Coil Antenna Shield Layout for Battery Space and Charging Efficiency
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Solution Overview
Problem
The challenge of ensuring sufficient battery space in electronic devices with integrated coil antennas, such as NFC, WPC, and MST, is exacerbated by the thickness increase due to shielding layers that block magnetic fields, limiting the expansion of battery capacity.
Innovation Solution
An electronic device design that blocks magnetic fields in the −Z-axis direction by using a shielding layer and a metal shield to reduce the area of the shielding layer, thereby increasing the battery space while enhancing wireless charging efficiency and recognition area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding layer is applied to block magnetic fields generated from coil antennas, then magnetic field blocking is improved, but the thickness of the antenna coil area and flexible circuit board area increases, reducing battery space
Solution Approach 1:
The shielding layer is divided into multiple segments: a first shielding layer disposed below the coil antenna, and a second shielding layer disposed on the flexible circuit board area. This segmentation allows each shielding layer to be optimized independently, reducing the overall thickness required for magnetic field blocking while maintaining effective shielding performance.
Solution Approach 2:
The shielding structure implements local quality by positioning shielding layers only where magnetic field interference is most critical - specifically below the coil antenna and on the flexible circuit board area - rather than applying uniform shielding throughout the entire device. This localized approach reduces overall thickness while maintaining effective magnetic field blocking where needed.
2Object-affected harmful factors
If the area of shielding layer is increased to improve magnetic field blocking, then magnetic field blocking is improved, but the recognition area and charging efficiency of wireless charging are reduced
Solution Approach 1:
The shielding layer is segmented into a first shielding layer below the coil antenna and a second shielding layer on the flexible circuit board area. This segmentation allows the shielding structure to block magnetic fields effectively while leaving the central wireless charging area open, thereby maintaining both magnetic field blocking performance and wireless charging efficiency.
Solution Approach 2:
The shielding structure applies local quality by concentrating shielding layers at the periphery (below the coil antenna and on the flexible circuit board) while leaving the central wireless charging area without shielding. This localized shielding approach ensures magnetic field blocking where interference is problematic while preserving the recognition area and charging efficiency for wireless power transfer.
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 design effectively blocks magnetic fields, reduces the thickness of the shielding layer, and improves wireless charging efficiency and recognition area, ensuring adequate battery space and functionality in electronic devices.
Implementation Method 1
a metal shield disposed on a side surface of the coil antenna and configured to shield a magnetic field in a first direction among the magnetic fields generated by the coil antenna
Implementation Method 2
a coil antenna disposed inside the housing and including a plurality of antennas on which a conductive pattern is provided to generate magnetic fields
Data Source
AI summary
An electronic device, according to various embodiments of the present disclosure, may comprise: a housing, a first circuit board disposed in the housing; flexible circuit boards electrically connected to the first circuit board, coil antennas disposed inside the housing and including a plurality of antennas having conductive patterns provided and configured to generate magnetic fields, a shielding layer disposed below a first antenna from among the plurality of antennas and metal shields disposed about side surfaces of the coil antennas and configured to shield a magnetic field in a first direction from among magnetic fields formed by the coil antennas.