RF Antenna Sequencing for Collision-Free Article Tracking
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Solution Overview
Problem
Existing article tracking technologies, such as RFID, UHF, and BLE, face challenges when multiple articles are positioned in close proximity, leading to RFID collisions and increased costs, especially with UHF readers, and BLE tags being too large for smaller items.
Innovation Solution
A system using passive RF tags with a sequence-powered RF antenna array to receive signals from each tag at different times, reducing collisions and enabling accurate tracking of articles in a storage compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple RF tags are positioned in close proximity for tracking multiple articles, then article tracking capability is improved, but RFID collision occurs making it impossible to differentiate individual tag signals
Solution Approach 1:
The patent divides the simultaneous signal reception problem into sequential time slots by assigning each RF antenna a specific time window for transmitting and receiving signals. This temporal segmentation allows multiple tags in close proximity to be read individually without collision, as each tag is activated in its designated time slot rather than simultaneously.
Solution Approach 2:
The system implements periodic action by cycling through multiple RF antennas in a repeating sequence, where each antenna is activated for a specific duration to read its associated tag. This periodic activation pattern ensures that signals from multiple tags are received at different times, preventing collision while maintaining continuous tracking capability across all articles.
2Length of stationary object
If UHF technology is used to track articles at larger distances, then tracking range is improved, but device cost increases significantly
Solution Approach 1:
The patent uses a lower-frequency RFID system (copying the functionality of more expensive UHF systems) that can be implemented with cheaper readers and tags. By optimizing the antenna array configuration and using sequential activation, the system achieves reliable tracking at practical distances without requiring expensive UHF infrastructure, thus copying the essential functionality at reduced cost.
3Quantity of substance
If BLE tags are used for article tracking, then tracking capability is improved, but tag size becomes too large for small articles
Solution Approach 1:
The patent employs inexpensive, disposable RFID tags that can be made extremely small and attached to even the tiniest articles. These simple passive tags replace complex, larger BLE tags, providing sufficient tracking functionality for the application while being small enough to attach to small items like jewelry or components without adding noticeable size or cost.
4Device complexity
If manual checking is used to determine article presence, then system complexity is reduced, but labor intensity and inefficiency increase
Solution Approach 1:
The system implements self-service by automatically detecting and tracking article presence through the RF antenna array and sequential reading process. The processor autonomously determines which articles are present or absent based on received signals, eliminating the need for manual checking while maintaining system simplicity. This automated self-monitoring significantly improves productivity without requiring complex additional infrastructure.
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 system effectively determines which articles are present or absent in the compartment by minimizing RFID collisions and optimizing tag recognition, providing efficient and cost-effective tracking with reduced power consumption.
Implementation Method 1
A passive tag can be positioned on each article to be tracked. The RF reader can be configured to provide power to the plurality of RF antennas in sequence. Each RF antenna can then transmit an RF wave to the passive tag associated with a respective article.
Data Source
AI summary
A system for tracking a plurality of articles in a storage compartment. Each of the plurality of articles is associated with a respective passive radio frequency, RF, tag. The system comprises a plurality of RF antennas, each RF antenna for receiving a signal from a respective passive RF tag. The system further comprises an RF reader configured to provide power to the plurality of RF antennas in sequence, and receive, from one or more of the plurality of RF antennas, response data corresponding to one or more signals received from one or more of the plurality of RF tags. The system additionally comprises a processor configured to determine whether a first article of the plurality of articles is located in the storage compartment based on the response data.