Chipless RFID Tag Using Annular Slot Coding
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Solution Overview
Problem
Current RFID tag technologies are costly due to the expensive integrated chip, which hinders their adoption in large-scale warehouse management, necessitating a low-cost alternative.
Innovation Solution
A slot-type ultra-wideband depolarized chipless RFID tag is developed, comprising a metal plate with etched annular slot groups on a dielectric substrate, utilizing Mel-scale Frequency Cepstral Coefficients (MFCC) feature coding and a transceiver antenna to achieve 16-bit coding within the 2-8 GHz frequency band, eliminating the need for an integrated chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RFID tag technology is used for warehouse management, then identification efficiency and automation are improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and removes the expensive integrated chip component from the RFID tag structure, retaining only the essential antenna and tag body made of inexpensive materials like paper or plastic. This extraction allows the tag to maintain RFID functionality while eliminating the primary cost driver, making large-scale deployment economically viable.
Solution Approach 2:
The patent employs disposable, low-cost tag bodies made from common materials such as paper or plastic that can be easily manufactured and discarded. These tags are designed to be inexpensive enough for single-use or limited-life applications, enabling mass deployment in warehouse management without significant financial burden.
2Ease of manufacture
If barcode technology is used for identification, then manufacturing cost is reduced, but labor cost increases due to manual targeting requirements
Solution Approach 1:
The patent replaces the mechanical line-of-sight scanning requirement of barcode systems with electromagnetic wave-based RFID communication. The tag uses an antenna to transmit and receive electromagnetic signals, allowing the reader to identify tags without physical targeting or line-of-sight constraints, thereby eliminating manual positioning labor while keeping manufacturing costs low.
3Reliability
If RFID tags with integrated chips are used, then information storage and security performance are improved, but manufacturing cost increases
Solution Approach 1:
The patent creates a simplified version of RFID tags that copies the essential identification functionality without the expensive integrated chip. The tag body and antenna together provide sufficient information storage and communication capabilities for basic warehouse management needs, offering a cost-effective alternative that replicates the core value proposition of chip-based RFID tags.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a low-cost, high-capacity coding capability with enhanced frequency spectrum response and anti-interference properties, enabling efficient commodity identification without the need for precise targeting, thus reducing labor costs and improving warehouse management efficiency.
Implementation Method 1
a transceiver antenna TX emits a horizontally polarized electromagnetic wave to serve as an interrogation signal, and the scattered wave obtained after the signal is reflected by the tag is acquired by the transceiver antenna TX
Implementation Method 2
each annular slot of each annular slot group implements MFCC (Mel-scale Frequency Cepstral Coefficients) feature coding in a specific frequency band; the transceiver acquires a frequency spectrum of the scattered wave
Data Source
AI summary
Disclosed is a slot-type ultra-wideband depolarized chipless RFID tag. The tag comprises a tag slot unit, a metal plate and a dielectric substrate, wherein the tag slot unit is formed by means of etching the metal plate, and is located on the upper surface of the dielectric substrate; the tag slot unit is composed of at least four annular slot groups, and tags are distributed in a centrosymmetric manner; and each annular slot group is composed of four concentric annular slots that are distributed in a nested manner; a transceiver antenna TX transmits a horizontally polarized electromagnetic wave; a scattered wave obtained; a transceiver acquires a frequency spectrum of the scattered wave; the spectrum is converted into a time-domain signal; a response of the tag is extracted; and an MFCC feature of the time-domain signal is extracted.