An RFID Tag Antenna Applied in Dense Environment

Abstract

The invention relates to a radio frequency identification tag antenna applied in a dense environment, and belongs to the technical field of wireless antennas. Including tag chip, loading strip, radiation patch and dielectric substrate; radiation patch includes a pair of stepped radiation arms, a pair of U-shaped connecting arms, a pair of L-shaped connecting arms and a straight connecting arm; the straight connecting arm is relative to the tag antenna The axis of symmetry is symmetrical; a pair of stepped radial arms, a pair of U-shaped connecting arms and a pair of L-shaped connecting arms are all located inside the straight connecting arms, and the loading bar is located outside the straight connecting arms; the loading bar is in the shape of a straight line, And parallel to the straight connecting arm; when the distance between the loading bar and the radiation patch is 2mm, the maximum power transmission coefficient of the radio frequency identification tag antenna of the present invention is greater than 0.7. When the tag antenna of the present invention is in an environment where the distance between tags is relatively large, it also has a relatively wide frequency band and has stable performance. The radio frequency identification tag antenna of the invention has simple structure and good production processability.

Description

Technical field[0001]The present invention belongs to the technical field of wireless antenna, and more particularly to a radio frequency identification (RFID) tag antenna.Background technique[0002]RFIo Frequency Identification, RFID "is a non-contact automatic identification technology that transmits electromagnetic wave signals through the reader antenna, the label antenna receives electromagnetic wave signals and modulated, and reverse the modulated signal back to the reader antenna, completed The process of communication. At present, with the development of technology, since the UHF RFID tag has advantages such as a large number of communications protocols that are easy to manufacture, high reading rate, reading distance far and standardized, it has gradually become the mainstream of current research. However, when the label is in book management, clothing management, it requires a large number of labels and the distance between the label is very close, due to the mutual interfe...

AI Technical Summary

Problems solved by technology

In the existing research, for the application of the tag antenna in a dense environment, it is still improved based on the most widely used tag antenna Alien 9662 in the existing market, and the tag antenna coupling is reduced by shortening the length of the tag antenna. Mutual impedance, so that the influence of mutual interference of tag antennas in dense environments is small, but the structure of the Yagi-Uda antenna used in it is relatively complex, and in dense environments, the power transmission coefficient of tags is still low

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