrate. the radio frequency chip is connected with the antenna radiation unit; the antenna reflection unit is arranged on the lower surface of the second substrate; the short circuit unit is arranged on the left end face of the third substrate and connected with the antenna radiation unit and the antenna reflection unit, the antenna radiation unit is provided with an open circuit groove extending to the right end of the antenna radiation unit, the open circuit groove is used for enabling the surface current direction of the antenna radiation unit to change along with the frequency, and therefore two adjacent working frequency bands are generated. The tag has the advantages of having two working frequency bands and being wide in application range on the basis of being small in size and high in performance.

Description

technical field [0001] The invention relates to an anti-metal tag, in particular to a dual-frequency flexible ultra-high frequency RFID anti-metal tag. Background technique [0002] In a sense, traditional RFID technology can be considered as a tag-based sensor technology for identifying objects. With the rapid development of RFID technology, the application fields are becoming wider and wider. In some application fields, electronic tags need to be used in metal environments. [0003] Because radio frequency signals are electromagnetic signals, and metals have adsorption and reflection effects on electromagnetic signals, general electronic tags cannot be attached to metal surfaces for use. In this environment, an anti-metal tag was born. Its working principle is mainly based on the medium isolated from the metal (to increase the distance between the metal surface and the tag antenna), and at the same time, the metal is used as a reflective surface to improve the characteris...

AI Technical Summary

Problems solved by technology

Although the flexible RFID anti-metal tag is small in size and low in cost, it is conducive to mass production, but the two rectangular slots in the inner RFID tag layer are equivalent to the two radiation ends of the dipole antenna, so the flexible RFID anti-metal tags only have a single working frequency band under UHF conditions, and the applicable area is small

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