Middle-Frame NFC Antenna Layout for Multi-Side Phone Use
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional NFC antennas in mobile devices are difficult to realize and limit NFC usability to only the back side of the phone, restricting NFC transactions and contactless charging to specific areas.
Innovation Solution
Incorporating an NFC antenna into the middle frame of a mobile device, particularly at its end, using a loop configuration with electrically conductive and insulating materials, allowing for extended NFC usability and contactless charging on multiple sides of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the NFC antenna is placed on the back side of the mobile device on the battery, then the antenna can be easily realized, but the NFC usability is limited to only the back side
Solution Approach 1:
The mobile device frame is segmented into multiple functional zones, with the NFC antenna integrated into the middle frame structure rather than being confined to a single location on the back cover. This segmentation allows different parts of the device to serve both structural and NFC communication functions.
Solution Approach 2:
The middle frame of the mobile device is designed to serve multiple functions: providing structural support, housing electronic components, and acting as an NFC antenna. This multi-functionality eliminates the need for a separate dedicated antenna location, enabling NFC transactions from multiple sides of the device.
2Adaptability or versatility
If the NFC antenna is integrated into the middle frame at an end thereof, then the NFC usability is extended to multiple sides, but the manufacturing complexity increases
Solution Approach 1:
The NFC antenna structure is merged with the middle frame of the mobile device, combining the antenna elements with the existing frame components. This integration reduces the number of separate parts and simplifies the overall manufacturing process despite the enhanced functionality.
Solution Approach 2:
The middle frame's existing electrically conductive parts are utilized to form the NFC antenna, eliminating the need for additional dedicated antenna materials or components. The frame structure itself serves the dual purpose of mechanical support and electromagnetic radiation.
3Reliability
If a printed coil of conductive material stacked on a ferrite sheet is used, then the antenna can be realized, but the realization process is difficult
Solution Approach 1:
The complex multi-layer printed coil structure stacked on ferrite sheets is extracted and replaced with a simplified single-loop antenna design. This extraction removes the manufacturing complexity of aligning and assembling multiple layers while maintaining the essential antenna functionality.
Solution Approach 2:
The antenna design parameters are changed from a multi-layer printed coil with specific inductance requirements to a single-loop configuration with different dimensional parameters. This parameter change simplifies the manufacturing process while achieving the necessary NFC communication performance.
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
Enables NFC transactions and contactless charging on the back, front, and side of the mobile device, enhancing usability and flexibility while simplifying the antenna's realization within the device.
Implementation Method 1
NFC antenna comprising a loop formed into said at least one electrically conductive part and including two feeding points
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Mobile device, comprising a display (10), a back cover (13) and a middle frame (11) coupled on one side to said display and on another side to said back cover, wherein said middle frame (11) incorporates a Near field communication-NFC-antenna (1100).