NFC Antenna Assembly With Floating Conductor for Display Shielding
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Solution Overview
Problem
NFC devices embedded in systems face communication challenges due to shielding effects from the display, which absorb and reflect a significant portion of the emitted radio frequency signal, preventing effective communication with external NFC devices.
Innovation Solution
An NFC antenna assembly is designed with a plane conductive surface insulated from the antenna and positioned to overlay a portion of the winding inner region, acting as an electromagnetic field reflector to enhance signal strength and improve communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an NFC antenna is embedded into a system with a display, then the NFC device can be integrated into the system structure, but the display shielding effect absorbs and reflects radio frequency signals, reducing communication efficiency
Solution Approach 1:
The patent converts the harmful shielding effect of the display into a beneficial reflection effect by introducing a conductive surface that reflects radio frequency signals back toward the antenna. This reflected signal compensates for the energy lost through the display, transforming the display's shielding property from harmful to useful for enhancing NFC communication efficiency
Solution Approach 2:
The patent introduces a conductive surface as an intermediary element between the antenna and the display. This conductive surface acts as a mediator that reflects radio frequency signals, creating a signal path that bypasses the display's shielding effect and improves overall communication reliability without compromising system integration
2Reliability
If a conductive surface is added to reflect electromagnetic signals, then signal strength and quality factor increase, but the device structure and manufacturing complexity increase
Solution Approach 1:
The conductive surface is designed to serve multiple functions: it reflects radio frequency signals to enhance NFC communication, provides structural support within the device assembly, and can be integrated with existing display components. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity while achieving improved signal strength
Solution Approach 2:
The patent optimizes key parameters of the conductive surface including its position relative to the antenna, its dimensions, and its electrical properties to achieve maximum signal reflection efficiency. By carefully controlling these parameters, the patent achieves significant improvements in signal strength and quality factor with minimal additional structural complexity
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 conductive surface lowers antenna resistance, increases the quality factor, and enhances the radio frequency signal strength, enabling effective NFC communication through the display.
Implementation Method 1
acting as an electromagnetic field reflector to enhance signal strength
Implementation Method 2
insulated from the antenna and being at a floating potential
Data Source
AI summary
The present disclosure relates to an NFC antenna assembly including: an NFC signal antenna having terminals and at least one plane winding arranged in a first plane; and a plane conductive surface: insulated from the antenna and being at a floating potential; overlaying a first region arranged outside the winding and including the terminals of the antenna; and overlaying from 7% included to 40% included of a winding inner region.