Switchable NFC Antenna for Human-Body Electric Field Reception
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Solution Overview
Problem
Conventional NFC terminals have inefficient signal reception in IBC mode due to their loop antennas being optimized for magnetic fields, which are less effective in receiving electric fields transmitted through the human body.
Innovation Solution
Adapting the NFC antenna to disconnect one end, transforming it into a wire antenna to enhance reception of electric fields, allowing better IBC signal quality, while maintaining compatibility with NFC mode by reconnecting the end as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional NFC loop antenna is used, then magnetic field reception is optimized, but electric field reception quality deteriorates
Solution Approach 1:
The patent implements a dynamic antenna configuration system where a switching member can change the antenna's electrical connectivity state based on the communication mode. The controller dynamically switches between connecting and disconnecting the antenna ends, transforming the antenna from a loop configuration (optimized for magnetic fields in NFC mode) to an open-wire configuration (optimized for electric fields in IBC mode), thereby resolving the contradiction between magnetic field reception optimization and electric field reception quality
Solution Approach 2:
The patent changes the electrical parameters of the antenna by modifying its connectivity state. By controlling the switching member to disconnect one end of the antenna, the antenna's impedance and current distribution characteristics are fundamentally altered, transforming it from a resonant loop structure to a non-resonant wire structure. This parameter change enables the antenna to effectively receive electric fields in IBC mode while maintaining the capability to receive magnetic fields in NFC mode
2Measurement precision
If the antenna is transformed to wire antenna for IBC mode, then electric field reception improves, but magnetic field reception capability deteriorates
Solution Approach 1:
The system employs a dynamic switching mechanism controlled by a controller that monitors the communication mode. When IBC mode is detected or selected, the controller activates the switching member to disconnect the antenna end, optimizing electric field reception. When NFC mode is detected or selected, the controller deactivates the switching member to maintain the loop antenna configuration, ensuring magnetic field reception capability. This dynamic adaptation resolves the contradiction between electric field reception improvement and NFC mode compatibility
Solution Approach 2:
The patent designs a universal antenna system that can perform both NFC and IBC functions by incorporating a switching member. The same physical antenna structure serves dual purposes: as a loop antenna for NFC magnetic field reception and as an open-wire antenna for IBC electric field reception. The switching member enables the antenna to adapt its configuration based on the required function, making the system universally compatible with both communication modes without requiring separate dedicated antennas
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
Improves IBC signal reception quality by optimizing the NFC antenna for electric fields, ensuring efficient communication through the human body without compromising NFC functionality.
Implementation Method 1
at least one near-field communication antenna intended to receive a near-field electromagnetic signal
Data Source
AI summary
A method and device for processing a near-field communication. The device includes: at least one near-field communication antenna intended to receive a near-field electromagnetic signal and having at least one end; a switching member connected to the end of the antenna; and a controller able to receive the antenna signals and control the switching member. The switching member is able to disconnect the end of the antenna when it receives a first switching command, called an IBC command.