RFID Antenna Assembly for Accurate ULT Shelf Inventory Tracking

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Solution Overview

Problem

Conventional RFID tracking systems in ultra-low temperature (ULT) cold-storage devices are labor-intensive, prone to errors, and lack accuracy in detecting RFID-tagged items, especially in high-density environments, requiring extensive user intervention and suffering from miscommunications and logistical challenges.

Innovation Solution

A cold-storage apparatus equipped with a plurality of shelves, an RFID antenna assembly comprising multiple circularly polarized antenna elements on printed circuit boards, and a controller that individually controls each antenna element to efficiently scan RFID tags at temperatures between −70° C. and −90° C., reducing the need for user intervention and enhancing detection accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual RFID reading is performed by user every time an item is added or removed, then inventory tracking is possible, but labor intensity increases and errors occur

Engineering Contradiction:

Improveinventory tracking accuracyVSAvoiduser intervention requirement

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system enables self-service inventory tracking by automatically scanning RFID tags when container lids are opened or closed. The RFID reader and controller automatically detect tags and update inventory records without requiring manual user intervention, thus improving reliability while reducing operational burden.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system performs preliminary inventory scanning by placing RFID readers inside the cold-storage device that continuously or periodically scan tags before items are actually added or removed. This preliminary detection capability ensures inventory accuracy is maintained automatically without waiting for manual scanning after each operation.

Inventive Principle:

Principle #10Preliminary action

2Extent of automation

If RFID reader antennas are placed in ULT cold-storage device, then automated detection is possible, but detection accuracy is insufficient for high-density environments

Engineering Contradiction:

Improveautomated inventory detectionVSAvoidRFID tag detection accuracy

Core Design Contradiction:

Extent of automationVSMeasurement precision

Solution Approach 1:

The system divides the cold-storage device into multiple zones with multiple RFID reader antennas positioned at different locations. Each reader handles a specific zone, reducing signal interference and improving detection accuracy for individual tags even in high-density storage environments where many items are stored close together.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system uses the container lid as an intermediary mechanism to trigger RFID scanning. When the lid is opened or closed, it activates the RFID readers to scan items, providing a reliable trigger event that ensures scanning occurs at the appropriate moment without requiring continuous operation or complex signal processing in high-density environments.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If multiple RFID antenna elements are used to scan high-density items, then detection coverage improves, but system complexity increases

Engineering Contradiction:

ImproveRFID tag detection coverageVSAvoidantenna assembly structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system merges multiple RFID antenna elements into a single integrated antenna assembly that is positioned inside the cold-storage device. This combined assembly provides comprehensive coverage for high-density item detection while simplifying the overall system structure by consolidating multiple functions into one unit rather than requiring separate antennas throughout the device.

Inventive Principle:

Principle #5Merging (Combining)

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 enables accurate and efficient tracking of RFID-tagged items in ULT environments with reduced errors and logistical delays, maintaining inventory accuracy without extensive user intervention across a wide temperature range.

Implementation Method 1

The RFID antenna assembly can include a plurality of RFID antenna elements (for example, approximately six antenna elements) that can each individually direct a transmission of radio frequenc(ies) towards the shelves

Methodology Applied

Scientific EffectRadio frequency electromagnetic radiation: Electromagnetic Induction

Implementation Method 2

The antenna elements may be circularly polarized

Methodology Applied

Scientific EffectCircular polarization: Polarisation

Data Source

PatentUS9979095B2Radio frequency identification techniques in an ultra-low temperature environment

Publication Date: 2018.05.22 TERSO SOLUTIONS INC

AI summary

According to certain inventive techniques, a system includes a plurality of shelves in an interior chamber of a cold-storage apparatus, an RFID antenna assembly in the cold-storage apparatus, and a controller. Each of the shelves can support items that are connected a corresponding RFID tag. The RFID antenna assembly includes a plurality of RFID antenna elements that direct a transmission of radio frequenc(ies) towards the plurality of shelves. The controller is in communication with the RFID antenna assembly and can individually and separately control each of the RFID antenna elements.