Multi-mode RFID Tag Configurable Coupling Circuit
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Solution Overview
Problem
The widespread use of RFID tags is hindered by the need for multiple technologies and standards, limiting their application due to the lack of a highly integrated, low-cost, multi-standard, multi-technology RFID tag that can efficiently operate in both near-field and far-field modes.
Innovation Solution
A multi-mode RFID tag with a configurable coupling circuit and antenna section that can switch between near-field and far-field modes, utilizing a power generating and signal detection module, baseband processing module, and transmit section to communicate using different protocols and frequencies, enabling compatibility with various RFID readers and applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single RFID tag is designed to support multiple technologies and standards, then adaptability and versatility improve, but device complexity increases
Solution Approach 1:
The RFID tag is designed with a universal architecture that can operate in both near-field and far-field modes, supporting multiple communication standards (ISO 14443, ISO 15693, ISO 18000-6) through a single device. The tag includes configurable coupling circuits that can be set to different modes depending on the required standard, eliminating the need for separate specialized tags for each application.
Solution Approach 2:
The RFID tag incorporates dynamically configurable coupling circuits that can switch between different operating modes (near-field and far-field) based on the communication requirements. This dynamic reconfigurability allows the same hardware to adapt to different standards and operating conditions, resolving the contradiction between versatility and complexity by providing mode-selectable functionality rather than requiring separate fixed-architecture tags for each standard.
2Reliability
If separate tags are used for near-field and far-field applications, then reliability for specific applications improves, but device complexity and variety increase
Solution Approach 1:
The invention merges the functionality of separate near-field and far-field RFID tags into a single multi-mode device. The tag integrates both near-field coupling circuits (for contactless smart card applications) and far-field coupling circuits (for RFID reader applications) within one unit, allowing it to replace multiple specialized tags while maintaining application-specific reliability through mode selection.
Solution Approach 2:
A single RFID tag design provides universal functionality across different application domains by supporting both near-field and far-field communication modes. The configurable coupling circuits enable the tag to reliably perform in specific applications (access control, inventory management, etc.) while eliminating the need to deploy and manage multiple different tag types.
3Ease of manufacture
If RFID tags are highly integrated with all functional modules on a chip, then manufacturing cost and ease of manufacture improve, but device complexity increases
Solution Approach 1:
The RFID tag employs a nested architecture where the core identification and data storage functions are integrated on a chip, while the coupling circuits (both near-field and far-field) are implemented as additional integrated modules that can be selectively activated. This nesting approach allows high-level integration with multiple functional blocks on a single chip while managing complexity through hierarchical organization of functions.
Solution Approach 2:
The integrated chip design includes dynamically configurable coupling circuits that can be programmed or switched to enable different operating modes. This dynamic configuration capability is implemented through integrated control logic on the chip itself, allowing the highly integrated device to manage its own complexity through software or hardware-controlled mode selection, thereby achieving both high integration and manageable complexity.
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 multi-mode RFID tag provides a cost-effective solution for multiple applications by seamlessly transitioning between near-field and far-field modes, enhancing compatibility and reducing the need for multiple tags, thus expanding RFID system capabilities.
Implementation Method 1
For passive tags without a battery or other power source, the RFID reader also generates an unmodulated, continuous wave (CW) signal to activate and power the tag during data transfer. Thus, passive tags obtain power from transmissions of the RFID reader.
Implementation Method 2
One or more of the tags that receive the RF signal responds to the reader using a backscattering technique in which the tags modulate and reflect the received RF signal.
Implementation Method 3
In near field applications, the RFID reader and tag communicate via electromagnetic or inductive coupling between the coils of the reader and the tag.
Implementation Method 4
In near field applications, the RFID reader and tag communicate via electromagnetic or inductive coupling between the coils of the reader and the tag.
Data Source
AI summary
A multi-mode RFID tag includes a power generating and signal detection module, a baseband processing module, a transmit section, a configurable coupling circuit, and an antenna section. In near field mode, the configurable coupling circuit is operable to couple the transmit section to a coil or inductor in the configurable coupling circuit to transmit an outbound transmit signal using electromagnetic or inductive coupling to an RFID reader. In far field mode, the configurable coupling circuit is operable to couple the transmit section to the antenna section, and the multi-mode RFID tag then utilizes a back-scattering RF technology to transmit the outbound transmit signal to RFID readers.