Dual-Mode RFID Tag with Single Loop Antenna
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Solution Overview
Problem
Current RFID systems face challenges in achieving dual-mode operation on a single carrier frequency, particularly in transitioning between close proximity and long-range reading scenarios with robust anti-collision features, which is essential for cost-effective and efficient inventorying and product authentication across various applications.
Innovation Solution
A dual-mode RFID tag with a single multi-turn loop antenna, utilizing a single ASIC chip, operates in two distinct modes: one for near-touch reading with NFC-compatible devices and another for longer-range multi-tag reading with fast anti-collision capabilities, both on the same 13.56 MHz frequency, enabling seamless integration of NFC and HF RFID technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single RFID tag uses dual-mode operation with both NFC and anti-collision protocols, then the tag can support both close proximity and long-range reading scenarios, but the tag complexity and cost increase
Solution Approach 1:
The patent combines NFC and anti-collision RFID protocols into a single tag operating at 13.56 MHz. The tag integrates both command-and-control (NFC) and commandless (anti-collision) communication modes, allowing it to function with both NFC-compatible devices and long-range readers using the same hardware architecture, thereby reducing the need for separate tags while maintaining protocol versatility
Solution Approach 2:
The RFID tag is designed with universal functionality to operate with multiple types of readers. It implements both first communication protocol (NFC-compatible command-and-control) and second communication protocol (anti-collision commandless) modes, enabling a single tag to serve both consumer-level NFC applications and supply chain logistics requiring long-range multi-tag reading capabilities
2Productivity
If anti-collision protocols are implemented in HF RFID systems, then multi-tag reading capability is improved, but the reading range and performance deteriorate compared to dedicated UHF systems
Solution Approach 1:
The patent changes the operational parameters of HF RFID by implementing anti-collision protocols at 13.56 MHz, traditionally reserved for NFC. By modifying the communication protocol parameters to include commandless multi-tag modes while maintaining the HF frequency, the system achieves extended reading range and improved multi-tag productivity without sacrificing the inherent robustness of magnetic field coupling
3Reliability
If HF RFID systems operate at 13.56 MHz with magnetic field coupling, then robustness and security are improved, but the reading range is limited compared to UHF systems
Solution Approach 1:
The system dynamically adapts its operational mode based on the reader type. The tag can switch between NFC-compatible command-and-control mode for close proximity readings and anti-collision commandless mode for long-range multi-tag reading. This dynamic protocol selection allows the HF system to extend its effective reading range while maintaining the robust security and reliability of magnetic field coupling
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
This solution allows for efficient and cost-effective dual-mode operation, supporting both consumer-level interactions and supply chain logistics, enhancing reading range and anti-collision performance while maintaining compatibility with existing NFC standards and reducing tag complexity and cost.
Implementation Method 1
a planar multi-turn loop antenna for enabling powering up of the passive RFID tag via wireless inductive coupling of a magnetic field
Data Source
AI summary
A magnetic field induction coupled RFID system for scanning and reading at least one object having an RFID tag or inlay label device attached or embedded therein to impart a unique identity to each of the objects. The RFID tag has two distinct modes of air interface protocol operation, such that the tag is capable of being read at close proximity range by a device utilizing a command-and-control protocol, such as an NFC-protocol compatible smartphone or similarly functioning device, and alternatively by an RFID reader utilizing a different protocol capable of supporting efficient high-speed anti-collision features for enabling fast inventorying at item level of retail store items, warehousing, customs and logistics operations over considerably greater interrogation distances, where both protocols utilize substantially the same carrier frequency.