RFID Tag Powering via Multi-Reader Beam Coordination
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Solution Overview
Problem
RFID systems face limitations in effectively powering and interrogating RFID tags, especially in scenarios where the tag's power requirements exceed the capabilities of a single reader, leading to reduced interrogation range and efficiency.
Innovation Solution
The use of multiple synthesized-beam RFID readers, where one reader transmits commands and receives responses while another reader provides unmodulated or minimally modulated RF power to boost the tag's power, extending the interrogation range and improving performance by directing multiple beams to a common location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single RFID reader transmits both commands and power, then the system structure is simple, but the interrogation range is limited and power delivery is insufficient for tags with high power requirements
Solution Approach 1:
The patent divides the RFID reader system into multiple independent readers, where each reader can be specialized for specific functions (command transmission, power delivery, or both). This segmentation allows the system to deliver sufficient power to tags while maintaining operational simplicity through modular deployment
Solution Approach 2:
Each RFID reader in the system is designed to be multi-functional, capable of transmitting both commands and power simultaneously or independently. This universality allows flexible configuration where readers can adapt to different operational requirements without adding system complexity
2Length of stationary object
If multiple RFID readers are deployed to extend interrogation range, then power delivery and range are improved, but system complexity and coordination difficulty increase
Solution Approach 1:
The patent combines multiple RFID readers into a coordinated network that operates as a unified system. By merging the capabilities of individual readers and implementing centralized or distributed coordination, the system achieves extended interrogation range while managing complexity through integrated control mechanisms
Solution Approach 2:
The system introduces coordination mechanisms (such as centralized controllers or communication protocols) that act as intermediaries between multiple readers. These intermediaries manage power distribution, command routing, and synchronization, enabling extended range operation without proportionally increasing system complexity
3Reliability
If one RFID reader transmits commands and another transmits power, then power delivery is optimized, but synchronization and coordination become more difficult
Solution Approach 1:
The system performs preliminary coordination and synchronization setup between readers before actual tag interrogation begins. Power delivery parameters, timing sequences, and command protocols are pre-configured and validated, ensuring reliable tag power supply while simplifying real-time operation through advance preparation
Solution Approach 2:
The system implements feedback mechanisms where readers continuously monitor tag power reception status and command transmission effectiveness. Based on this feedback, the coordination system dynamically adjusts power levels, timing, and signal parameters, maintaining reliable tag operation while adapting to changing conditions without manual intervention
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 approach enhances the interrogation range and performance of RFID systems by providing additional power to tags, allowing for more reliable and efficient identification and tracking of RFID tags, even in challenging environments.
Implementation Method 1
The RF wave is typically electromagnetic, at least in the far field. A tag that senses the interrogating RF wave may respond by transmitting back another RF wave.
Implementation Method 2
A tag that senses the interrogating RF wave may respond by transmitting back another RF wave. The tag either generates the transmitted back RF wave originally, or by reflecting back a portion of the interrogating RF wave in a process known as backscatter.
Data Source
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Figure 3
Figure 4~5B
AI summary
The invention relates to a method for a Radio Frequency Identification (RFID) reader to inventory an RFID integrated circuit (IC) coupled to an antenna, the method comprising indicating, to a network, a target location, wherein the indicating causes a first beam to be directed to the target location, generating a second beam directed to the target location, transmitting, on the second beam, a first inventory command, while a first cooperative-powering RF signal is transmitted to the target location via the first beam, receiving, responsive to the first inventory command, a reply from the IC, and transmitting, on the first beam, a first acknowledgment signal responsive to the IC reply. The invention also relates to a method for a Radio Frequency Identification (RFID) reader coupled to a network to assist in inventorying an RFID integrated circuit (IC) coupled to an antenna.