RFID Reader Tunnel Focusing for Garment Inventory Accuracy
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Solution Overview
Problem
The close proximity of RFID-tagged garments on hangers in trolley and rail systems makes it difficult for RFID readers to accurately interrogate individual items, leading to challenges in inventory control and increased labor costs.
Innovation Solution
An RFID garment on hanger reader with a self-standing rugged industrial metal housing and a tunnel configuration that focuses RF signals to prevent activation of nearby RFID tags, allowing for accurate scanning of individual garments or clusters as they pass through.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If garments are transported in tightly interwoven trolley and rail systems with items in close proximity, then productivity and space utilization are improved, but RFID interrogation accuracy deteriorates due to difficulty in activating individual RFID tags
Solution Approach 1:
The patent applies local quality by creating a focused RF field within the tunnel structure that concentrates electromagnetic energy in a specific localized region. This allows the RFID reader to selectively activate only the RFID tag of the target garment within the tunnel, while garments outside the tunnel or in adjacent positions remain unaffected. The tunnel structure with its specific geometry and RF field distribution creates a localized interrogation zone that resolves the contradiction between handling multiple garments in close proximity and accurately reading individual tags.
2Speed
If RFID readers use high power to activate distant RFID tags, then reading range is improved, but nearby RFID tags are accidentally activated causing interference
Solution Approach 1:
The patent extracts the harmful effect of wide-area RF radiation by confining the RF field within the tunnel structure. The tunnel acts as a waveguide or resonant structure that channels and contains the electromagnetic energy, preventing it from spreading to activate nearby RFID tags. This allows the system to use sufficient RF power to activate the target RFID tag at the desired reading range while the tunnel structure prevents the harmful side effect of accidentally activating other tags in proximity.
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 solution enables efficient and accurate inventorying of garments on hangers with reduced manpower costs, minimizing damage to garments and improving scanning accuracy by focusing RF fields within the tunnel.
Implementation Method 1
The RFID chip receives power when excited by a nearby electromagnetic field oscillating at the resonant frequency of the RFID chip
Implementation Method 2
An RFID reader configured to read RFID tags attached to garments on hangers includes a housing with an interior tunnel and an antenna coupled to a transmitter. The transmitter is configured to transmit radio frequency (RF) signals that focus within the interior tunnel of the housing
Data Source
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AI summary
A radio frequency identification (RFID) apparatus includes a housing, an RFID reader, and one or more RFID antennas disposed in the housing. The housing includes a first opening, a second opening, and a tunnel between the first and second openings. The housing is configured to be disposed over a track configured to transport a garment on hanger through the tunnel. The RFID antennas are configured to generate a first RFID signal substantially in the tunnel to interrogate an RFID tag associated with a garment on hanger as it transits through the tunnel. The RFID reader receives a second RFID signal transmitted by the RFID tag in response to receiving the first RFID signal. The RFID apparatus can include a segment of the track. The track can include a trolley configured to secure one or more garments on hangers. The trolley can include an RFID tag.