Non-contact IC Label with Magnetic Sheet and Segmented Antenna
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Solution Overview
Problem
Non-contact IC labels using radio waves in the UHF and SHF bands face challenges with communication range and compatibility with metal objects, and existing solutions either compromise on performance or increase cost.
Innovation Solution
A non-contact IC label design featuring a magnetic sheet with integrated antenna sections and auxiliary antenna elements, which enhance communication range without increasing external dimensions or cost, by using a magnetic sheet with an IC chip, antenna sections, and auxiliary elements formed in specific shapes to improve radio wave communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic sheet is disposed between the antenna and the object to be adhered to ensure magnetic flux route with reduced loss, then communication performance is improved, but the communication range is insufficient
Solution Approach 1:
The antenna is divided into multiple sections (first antenna section and second antenna section) with different orientations. The first antenna section extends in a first direction while the second antenna section extends in a second direction, allowing the tag to communicate effectively with readers approaching from different directions, thereby extending the effective communication range.
Solution Approach 2:
Different portions of the antenna structure are designed with different orientations and configurations. The first antenna section is optimized for signals from one direction while the second antenna section is optimized for signals from another direction, ensuring reliable communication performance regardless of the reader's approach angle.
2Length of stationary object
If the thickness of the magnetic body is reduced to manufacture thin RFID tags, then the tag becomes thinner and more versatile, but the communication range and performance are further compromised
Solution Approach 1:
Instead of relying solely on increasing magnetic body thickness to improve communication range, the invention transitions to a planar solution by implementing multi-directional antenna sections. The antenna structure compensates for the reduced magnetic body thickness by optimizing the electromagnetic field distribution in the horizontal plane through multi-directional radiation patterns.
3Object-affected harmful factors
If a dielectric body or air layer is disposed between the antenna and the object to be adhered to ensure a gap, then the effect of the metal object is reduced, but communication is still failed when the gap is only 100 μm
Solution Approach 1:
The magnetic sheet serves as an intermediary layer between the antenna and the metal object. It provides magnetic flux guidance and shielding, reducing the harmful effects of the metal object on communication while maintaining a thin overall structure without requiring additional dielectric bodies or air gaps.
4Length of moving object
If antenna sections are arranged in specific shapes to improve communication range, then communication performance is enhanced, but the external dimensions and manufacturing complexity may increase
Solution Approach 1:
The first and second antenna sections are integrated into a single magnetic sheet substrate, sharing common connection points and magnetic flux paths. This merging approach achieves multi-directional radiation patterns while minimizing the overall structure size and reducing manufacturing complexity compared to separate antenna assemblies.
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 proposed design improves communication range while maintaining the external dimensions and preventing cost increases, effectively addressing the limitations of existing non-contact IC labels on metal objects.
Implementation Method 1
a magnetic body (magnetic sheet) having high magnetic permeability is disposed between an antenna and an object to be adhered. Accordingly, the RFID tags can ensure a magnetic flux route between the antenna and the object to be adhered with reduced loss
Implementation Method 2
wireless communication is performed between an RFID tag (non-contact IC label) and a reader or the like using radio waves in the UHF band and the SHF band
Data Source
AI summary
A non-contact IC label of the present invention includes an IC chip disposed on a magnetic sheet, a first antenna section and a second antenna section each connected to the IC chip, a circuit section which connects a first end portion of the first antenna section and a first end portion of the second antenna section to the IC chip, a first auxiliary antenna section which is disposed to project from a side on the second end portion of the first antenna section and a second auxiliary antenna section which is disposed to project from a side on the second end portion of the second antenna section, wherein the first antenna section and the second antenna section are formed in the same rectangular shape in a plan view.