Antenna Device Asymmetric Coil Nesting for Unwanted Coupling
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Solution Overview
Problem
Existing antenna devices with combined non-contact charging and NFC coils suffer from unwanted coupling, leading to interference and degraded performance due to similar directivity and overlapping magnetic paths.
Innovation Solution
The design features a first system coil antenna with a distinct winding axis direction compared to a second system coil antenna, positioning the second coil conductor within the first coil's opening to minimize coupling, and using magnetic bodies to enhance coupling efficiency while maintaining compact size and reducing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coil for non-contact charging and the coil for the NFC antenna are disposed on the same surface in a planar shape, then the module size is reduced, but unwanted coupling between the coils increases
Solution Approach 1:
The patent applies asymmetry by making the NFC antenna coil smaller than the non-contact charging coil and positioning it asymmetrically within the charging coil's formation region. This asymmetric configuration reduces the overlapping area between the two coils, thereby minimizing unwanted coupling while maintaining a compact module size.
Solution Approach 2:
The patent implements the nesting principle by placing the NFC antenna coil inside the formation region of the non-contact charging coil. The second coil conductor is positioned within the first coil opening, creating a nested structure that saves space while controlling interference through proper geometric arrangement.
2Object-generated harmful factors
If the coil for the NFC antenna is made smaller to reduce unwanted coupling, then coupling interference is reduced, but NFC performance is degraded
Solution Approach 1:
The patent applies local quality by using a magnetic body with high magnetic permeability positioned at specific locations to concentrate and guide magnetic flux through the NFC antenna coil. This localized magnetic field enhancement improves NFC performance without requiring the coil to be larger, thus maintaining small size while reducing unwanted coupling.
Solution Approach 2:
The patent changes physical parameters by introducing a magnetic body that alters the magnetic field distribution. The magnetic body modifies the magnetic permeability in specific regions, enhancing the magnetic flux linkage with the NFC antenna coil and improving coupling efficiency without increasing the coil size.
3Object-generated harmful factors
If the winding axis directions of the two coils are made different to reduce interference, then unwanted coupling is reduced, but the directivity control becomes more complex
Solution Approach 1:
The patent employs asymmetry by setting the winding axis of the NFC antenna coil perpendicular to the winding axis of the non-contact charging coil. This asymmetric orientation causes the magnetic field lines of one coil to pass through the plane of the other coil rather than linking with it, significantly reducing unwanted coupling while maintaining simple directivity control.
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 effectively reduces unwanted coupling between the coils, improving performance by minimizing interference and allowing for efficient power transmission and communication without electromagnetic radiation loss.
Implementation Method 1
a first system coil antenna (101) including a first coil conductor (11) wound around a first winding axis (AX1)... a second system coil antenna (201) including a second coil conductor (21) wound around a second winding axis (AX2)
Implementation Method 2
both of which include magnetic bodies (13, 23)
Data Source
AI summary
An antenna device includes a first system coil antenna including a first coil conductor wound around a first winding axis, a first coil opening surrounded by the first coil conductor, and a first magnetic body; and a second system coil antenna including a second coil conductor wound around a second winding axis extending in a direction different from a direction in which the first winding axis extends, and a second coil opening surrounded by the second coil conductor. The second coil conductor is in a formation region of the first coil conductor and the first coil opening in the second winding axis direction when viewed from the first winding axis direction.