A dual-frequency flexible ultra-high frequency rfid anti-metal tag

Abstract

The invention discloses a dual-frequency flexible UHF RFID anti-metal tag, which includes a first substrate, a second substrate, a third substrate, a flexible dielectric board, an antenna radiation unit, an antenna reflection unit, a short circuit unit and a radio frequency chip. The substrate, the second substrate and the third substrate form an inner cavity, the flexible dielectric plate is located in the inner cavity, the antenna radiation unit and the radio frequency chip are arranged on the upper surface of the first substrate, and the radio frequency chip is connected to 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 surface of the third substrate, the short-circuit unit is respectively connected with the antenna radiation unit and the antenna reflection unit, and an open circuit slot extending to the right end is arranged on the antenna radiation unit , the open slot is used to make the surface current direction of the antenna radiating unit change with the frequency, thereby generating two adjacent working frequency bands; the advantage is that it has two working frequency bands on the basis of small size and high performance, and has a wide range of applications.

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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