Segmented Magnetic Antenna for Metal Interference
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Solution Overview
Problem
Conventional magnetic antennas are susceptible to degradation in performance due to demagnetizing fields induced by nearby metals, leading to reduced communication coverage area, especially in the direction perpendicular to the conductive wire winding.
Innovation Solution
An antenna device is designed with a magnetic member unit formed by laying out individual magnetic pieces, which are then sandwiched between resin members and wound with a conductive wire, optimizing the winding direction and spacing to minimize demagnetizing fields and enhance magnetic flux distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive wire is wound around a solid magnetic core, then the antenna becomes less susceptible to metal interference, but the communication coverage area is narrowed in the direction perpendicular to the winding
Solution Approach 1:
The magnetic core is divided into multiple magnetic-member individual pieces arranged in an array. This segmentation allows magnetic flux to penetrate through the gaps between pieces in the winding direction, expanding the effective area for magnetic coupling while maintaining the shielding effect against metal interference.
Solution Approach 2:
The invention transitions from a solid 3D magnetic core to a planar array of discrete magnetic pieces with controlled spacing. This dimensional change creates gaps that allow magnetic flux penetration in the direction perpendicular to the winding, thereby expanding coverage area without compromising reliability.
2Volume of moving object
If a solid magnetic core is used, then the antenna structure is compact, but magnetic flux penetration is restricted in directions perpendicular to the winding
Solution Approach 1:
By segmenting the magnetic core into individual pieces with controlled spacing, the invention creates a structure that maintains compact form factor while allowing magnetic flux to penetrate through the gaps between pieces, thereby increasing the effective magnetic flux penetration area.
Solution Approach 2:
The array of magnetic-member individual pieces creates a porous-like structure with controlled gaps between pieces. These gaps function similarly to porosity, allowing magnetic flux to pass through the structure in directions that would be blocked by a solid core, thus increasing penetration area while maintaining compactness.
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
This configuration reduces the impact of nearby metals on antenna performance and expands the communication coverage area, ensuring effective magnetic coupling communication while maintaining compactness.
Implementation Method 1
magnetic-coupling communication, a representative example of which is NFC (Near Field Communication), is used in mobile information terminals
Implementation Method 2
a magnetic antenna formed by looping a flexible substrate, on which a coil conductor is formed, around and along the surface of a magnetic core
Implementation Method 3
when a metal is present near the antenna, magnetic flux is impeded by a demagnetizing field induced by an eddy current
Data Source
AI summary
An antenna device is formed by winding a conductive wire around a magnetic member unit, and in which the magnetic member unit comprises a plurality of magnetic-member individual pieces.