Flexible NFC Relay Layout for Meter-Scale Textile Sensing
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Solution Overview
Problem
Current near-field communication (NFC) systems for wireless sensor networks require close proximity between sensors and readers, limiting their practical implementation, and existing technologies either need battery power or have a very limited range, while electronic textiles with integrated sensors are vulnerable to wear and washing.
Innovation Solution
A near-field communication system using flexible substrates with inductor patterns and conductive tubing embroidered on textiles, enabling electromagnetic induction for wireless power and data connectivity across distant body points, allowing battery-free operation and robustness against wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional NFC is used for wireless sensor networks, then close proximity communication is achieved, but the operation range is severely limited to a few centimeters
Solution Approach 1:
The patent introduces an NFC relay as an intermediary device that extends the communication range. The relay consists of a first NFC interface that receives signals from the reader and a second NFC interface that transmits signals to the sensor, acting as a mediator to bridge the gap between the reader and distant sensors. This allows the system to maintain reliable near-field communication while extending the operational distance beyond the typical few centimeters limitation of direct NFC communication.
2Ease of operation
If battery-powered wireless sensors are used, then independent operation is achieved, but vulnerability to eavesdropping and battery requirements arise
Solution Approach 1:
The patent extracts the battery and independent operation capability from the sensor nodes, making them passive and battery-free. Instead of each sensor having its own power source, the system uses a centralized reader that wirelessly powers multiple sensors through the NFC relay network. This eliminates the security vulnerabilities associated with battery-powered independent sensors while maintaining their operational functionality.
3Adaptability or versatility
If electronic textiles with integrated sensors are used, then wireless monitoring is achieved, but vulnerability to washing and daily wear occurs
Solution Approach 1:
The patent segments the sensing system into separate components: the sensors remain integrated into the electronic textiles for adaptability, while the NFC relay and reader are external devices that provide durable communication infrastructure. This segmentation allows the textile sensors to be replaced or washed independently, while the durable NFC relay handles the wireless communication tasks, protecting the electronic components from wear and washing damage.
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 wireless power and data connectivity up to a meter scale, maintaining efficient operation despite deformation and wetting, supporting continuous physiological monitoring and multi-node sensing.
Implementation Method 1
an electric circuit on the flexible substrate, wherein the electric circuit comprises a hub inductor pattern configured to receive and transmit via electro-magnetic induction; one or more terminal inductor patterns laterally spaced apart from the hub inductor pattern relative to a surface of the flexible substrate and configured to receive and transmit via electro-magnetic induction
Data Source
AI summary
Methods and systems for a near-field communication. In one aspect, a method of fabricating a relay for a near-field communication system comprises the steps of providing a flexible substrate; and providing an electric circuit on the flexible substrate, wherein the electric circuit comprises a hub inductor pattern configured to receive and transmit via electro-magnetic induction; one or more terminal inductor patterns laterally spaced apart from the hub inductor pattern relative to a surface of the flexible substrate and configured to receive and transmit via electro-magnetic induction; and a connecting trace between the hub inductor and the one or more terminal inductors.