RFID Reader With Distributed Read Structure
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Solution Overview
Problem
Current RFID systems face inefficiencies in communication with RFID devices, particularly in improving data retrieval speed and reliability, especially for passive tags that rely on excitation signals for data transmission.
Innovation Solution
The implementation of a portable RFID reader with a distributed read structure that utilizes proximity or near field coupling through a coupler, allowing for efficient communication with RFID devices without direct electrical connections, and the ability to switch between near field and far field communication modes using separate antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional RFID reader directly communicates with RFID devices, then the system structure is simple, but the data retrieval speed and reliability are insufficient
Solution Approach 1:
The patent introduces a distributed read structure as an intermediary component between the RFID reader and RFID devices. This read structure includes multiple read elements distributed across the target area, which relay communication signals between the reader and tags, thereby improving data retrieval reliability without requiring direct communication between the reader and all devices
Solution Approach 2:
The patent divides the traditional single-point reader structure into a distributed network of multiple read elements. Each read element can independently communicate with RFID devices in its local area, and results are aggregated by a controller, thereby improving overall system reliability through distributed architecture
2Productivity
If passive RFID tags are used, then the device complexity is reduced, but the communication efficiency and data retrieval speed decrease
Solution Approach 1:
The distributed read structure performs preliminary signal processing and amplification before transmitting to individual RFID tags. By pre-conditioning the excitation signals through the distributed read elements, the system improves communication efficiency with passive tags without requiring excessive energy from the reader itself
3Reliability
If a single antenna is used for both near field and far field communication, then the device complexity is low, but the communication performance in both modes is compromised
Solution Approach 1:
The patent separates the antenna system into distinct near-field and far-field antennas. The near-field antenna is optimized for proximity coupling with the distributed read structure, while the far-field antenna handles long-range communication, allowing each antenna to be optimized for its specific function without compromise
Solution Approach 2:
The system maintains multi-functionality by implementing both near-field and far-field communication capabilities through separate antenna systems. This allows the RFID reader to adaptively switch between communication modes depending on the distance to targets, providing universal communication coverage
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 enhances data retrieval speed and reliability by enabling faster and more reliable communication with RFID devices, particularly in proximity or near field modes, while maintaining the capability for far field communication, thus improving overall system efficiency.
Implementation Method 1
an RFID reader communicates by proximity coupling or near field coupling, with a coupler that is connected to a distributed read structure
Implementation Method 2
the RFID reader and the distributed read structure communicate by proximity coupling or near field coupling
Data Source
AI summary
A radio frequency identification (RFID) system includes a portable RFID reader, and a read infrastructure that includes a distributed read structure, which may be part of a display (such as a shelf) for holding objects. The read structure is used to couple the RFID reader to RFID devices (tabs and/or labels) on or near the structure. The RFID reader and the read structure communicate in a near field or proximity region communication, without any use of a direct ohmic electrical connection. The RFID reader may have an antenna that is configured for near field or proximity communication with a coupler of the read infrastructure. The RFID reader may also have a separate antenna for use in far field communication. The RFID reader may be able to obtain information more efficiently in the near field or proximity mode, allowing information to be received faster and with greater reliability.