Tag antenna and tag

Abstract

The invention provides a tag antenna and a tag. The tag antenna comprises a substrate and an antenna pattern formed on the substrate, wherein the antenna pattern comprises a first sub structure, a second sub structure and a third sub structure; the first sub structure adopts a sealed annular shape; the second sub structure and the third sub structure are the same in structure and are symmetrically arranged in the first sub structure; the second sub structure and the third sub structure are connected with the first sub structure separately; and the first sub structure, and the second sub structure and the third sub structure form the sealed shape.

Description

technical field [0001] The invention relates to the field of radio frequency technology, and in particular to a tag antenna and a tag. Background technique [0002] At present, passive UHF RFID technology is widely used in various industries, such as personnel management, cold chain transportation and other industries. In some application backgrounds, such as personnel management, it is necessary to attach RFID tags to the human body, so in many occasions, it is necessary to design a special tag antenna for the application of the human body surface. [0003] Under free space conditions, the recognition distance between the RFID reader and the RFID tag is determined by the following formula: [0004] R = λ 4 π E I R P * G t a g ...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problem that the existing RFID tags are applied to the human body surface with a short recognition distance, the present invention provides a tag antenna and a tag with a large recognition distance both on the human body surface and in free space.

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