Layered Wireless Charging Antenna Layout for Compact NFC Integration
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Solution Overview
Problem
The challenge is to design a compact NFC antenna within an electronic device that also supports wireless charging, while ensuring uniform magnetic field generation and compatibility with external compact NFC devices, amidst space constraints and magnetic field density variations during alignment and misalignment.
Innovation Solution
The electronic device incorporates a wireless charging antenna with a spiral shape, featuring a first and second conductive pattern formed in multiple layers, where the patterns intersect to form a lateral structure, allowing the NFC antenna to be disposed internally and maintaining a smaller size than the wireless charging antenna, with via-holes connecting layers to optimize magnetic field distribution and reduce parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the NFC antenna is made compact to fit within the electronic device, then the device size is reduced, but the NFC antenna may interfere with the wireless charging antenna's magnetic field generation
Solution Approach 1:
The NFC antenna is disposed inside the wireless charging antenna structure, with the NFC antenna's outer perimeter fully contained within the wireless charging antenna's inner perimeter. This nesting arrangement allows both antennas to coexist in a compact configuration while maintaining their respective functions, as the NFC antenna operates in the central region where it does not significantly disrupt the magnetic field generation of the wireless charging antenna.
Solution Approach 2:
The wireless charging antenna uses a lateral structure with intersection points where conductive patterns from different layers intersect and are electrically connected. This creates regions of different magnetic field density - the lateral structure generates more uniform magnetic fields in certain areas, which helps compensate for the presence of the NFC antenna and maintains overall wireless charging performance despite the space constraints.
2Stability of the object's composition
If coils are disposed to uniformly generate magnetic field, then magnetic field density difference between alignment and misalignment states is reduced, but the antenna structure becomes more complex
Solution Approach 1:
The wireless charging antenna transitions from a planar two-dimensional structure to a three-dimensional lateral structure by adding vertical layering. Conductive patterns are arranged in multiple layers with intersections connecting different levels, creating a立体 (three-dimensional) configuration that generates more uniform magnetic fields compared to traditional planar designs, while the intersection points provide electrical connectivity between layers.
Solution Approach 2:
The wireless charging antenna employs a composite structure combining multiple conductive patterns from different layers, where each layer contributes to the overall magnetic field generation. The intersection points serve as connection nodes that integrate these different conductive elements, creating a composite antenna system that achieves superior magnetic field uniformity through the synergistic arrangement of its components.
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 enables efficient wireless charging and near-field communication compatibility with compact external NFC devices, ensuring stable performance and uniform magnetic field density across alignment states.
Implementation Method 1
an antenna configured to perform a wireless charging function
Implementation Method 2
an antenna configured to perform a near field communication (NFC) function
Data Source
AI summary
The electronic device comprises: a housing; a wireless charging circuit disposed inside the housing; and a wireless charging antenna electrically connected to the wireless charging circuit and having a spiral shape, wherein the wireless charging antenna comprises: a first conductive pattern corresponding to a region in which current flows toward the inside of the wireless charging antenna from among the regions forming the wireless charging antenna; and a second conductive pattern corresponding to a region in which current flows toward the outside of the wireless charging antenna from among the regions forming the wireless charging antenna, and being disposed on a side of the first conductive pattern on the same plane as and in parallel with the first conductive pattern. The first conductive pattern and the second conductive pattern are formed of a plurality of layers including a first layer and a second layer. In a first region where a partial region of the first conductive pattern and a partial region of the second conductive pattern cross each other, the first conductive pattern may not include the first layer, and the second conductive pattern may not include the second layer.