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

A technology of RFID tags and feature coding, which is applied in the direction of recording carriers, antennas, instruments, etc. used by machines, can solve problems such as coding failure, and achieve the effect of improving accuracy and improving spectrum utilization

Active Publication Date: 2022-02-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment

[0034] like figure 1 As shown, a combined ultra-wideband cross-polarized chipless RFID tag working system based on MFCC feature coding is composed of an RFID reader, a transmitting antenna TX, a receiving antenna RX and a label. The transmitting antenna TX emits horizontally polarized electromagnetic waves As an interrogation signal, the scattered wave after the signal is reflected by the tag can be obtained by the receiving antenna RX in the vertical polarization direction. Emphasize, and then use the time window of 20ns and the window moving step of 10ns to perform short-time Fourier transform, and then extract the 12-dimensional MFCC (Mel Frequency Cepstrum Coefficient, Mel Frequency Cepstral Coefficient) feature value of each frame. The tag implements the 2-8GHz MFCC feature encoding method, and can implement 15-bit encoding in total.

[0035] like figure 2 , 3 As shown, a combined ultra-wideband cross-polarized chipless RFID tag based on MFCC feature coding works in t...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/077
CPCG06K19/07745G06K19/07773H01Q1/2225G06K19/0672G06K19/0772
Inventor 缪雨辰孟脦崴陈宇豪陈积明贺诗波史治国
Owner ZHEJIANG UNIV
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