Combined ultra wide band cross polarization chipless RFID tag based on MFCC feature coding

Abstract

The invention discloses a combined ultra wide band cross polarization chipless RFID tag based on MFCC feature coding. The combined ultra wide band cross polarization chipless RFID tag comprises a tagpatch unit, a dielectric substrate and a grounding layer, wherein the label patch unit comprises a bar code type resonance unit and a double-L type resonance unit; the bar code type resonance unit isformed by arranging five same rectangular patches in parallel and rotating anticlockwise; each double-L-shaped resonance unit is formed by reversely combining two L-shaped patches consisting of four same rectangular patches; a transmitting antenna transmits a horizontally polarized electromagnetic wave as an interrogation signal; scattered waves obtained after signals are reflected by a label areacquired by a receiving antenna, scattered wave frequency spectrums are acquired by a receiver, the frequency spectrums are converted into time domain signals through inverse Fourier transform, and response of the label is extracted through a window; MFCC features are extracted through the steps of pre-emphasis, short-time Fourier transform and the like. The label realizes a 2-8GHz MFCC characteristic coding mode, and 15-bit coding can be realized in total. The RFID tag has the advantages of being low in cost, large in coding capacity, easy to detect in the actual environment and the like.

Description

technical field [0001] The invention relates to the field of chipless RFID, in particular to a combined ultra-wideband cross-polarized chipless RFID tag based on MFCC feature coding. Background technique [0002] Radio Frequency Identification (RFID) uses radio frequency signals to detect and identify tags attached to the surface of objects. On the basis of inheriting the original functions of the barcode, radio frequency identification adds the functions of remote reading, batch reading and modifying the information contained in the label. These advantages of radio frequency identification make it have great development potential in fields such as logistics, tracking and access control. However, because traditional radio frequency identification requires radio frequency tags containing integrated circuit chips, and integrated circuit chips are expensive and difficult to apply on a large scale, the research on designing a low-cost chipless tag that removes integrated circui...

AI Technical Summary

Problems solved by technology

At present, the frequency-domain coding methods with large coding capacity that have been studied more are mainly with or without coding, amplitude coding, offset coding, and mixed coding. However, when these coding methods are used in actual scenarios, they often appear in different frequency bands. degree of coding failure

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