Segmented Ferrite Sheet Strip for Stable Antenna Resonance
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Solution Overview
Problem
Ferrite sheets are brittle and difficult to form in a strip shape, making them challenging to wind into rolls and apply to antenna devices without affecting resonance frequency and communication range, and their gaps can worsen these properties when overlapping with loop coils.
Innovation Solution
A ferrite sheet strip with a substrate and aligned ferrite pieces spaced by gaps that do not parallel the lateral direction, allowing the gaps to intersect loop coils, reducing resonance frequency variations and improving communication range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ferrite sheet pieces are aligned on a strip shaped substrate to form a strip shaped ferrite sheet, then ease of handling and portability are improved, but gaps between ferrite sheet pieces cause changes in resonance frequency and adverse effects on communication range
Solution Approach 1:
The ferrite sheet strip is divided into multiple ferrite sheet pieces (first, second, third pieces) aligned along the longitudinal direction of the substrate. This segmentation allows the strip to be flexible and easy to handle while maintaining functional integrity through proper gap control.
Solution Approach 2:
The gap between ferrite sheet pieces is positioned to avoid overlapping with the loop coil in the antenna device. By controlling the local position and orientation of gaps away from critical areas, the adverse effects on resonance frequency and communication range are eliminated while preserving the benefits of the segmented structure.
2Ease of operation
If ferrite sheet is formed in a strip shape, then ease of wrapping around cable is improved, but ferrite sheet brittleness makes it difficult to form and wind into rolls
Solution Approach 1:
The ferrite sheet strip consists of multiple ferrite sheet pieces aligned on a flexible substrate. This segmented structure provides flexibility for winding into rolls and wrapping around cables, overcoming the brittleness of continuous ferrite sheets while maintaining the magnetic shielding functionality.
Solution Approach 2:
A strip shaped substrate serves as an intermediary carrier that holds multiple ferrite sheet pieces. The substrate provides flexibility and structural integrity, enabling the brittle ferrite pieces to be formed into a continuous strip shape that can be easily wound and wrapped.
3Ease of manufacture
If gap between ferrite sheet pieces is provided taking account of tolerance of attachment, then ease of assembly is improved, but gap overlapping with loop coil causes resonance frequency variations
Solution Approach 1:
The gap between ferrite sheet pieces is strategically positioned to avoid the loop coil area in antenna devices. By controlling the local placement of gaps in non-critical zones, assembly tolerance is accommodated while preventing adverse effects on resonance frequency and maintaining manufacturing precision.
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 ferrite sheet strip can be wound into rolls, easily applied to antenna devices, and reduces resonance frequency variations and communication range issues, enhancing device performance.
Implementation Method 1
The laminated soft magnetic sheet allows the magnetic flux to have a pathway to pass through, enabling improvement of communication ranges.
Implementation Method 2
When the antenna device is provided near a metal material, such as a metal card, a magnetic flux is converted into an eddy current in the metal to cause problems
Implementation Method 3
An IC tag is commonly known which includes an IC chip and an antenna device electrically connected with the IC chip, and which receives power from a reader/writer and transmits and receives a signal from a reader/writer in a non-contact manner by using an electromagnetic wave.
Data Source
AI summary
A ferrite sheet strip includes a strip shaped substrate and a plurality of ferrite sheet pieces provided on a surface of the substrate. The plurality of ferrite sheet pieces are aligned and spaced apart by a gap from one another along a longitudinal direction of the substrate. The gap extends at least partially so as not to be parallel to a lateral direction of the substrate.