Flexible PCB Antenna Module Integrating NFC and MST Coils
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Solution Overview
Problem
The design of smartphone antenna modules for NFC and MST is hindered by limited space due to existing wireless communication components and components like batteries, which affect antenna operation, requiring innovative layouts and structures to accommodate these low-frequency antennas effectively.
Innovation Solution
A flexible PCB antenna module with integrated magnetic sheets and coils, where coils are arranged in series or parallel, and magnetic sheets are strategically positioned to optimize antenna performance without electrical connections between coils, allowing for efficient NFC and MST operations within the constrained smartphone environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless communication components and batteries are installed in smartphones, then smartphone functionality is improved, but available space for NFC and MST antennas is reduced
Solution Approach 1:
The patent combines NFC and MST antenna functions into a single integrated structure using a flexible PCB with multiple coils. The first coil serves as the NFC antenna while the second and third coils work together as the MST antenna, allowing both wireless communication functions to coexist in a limited space without requiring separate antenna components.
Solution Approach 2:
The patent implements a nested arrangement where the first coil (NFC antenna) is positioned within the same flexible PCB structure that contains the second and third coils (MST antenna). The magnetic sheet is positioned to overlap with both coil structures, creating a nested configuration that maximizes space utilization while maintaining distinct functional zones for different wireless communication technologies.
2Adaptability or versatility
If antenna structures are redesigned to accommodate limited space, then antenna integration is improved, but design complexity increases
Solution Approach 1:
The flexible PCB serves as a universal platform that hosts multiple antenna functions. By designing the PCB with multiple coil structures that can function as different antenna types (NFC and MST), the patent reduces the need for separate antenna components and simplifies the overall integration process while maintaining multi-functionality.
Solution Approach 2:
The patent applies different magnetic sheet positioning strategies for different coil sections. The magnetic sheet is positioned to overlap with the first coil for NFC optimization, while also overlapping with the second and third coils for MST optimization. This localized optimization approach allows each antenna function to have its own tailored magnetic environment without requiring complete redesign of the entire antenna structure.
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 enhances antenna performance by minimizing interference from metal housing and internal components, enabling effective wireless communication and charging functions while maintaining a compact form factor.
Implementation Method 1
a magnetic sheet comprising a first sheet portion, a second sheet portion and a third sheet portion... the first sheet portion is located on the side of the first major surface and overlaps the first coil segment of the first coil... the second sheet portion interposed between the first and third sheet portions is located on the side of the second major surface and overlaps both the second coil segment of the first coil and the second coil segment of the second coil
Data Source
AI summary
A thin, flexible antenna module is provided for use in a smartphone. When the antenna module is assembled in the smartphone, the antenna module provides an MST antenna and an NFC antenna. For this, the antenna module includes a flexible PCB containing coils and further includes a magnetic sheet engaged with flexible PCB. The flexible PCB and the magnetic sheet are attached to each other to form a single body.