Embedded RFID Reader Layout for Through-Medium Tag Interrogation
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Solution Overview
Problem
Conventional RFID systems face challenges in effective communication between an RFID interrogator and tags separated by non-absorbing mediums, such as rubber, due to altered electromagnetic wave propagation properties.
Innovation Solution
An RFID tag reading apparatus and method utilizing a serial bus to connect a microcontroller to a reader, with multiple interrogator rings and antenna modules positioned over tags, forming a node-gateway configuration to enable communication and power distribution via a serial bus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional RFID systems use a single reader for one tag at a time, then the system complexity is low, but the productivity decreases when multiple tags are separated by non-absorbing mediums
Solution Approach 1:
The system divides the reading function into multiple independent interrogator rings, each capable of reading tags individually. This segmentation allows parallel processing of multiple tags simultaneously, improving productivity without requiring a completely new system architecture - each ring operates as an independent unit that can be controlled separately
Solution Approach 2:
The patent introduces a spatial dimension by positioning multiple interrogator rings at different locations around the medium. Instead of one reader attempting to read multiple tags from a single position, the system distributes readers across multiple spatial positions, enabling simultaneous reading of multiple tags separated by non-absorbing mediums
2Measurement precision
If multiple antenna modules are positioned over RFID tags, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
Each antenna module is paired with its own dedicated interrogator ring and field controller, creating segmented reading units. This segmentation allows each module to be optimized for precise reading of its specific tag while maintaining independence from other modules, thus achieving high measurement precision without requiring complex coordination between multiple readers
Solution Approach 2:
The system provides localized control and optimization for each antenna-module-tag combination. Each interrogator ring can be independently positioned and configured to center over a specific tag, ensuring optimal reading conditions for that particular location while leaving other modules unchanged
3Adaptability or versatility
If a serial bus connects multiple interrogator rings in a node-gateway configuration, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The serial bus communication architecture serves multiple functions simultaneously: it provides centralized control of the interrogator rings, enables data collection from all rings, facilitates power distribution, and allows configuration of each ring. This multi-functionality achieves high adaptability without requiring separate dedicated systems for each function
Solution Approach 2:
The serial bus acts as an intermediary communication layer between the host device and the distributed interrogator rings. This intermediary structure simplifies the overall system architecture by providing a standardized communication protocol that handles multiple tasks (control, data, power) through a single communication channel, rather than requiring direct complex interconnections between all components
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
Enables effective RFID tag reading through non-absorbing mediums by ensuring proper positioning and power supply to multiple tags, enhancing communication efficiency and reliability.
Implementation Method 1
RFID is a form of wireless communication that incorporates the use of electromagnetic coupling in the radio frequency portion of the electromagnetic spectrum to uniquely identify an object
Implementation Method 2
RFID is a form of wireless communication that incorporates the use of electromagnetic coupling in the radio frequency portion of the electromagnetic spectrum to uniquely identify an object
Data Source
AI summary
A method and apparatus are set forth for reading RFID tags through a medium, comprising positioning a plurality of interrogator rings in relation to the medium, each interrogator ring having a field controller connected to a plurality of antenna modules, wherein each of the antenna modules is positioned over a respective RFID tag, and connecting the host device and plurality of interrogator rings in a node-gateway configuration over a serial bus to enable the host device to communicate with and provide power to each field controller for interrogating the RFID tags via the plurality of antenna modules.