NFC Antenna Rod Outside Touchpad Perimeter
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Solution Overview
Problem
Existing input devices with NFC functionality face challenges in integrating cost-effective NFC antennas that do not interfere with capacitive touch sensing and do not require dedicated coil or ferrite components, while maintaining effective NFC performance.
Innovation Solution
The integration of an electrically conductive strip or rod as an antenna, which is part of the mounting bracket or positioned outside the touchpad perimeter, coupled with a matching network to compensate for impedance mismatch, enables NFC communication without affecting touch sensing capabilities and reduces costs by eliminating the need for traditional antenna components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional NFC antenna with coil or ferrite components is used, then NFC communication functionality is achieved, but device complexity and cost increase
Solution Approach 1:
The mounting bracket is merged with the antenna function by making it electrically conductive and configuring it to serve as the NFC antenna. This combines the mechanical support function with the electromagnetic radiation function into a single component, eliminating the need for separate coil or ferrite components.
Solution Approach 2:
The mounting bracket is designed to perform multiple functions: mechanical anchoring of the touchpad and NFC antenna operation. This multi-functionality reduces the overall component count and simplifies the device structure while maintaining both touch sensing and NFC communication capabilities.
2Reliability
If an NFC antenna is integrated into the touchpad assembly, then NFC communication is enabled, but interference with capacitive touch sensing occurs
Solution Approach 1:
The antenna is positioned in a segmented location outside the touchpad perimeter rather than being integrated within the touchpad area. This spatial segmentation separates the NFC antenna's electromagnetic field generation zone from the capacitive touch sensing zone, reducing mutual interference while maintaining both functions.
Solution Approach 2:
The mounting bracket serves as an intermediary structure that anchors the touchpad while also functioning as the antenna. By using the bracket as the antenna element rather than placing an antenna directly on or near the touchpad surface, the design mediates between NFC functionality and touch sensing performance.
3Reliability
If dedicated NFC antenna components are used, then NFC performance is maintained, but manufacturing cost increases
Solution Approach 1:
The mounting bracket is merged with the antenna function by making it electrically conductive and configuring it to serve as the NFC antenna. This combines the mechanical support function with the electromagnetic radiation function into a single component, eliminating the need for separate coil or ferrite components.
Solution Approach 2:
The mounting bracket serves itself by performing both its mechanical anchoring function and its electromagnetic radiation function. The same component that provides structural support also enables NFC communication, eliminating the need for additional dedicated antenna components and reducing manufacturing costs.
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 solution enhances NFC performance by maintaining a strong electromagnetic field over a larger region while minimizing interference with capacitive touch sensing, thus improving usability and reducing overall costs of touchpad assemblies with NFC functionality.
Implementation Method 1
an antenna electrically interfaced with the NFC controller, wherein the antenna comprises an electrically conductive strip formed by a segment of the mounting bracket
Data Source
AI summary
An input device a touchpad, an near field communication (NFC) controller, and an antenna electrically interfaced with the NFC controller. The antenna includes an antenna rod. The antenna rod is straight and disposed outside a perimeter of the touchpad.