Shielded Coil Antenna for Precise IC Tag Positioning
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Solution Overview
Problem
Conventional IC tag reading devices with loop antennas face challenges in accurately determining the position of an IC tag due to a wide detection range and limited positional relationship, especially in thoracoscopy, and are costly due to the need for disposable tools.
Innovation Solution
A reading device antenna with a coil portion and a shield portion that biases the magnetic flux, using a ferrite core and a magnetic sheet with iron oxide, allowing for precise IC tag positioning and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a loop antenna is used for the reading device, then the detection range becomes wide, but the ability to determine the relative position of the IC tag to the reading device antenna deteriorates
Solution Approach 1:
A shield portion is provided on one side of the coil portion, creating an asymmetric structure that generates non-uniform magnetic flux distribution. This asymmetry causes the magnetic flux to be concentrated on the side opposite to the shield portion, enabling determination of the relative position of the IC tag while maintaining an adequate detection range.
2Device complexity
If the reading device antenna is moved at a chest wall as a fulcrum in thoracoscopy, then the device structure is simplified, but the positional relationship between the lesion with IC tag and the reading device antenna is limited
Solution Approach 1:
The shield portion is positioned at a specific location (at least approximately half of the coil portion in the circumferential direction) to create a localized magnetic flux bias. This local modification allows the antenna to maintain its simple fulcrum-based movement structure while providing directional sensitivity that enables accurate position determination within the limited movement range.
3Reliability
If single-use disposable tools are used for lesion determination in thoracoscopy, then sterilization safety is improved, but manufacturing costs increase
Solution Approach 1:
The reading device antenna is designed with a simple structure consisting of a coil portion and a shield portion, making it suitable for disposable use. The antenna can be manufactured at low cost using conventional techniques, allowing it to be used as a single-use tool that eliminates sterilization requirements while maintaining safety and reliability.
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 biased magnetic flux enables accurate IC tag positioning even with limited movement range, such as in thoracoscopy, while the design allows for cost-effective and disposable antenna construction without additional components.
Implementation Method 1
a coil portion having a coil with a predetermined number of turns in a circumferential direction
Implementation Method 2
a shield portion that covers at least an approximately half of the coil portion in the circumferential direction and causes a bias in a magnetic flux generated from the coil
Implementation Method 3
the coil portion preferably has a ferrite core inserted therein along an axial direction
Implementation Method 4
the magnetic sheet preferably contains iron oxide
Data Source
AI summary
An IC tag reading device is provided that has increased directivity and is capable of determining an accurate position of an IC tag inserted into and placed in a human body even when the operation range of the antenna of the reading device is limited, such as in thoracoscopy, without causing reduction in detectable distance. A reading device antenna for reading an IC tag that has been inserted into a human body and placed at a certain position in order to locate a lesion includes a coil portion having a coil with a predetermined number of turns in a circumferential direction, and a shield portion that covers at least an approximately half of the coil portion in the circumferential direction and causes a bias in a magnetic flux generated from the coil.