NFC Antenna Assembly With Radial Slots for Metal Shells
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Solution Overview
Problem
Traditional NFC antennas on metal shells suffer from high eddy-current loss, large volume, and short communication distance due to inefficient magnetic flux coupling.
Innovation Solution
The NFC antenna assembly incorporates a metal plate with a fitting aperture, a mounting sheet with radial slots, and an insulating washer, which reduces eddy currents and enhances magnetic flux by allowing magnetic lines to pass through, increasing communication distance while minimizing volume and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional NFC antenna is mounted on metal shell, then the antenna structure is simple, but eddy-current loss increases and communication distance decreases
Solution Approach 1:
The invention segments the antenna system into multiple functional layers: mounting sheet with first through slots, insulating washer, metal plate with second through slots, and ferrite sheet. This segmentation allows each layer to perform its specific function - the slots in mounting sheet and metal plate interrupt eddy current paths, the insulating washer provides electrical isolation, and the ferrite sheet enhances magnetic flux, collectively reducing eddy-current loss while maintaining structural simplicity
Solution Approach 2:
The insulating washer acts as an intermediary layer between the mounting sheet and metal plate, providing electrical isolation that prevents eddy current formation. The through slots in both mounting sheet and metal plate serve as intermediaries that interrupt eddy current paths while allowing magnetic flux to pass through, effectively reducing eddy-current loss without complicating the overall antenna structure
2Device complexity
If traditional NFC antenna is mounted on metal shell, then the antenna structure is simple, but communication distance becomes short
Solution Approach 1:
The invention changes the magnetic properties of the antenna system by introducing ferrite sheet material and optimizing the slot dimensions and patterns in the mounting sheet and metal plate. These parameter changes enhance magnetic flux coupling and reduce eddy-current losses, directly improving communication distance while keeping the overall antenna structure relatively simple
Solution Approach 2:
By segmenting the antenna structure into multiple functional layers with specific slot patterns and material properties, the invention optimizes magnetic flux distribution and reduces energy loss, thereby extending communication distance without significantly increasing structural complexity
3Device complexity
If traditional NFC antenna is mounted on metal shell, then the antenna structure is simple, but volume becomes large
Solution Approach 1:
The invention employs a nested structure where the mounting sheet with slots is positioned on the metal plate, the insulating washer is placed between them, and the ferrite sheet is integrated into the assembly. This nested arrangement allows multiple functional components to be compactly organized in layers, reducing overall antenna volume while maintaining the simplicity of the structural design approach
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
The solution effectively increases communication distance, reduces volume, and ensures safe operation by improving magnetic flux coupling and reducing eddy currents, while maintaining cost-effectiveness.
Implementation Method 1
a large eddy-current loss
Implementation Method 2
magnetic lines of force are coupled to the metal plate which is equal to an amplifier, and thus a magnetic flux is improved
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
A NFC antenna assembly is provided. The NFC antenna assembly includes: a metal plate defining a fitting aperture which penetrates through the metal plate in a thickness direction of the metal plate; a mounting sheet disposed in the fitting aperture; an insulating washer disposed in the fitting aperture and surrounding the mounting sheet; and an NFC antenna disposed on the mounting sheet, in which the mounting sheet comprises a first through slot extended in a radial direction of the mounting sheet, and the metal plate comprises a second through slot extended from the fitting aperture to a periphery of the metal plate.