Magnetic Loop Antenna Arrangement with Flux-Guiding Layer
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Solution Overview
Problem
Magnetic loop antennas in mobile devices require significant space, contributing to the device's thickness and causing issues with eddy currents that deteriorate performance, especially when integrated with existing elements like camera holders.
Innovation Solution
A magnetic loop antenna arrangement where a magnetic material layer is applied between the antenna coil and the outer surface of the device casing, preventing eddy currents and optimizing magnetic field alignment, allowing the antenna to be integrated without increasing device thickness and enhancing coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a magnetic loop antenna is integrated into a mobile device, then wireless charging and NFC capabilities are enabled, but the device thickness significantly increases
Solution Approach 1:
The patent combines the magnetic loop antenna with the camera holder structure, integrating two separate components (antenna and camera mounting) into a single unified structure. This merging eliminates the need for separate antenna space, thereby preventing additional thickness while enabling wireless charging capability
Solution Approach 2:
The camera holder structure is designed to serve dual purposes: it functions as both a mechanical mounting structure for the camera and as the housing for the magnetic loop antenna. This multi-functionality allows the same structural element to support both optical and wireless charging functions without increasing overall device dimensions
2Adaptability or versatility
If a magnetic loop antenna is placed inside the mobile device, then wireless charging is enabled, but eddy currents deteriorate antenna performance
Solution Approach 1:
The patent introduces a magnetic material layer as an intermediary between the metal back cover and the magnetic loop antenna. This intermediate layer acts as a shield that blocks eddy currents generated by the metal back cover, thereby protecting the antenna performance while allowing the antenna to be positioned close to the back cover for compact design
Solution Approach 2:
The patent converts the potentially harmful effect of the metal back cover (which generates eddy currents that deteriorate antenna performance) into a beneficial configuration by positioning the antenna on the inner surface of the back cover and using a magnetic material layer to manage the electromagnetic interaction. This allows the metal back cover to maintain its structural and aesthetic functions while the antenna performance is protected
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 solution effectively integrates the magnetic loop antenna without adding thickness, improves magnetic field alignment, and enhances coupling efficiency, addressing performance issues related to eddy currents and space constraints.
Implementation Method 1
a magnetic material layer is applied between the antenna coil and the outer surface of the device casing, preventing eddy currents and optimizing magnetic field alignment
Implementation Method 2
a magnetic material layer is applied between the antenna coil and the outer surface of the device casing, preventing eddy currents
Data Source
Figure 1A~1H
Figure 2A~3A
Figure 3B~4A
AI summary
An antenna arrangement comprises a casing comprising a flange and a collar extending upwards from the flange. A magnetic loop antenna coil covers an outer surface of at least one of the flange and the collar at least partly. A magnetic material layer is arranged between the magnetic loop antenna coil and the outer surface of the flange and the collar to guide the magnetic flux generated by the magnetic loop antenna coil, the magnetic material layer covering both the flange and the collar at least partly.