Coil Antenna Side Shielding for Thin Wireless Charging Layouts
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Solution Overview
Problem
The integration of coil antennas, such as NFC, WPC, and MST, in electronic devices poses a challenge due to the need for shielding layers that block magnetic fields, leading to increased thickness and reduced battery space.
Innovation Solution
An electronic device design that incorporates a metal shield to block magnetic fields in the -Z axis direction, while reducing the area of the shielding layer and enhancing the recognition area and charging efficiency of wireless charging by expanding the WPC area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding layer is applied to block magnetic fields from coil antennas, then magnetic field blocking is improved, but device thickness increases and battery space is reduced
Solution Approach 1:
The patent transitions from planar shielding layers to a three-dimensional metal shield structure with specific geometric features (protrusions and recesses) that provide magnetic field blocking in multiple directions simultaneously, reducing the need for thick sequential shielding layers
Solution Approach 2:
The patent combines ferromagnetic material properties with a structured metal shield design, utilizing the high magnetic permeability of ferromagnetic materials to concentrate and redirect magnetic fields while maintaining a compact form factor
2Object-affected harmful factors
If a shielding layer is applied to block magnetic fields from coil antennas, then magnetic field blocking is improved, but battery space is reduced
Solution Approach 1:
The metal shield structure utilizes vertical protrusions and recesses to create three-dimensional magnetic field management, providing effective shielding with reduced overall volume compared to traditional planar shielding approaches
Solution Approach 2:
The shield structure features localized protrusions and recesses positioned strategically around the coil antenna areas, providing magnetic field blocking only where needed rather than using extensive uniform shielding layers
3Productivity
If the WPC area is expanded to improve wireless charging recognition and charging efficiency, then charging efficiency is improved, but magnetic field interference may increase
Solution Approach 1:
The patent uses the metal shield structure to convert potentially harmful magnetic field interference from expanded WPC coils into beneficial concentrated magnetic flux, directing the fields toward the charging surface while blocking interference in other directions
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 proposed solution effectively reduces the thickness of the device, preserves battery space, and improves wireless charging efficiency by strategically positioning the metal shield and optimizing the shielding layer's area.
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
Figure 1
Figure 2A
Figure 2B
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 which electrically connect the first circuit board, coil antennas disposed inside the housing and including a plurality of antennas having conductive patterns formed to generate magnetic fields, a shielding layer disposed below a first antenna from among the plurality of antennas and metal shields which are disposed on side surfaces of the coil antennas and shield a magnetic field in a first direction from among magnetic fields formed by the coil antennas.