Flexible PCB Antenna Module for Smartphone Space Constraints
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Solution Overview
Problem
The limited space in smartphones for NFC and MST antennas due to existing wireless communication components and metal housing interference necessitates innovative antenna design and layout solutions.
Innovation Solution
A flexible smartphone antenna module integrating a magnetic sheet and a flexible PCB with two coil antennas, where the magnetic sheet is arranged to overlap the coil antennas, forming a single, thin, flexible body that minimizes electrical connections and maximizes space efficiency, with specific dimensions and configurations to accommodate both MST and NFC frequencies without interfering with the metal housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple wireless communication components (LTE, Wi-Fi, Bluetooth antennas) are already housed in smartphones, then wireless communication capabilities are comprehensive, but available space for additional NFC or MST antennas is limited
Solution Approach 1:
The patent implements nesting by placing the first coil antenna (MST) and second coil antenna (NFC) in concentric configurations where one antenna is positioned within the area of another. The flexible PCB is folded to create overlapping layers, allowing both antennas to occupy the same spatial footprint rather than requiring separate areas. This nesting approach enables dual antenna functionality within the constrained space of existing smartphone designs.
Solution Approach 2:
The patent utilizes the third dimension (thickness/folding) to resolve space constraints. The flexible PCB is folded to create a three-dimensional structure where antennas are positioned at different vertical levels and angular orientations. This dimensional transformation allows antennas to coexist in limited planar space by exploiting the Z-axis and angular separation, effectively increasing available antenna space without increasing the smartphone's footprint.
2Strength
If metal housing is used in smartphones, then structural strength and aesthetics are improved, but interference with antenna operation occurs
Solution Approach 1:
The patent applies local quality by creating magnetically isolated zones around the antenna elements. Magnetic sheets are positioned adjacent to the coil antennas to contain and direct magnetic flux locally, preventing interference with the metal housing. The flexible PCB is folded to create physical separation between antennas and metal surfaces at critical locations. This localized magnetic shielding and spatial separation maintains the overall metal housing structure while protecting specific antenna regions from interference.
3Area of stationary object
If flexible PCB with folded structure is used to integrate multiple antennas, then space efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs a flexible PCB as a thin film substrate that can be folded into complex three-dimensional configurations. This flexible film approach allows multiple antennas to be integrated on a single substrate that can be bent and folded to achieve the required spatial arrangement. The flexible nature of the PCB enables post-manufacturing folding and assembly, reducing the need for complex multi-layer rigid PCB designs and simplifying the integration of multiple antenna elements into a compact form factor.
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 allows for efficient operation of both MST and NFC antennas within the constrained smartphone space, reducing interference from metal components and enhancing wireless communication capabilities.
Implementation Method 1
a magnetic sheet comprising a first magnetic sheet portion, a second magnetic sheet portion and a third magnetic sheet portion interposed between the first and second magnetic sheet portions
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 two coil antennas 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.