Fractal technology-based chipless RFID (radio frequency identification) tag and RCS (radar cross section) amplitude coding method thereof

Abstract

The invention discloses a fractal technology-based chipless RFID (radio frequency identification) tag and an RCS (radar cross section) amplitude coding method thereof. The tag comprises a dielectric substrate and a plurality of resonators, wherein the upper surface is provided with a metal layer, the resonators are arranged on the metal layer of the dielectric substrate, and the resonator comprises a slit in the metal layer and metal strips in the slit, wherein the slit includes a central vertical slit and a central transverse slit intersecting with each other perpendicularly at an intersection. The tag is characterized in that the at least one resonator structure is subjected to fractal technology processing: a plurality of transverse slits are uniformly distributed at two sides of the central transverse slit additionally with the central transverse slit adopted as a symmetry axis; a plurality of vertical slits are uniformly distributed at two sides of the central vertical slit additionally with the central transverse slit adopted as a symmetry axis; and a vertical metal strip in the central vertical slit intersects with a center transverse metal strip in the central transverse slit at an intersection. The tag of the invention has the advantages of high frequency spectrum utilization, un-correlation to polarization directions, single-layer structure, simplicity and easiness in processing.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a chipless radio frequency tag, in particular to a chipless RFID tag based on fractal technology and an RCS amplitude encoding method thereof. Background technique [0002] Radio frequency identification (RFID) technology is a technology that uses radio frequency signals to read the stored information of the target to achieve target identification. It has been widely used in the fields of goods circulation and libraries. Compared with bar code and other technologies, the cost of RFID tags is still high, which severely restricts the application of RFID. The RFID tag of the prior art contains a chip for storing information, making it difficult to reduce the cost. Therefore, chipless RFID tags have become a new hotspot in RFID research. The basic principle of the chipless tag is to design the tag as a series of different electromagnetic scattering structures according to the elec...

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Problems solved by technology

[0004] In the above two types of tags, the dipole resonance frequency occupies a large frequency band, which is not conducive to reducing the noise of the card reader. The sensitivity of the card reader is high during measurement, and the number of bits carried in the unit frequency band is small; Moreover, these two tags are very sensitive to the polarization direction, and the placement angle of the tags has a great influence on the measurement

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