Coil Antenna Magnetic Core Layout for Stronger Coupling
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Solution Overview
Problem
Existing antenna devices require enhancements in antenna characteristics, particularly in coupling efficiency due to magnetic flux interference from closed magnetic paths formed by magnetic cores.
Innovation Solution
The antenna device is configured with an open magnetic path by positioning the magnetic core away from the coil's direct underneath region, allowing the magnetic flux to strengthen the coupling of current loops at the circuit board's periphery with the coil antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnetic core is positioned directly below the coil to form a closed magnetic path, then the magnetic flux is contained within the core, but the coupling between the current-loop at the circuit board periphery and the coil antenna is weakened
Solution Approach 1:
The patent extracts the magnetic core from the position directly below the coil, removing it from the region that would form a closed magnetic path. This extraction allows magnetic flux to extend toward the circuit board periphery, strengthening the coupling between the current-loop and coil antenna while eliminating the harmful effect of weak coupling
Solution Approach 2:
The patent introduces a non-magnetic support structure as an intermediary to hold the magnetic core at a position offset from the coil. This mediator enables the magnetic core to be positioned away from the coil without compromising structural support, allowing the magnetic flux to interact with the circuit board periphery current-loop for enhanced coupling
2Object-generated harmful factors
If the magnetic core is positioned away from the coil's direct underneath region to create an open magnetic path, then the coupling efficiency is enhanced, but the magnetic flux path becomes less contained
Solution Approach 1:
The patent positions the magnetic core laterally offset from the coil rather than directly below it, changing the spatial arrangement from a vertical alignment to a lateral offset configuration. This dimensional change creates an open magnetic path that allows flux to extend to the circuit board periphery, enhancing coupling efficiency while maintaining controlled flux distribution through the offset geometry
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 enhances the antenna's coupling efficiency by ensuring the magnetic core is positioned outside the coil's direct underneath region, thereby improving the overall antenna characteristics.
Implementation Method 1
the magnetic core partially forms a magnetic path of the coil
Implementation Method 2
magnetic flux generated by a coil passes in a closed magnetic path formed by a magnetic core
Implementation Method 3
the coil antenna comprises a coil and a magnetic core; the coil has a winding axis extending in the up-down direction
Data Source
AI summary
An antenna device includes a circuit board, a coil antenna and a resonance circuit. The circuit board has a conductive portion with a flat shape. The conductive portion is formed with an opening and a slit. The slit is coupled with the opening. The coil antenna is mounted on the circuit board so that the coil antenna at least overlaps with the opening when the coil antenna is viewed along an up-down direction perpendicular to the circuit board. The coil antenna includes a coil and a magnetic core. The magnetic core partially forms a magnetic path of the coil. The magnetic core is positioned at a region excluding a specific region which is positioned just below the coil. The magnetic core at least has a center core. The center core is at least partially positioned inside the coil.