Stacked Coil Antenna Layout for NFC, MST, and Wireless Charging
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Solution Overview
Problem
Electronic devices face challenges in securing optimal radiation performance for NFC, MST, and wireless charging due to space constraints, as antennas need to be accommodated in a limited internal space while maintaining effective functionality.
Innovation Solution
The electronic device employs a multilayer structure for antennas, allowing them to share radiating components and emit magnetic signals in various directions, thereby reducing overall size and enhancing radiation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are disposed in a limited internal space, then the device can support NFC, MST, and wireless charging functions, but the radiation performance of the antennas deteriorates due to space constraints and interference
Solution Approach 1:
The patent transitions from planar antenna layouts to a three-dimensional stacked configuration where antennas are arranged vertically across multiple layers. This dimensional change allows multiple antennas to coexist in limited space while maintaining their radiation characteristics by separating them in the vertical dimension rather than competing for horizontal space.
Solution Approach 2:
The patent implements a nested arrangement where antennas are stacked one above another in a vertical configuration, with each antenna layer positioned within the projection area of the device. This nesting approach maximizes space utilization while maintaining radiation performance by ensuring proper spacing and orientation between nested antenna elements.
2Volume of moving object
If the overall size of antennas is reduced to fit in limited space, then the device internal space becomes less restricted, but the radiation performance deteriorates
Solution Approach 1:
The patent compensates for reduced antenna footprint by extending the antenna structure vertically into the third dimension. Multiple antenna layers are stacked with appropriate spacing, allowing each antenna to maintain adequate radiating area while the overall horizontal footprint remains compact, thus preserving radiation performance despite size constraints.
Solution Approach 2:
The patent combines multiple antenna functions into a single stacked assembly where adjacent antenna layers share common support structures and mounting interfaces. This merging approach reduces the overall volume required for multiple antennas while maintaining their individual radiation characteristics through proper vertical spacing and isolation.
3Volume of moving object
If antennas are arranged in a multilayer stacked structure, then the overall antenna size is reduced and internal space is freed, but the device complexity increases
Solution Approach 1:
The patent designs the stacked antenna structure to serve multiple wireless communication functions simultaneously. The same vertical stack supports NFC, MST, and wireless charging operations by configuring different layers with appropriate resonant frequencies and coupling characteristics, thereby reducing overall size without proportionally increasing complexity through functional integration.
Solution Approach 2:
The patent divides the antenna system into discrete stacked layers, each optimized for specific functions. This segmentation allows independent design and tuning of each layer while maintaining a compact overall structure, reducing complexity by breaking down the multi-functional requirement into manageable modular units that can be systematically arranged.
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 stable radiation performance and efficient use of internal space, allowing for effective NFC, MST, and wireless charging operations.
Implementation Method 1
a first conductive coil positioned inside the housing... a second conductive coil and third conductive coil positioned inside the housing... positioned above the display when viewed from above the second surface
Data Source
Figure 1
Figure 2~3a
Figure 3b
AI summary
An electronic device is provided. The electronic device includes a housing including a first surface facing in a first direction, a second surface facing in a second direction opposite to the first direction, and a side surface enclosing a space between the first surface and the second surface, a display exposed at least partially through the first surface, a first conductive coil positioned inside the housing, positioned above the display when viewed from above the second surface, and having an axis substantially perpendicular to the first direction or the second direction, and a second conductive coil and a third conductive coil positioned inside the housing, positioned above the first conductive coil when viewed from above the second surface, and having an axis substantially horizontal to the first direction or the second direction.