Transparent NFC Antenna Layout for Higher Radiation Efficiency
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Solution Overview
Problem
Conventional transparent conducting films used in wireless antennas for wearable devices, such as smartwatches, suffer from higher Ohmic loss and reduced radiation efficiency compared to traditional metals, necessitating a design that maintains transparency while enhancing conductivity.
Innovation Solution
A near-field communication (NFC) antenna design incorporating both transparent and non-transparent conducting portions, where the transparent portion uses metal mesh or indium tin oxide for optical transparency and conductivity, and the non-transparent portion, with a metalized film edge, is positioned along the perimeter to maximize usability and viewability, eliminating the need for a ferrite substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conducting films are used in wireless antennas, then optical transparency is improved, but radiation efficiency deteriorates due to higher Ohmic loss
Solution Approach 1:
The patent uses a composite structure combining transparent conducting film with ferrite substrate. The transparent conducting film (e.g., ITO or metal mesh) provides optical transparency while the ferrite substrate compensates for Ohmic losses through its magnetic properties, thereby maintaining both transparency and radiation efficiency
Solution Approach 2:
The patent optimizes parameters such as the thickness of the transparent conducting film, the mesh size and pattern, and the ferrite substrate properties to balance optical transparency and electrical conductivity. By adjusting these parameters, the design achieves acceptable radiation efficiency while maintaining transparency
2Illumination intensity
If transparent conducting portions are used throughout the antenna, then optical transparency is improved, but manufacturing complexity increases due to the need for ferrite substrate integration
Solution Approach 1:
The patent applies different materials to different regions of the antenna structure. The transparent conducting film is used in regions requiring transparency, while the ferrite substrate is integrated in specific areas to provide magnetic support and loss compensation. This localized approach balances transparency requirements with manufacturing feasibility
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 design achieves improved radiation efficiency and reduced physical footprint by integrating transparent NFC antennas into display touch panels without compromising usability or viewability, effectively addressing the limitations of conventional transparent conductors.
Implementation Method 1
transparent conducting film such as transparent metal mesh, indium tin oxide (ITO), or a combination of the same can offer up to 98% optical transmission with relatively high conductivity
Implementation Method 2
A coil structure made of transparent conductors will suffer greater Ohmic loss and have less radiation efficiency than a coil structure made of conventional metals
Data Source
AI summary
The disclosed apparatus may include a transparent NFC antenna that includes a transparent portion and a non-transparent portion. The transparent NFC antenna improves the radiation efficiency of standard NFC antennas by including a transparent conducting film such as metal mesh in the transparent portion, and metalized film in the non-transparent portion. The metalized film can extend along a narrow width of the perimeter of the transparent portion. In one implementation, the transparent NFC antenna can be incorporated into a touch-enabled display panel of a wrist-wearable device without interfering with the usability or viewability of the touch-enabled display panel. Various other implementations are also disclosed.