Basket RFID Reader with Helical Antenna for Stacked Item Detection
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Solution Overview
Problem
Current POS systems face difficulties in reading RFID tags in shopping baskets due to stacked items or metal-containing packages, which degrade antenna radiation characteristics, making it challenging to manage inventory accurately.
Innovation Solution
A basket with a reader device equipped with a ground radiation type cable-like antenna, arranged in a circling manner around the axis passing through the opening portion, enhances RFID tag readability by improving antenna radiation and reducing interference from metal objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a reader device with antenna is attached to a shopping basket to manage tagged items, then item management capability is improved, but reading accuracy deteriorates when items are stacked or contain metal
Solution Approach 1:
The patent transitions from a planar antenna configuration to a three-dimensional helical antenna structure. The helical antenna extends vertically along the basket handle, creating multiple radiation zones at different heights and angles, which improves signal penetration through stacked items and reduces metal interference by radiating from multiple spatial positions.
Solution Approach 2:
The patent employs a helical (curved) antenna structure instead of a straight or planar antenna. The helical configuration creates a three-dimensional radiation pattern that envelops the basket contents from multiple angles, improving RFID tag detection accuracy by eliminating dead zones and reducing the impact of metal objects that might block linear signal paths.
2Quantity of substance
If items are stacked in the shopping basket, then shopping capacity is improved, but RFID tag readability deteriorates due to degraded antenna radiation characteristics
Solution Approach 1:
The helical antenna structure distributes radiation energy vertically and radially throughout the basket volume, creating multiple detection zones that can penetrate through stacked items. This three-dimensional radiation pattern ensures that tags at various depths and positions within the stack remain readable.
Solution Approach 2:
The reader device continuously monitors RFID tags as items are placed in the basket, maintaining real-time inventory awareness. The system proactively detects and tracks items before they become lost or mismanaged, ensuring continuous readability even as the basket contents change dynamically.
3Adaptability or versatility
If metal-containing packages are placed in the basket, then product variety is improved, but antenna radiation characteristics deteriorate making tag reading difficult
Solution Approach 1:
The helical antenna's curved structure creates a three-dimensional radiation pattern that surrounds the basket contents from multiple angles. This configuration reduces the impact of metal objects by providing alternative signal paths that can bypass metal interference, maintaining reading capability for metal-containing packages.
Solution Approach 2:
The patent optimizes the helical antenna's geometric parameters (turns, diameter, pitch, and length) to maximize radiation efficiency and minimize the impact of metal interference. By adjusting these parameters, the antenna maintains effective radiation characteristics even in the presence of metal-containing products.
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 allows for reliable and accurate reading of RFID tags in stacked or metal-containing items, improving inventory management and real-time stock tracking, even when items are placed in baskets.
Implementation Method 1
a cable-like antenna having one end connected to the RFIC element, wherein the cable-like antenna is a ground radiation type cable-like antenna
Data Source
AI summary
A basket with a reader device including a basket main body that receives an article including an RFID tag having a dipole antenna attached thereto, and a reader device disposed on the basket main body and that reads the RFID tag. The reader device includes an RFIC element, and a cable-like antenna with one end connected to the RFIC element. The cable-like antenna is a ground radiation type cable-like antenna and the cable-like antenna is arranged in a circling manner around an axis passing through an opening portion of the basket main body.