Combined ultra-wideband cross-polarization chipless RFID tag based on MFCC feature coding

Abstract

The invention discloses a combined ultra-broadband cross-polarized chipless RFID tag based on MFCC feature coding, which includes a label patch unit, a dielectric substrate and a grounding layer; the label patch unit includes a barcode type resonance unit and a double L-shaped resonance unit ;The barcode resonant unit is composed of five identical rectangular patches arranged in parallel and rotated counterclockwise; the double L-shaped resonant unit is composed of two L-shaped patches composed of four identical rectangular patches; The antenna emits a horizontally polarized electromagnetic wave as an interrogation signal. The scattered wave reflected by the tag is acquired by the receiving antenna, and the receiver obtains the scattered wave spectrum. The spectrum is transformed into a time-domain signal by Fourier inverse transform, and the response of the tag is extracted through the window. , extracting MFCC features through steps such as pre-emphasis and short-time Fourier transform; the tag implements 2‑8GHz MFCC feature encoding, and a total of 15 bits of encoding can be achieved. The invention has the advantages of low cost, large coding capacity, easy detection in 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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