Electromagnetic Induction Wireless Communication System for Hearing Aids
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Solution Overview
Problem
Current wireless communication systems, such as RF-based hearing aids, face challenges with security and interference due to their large range and high frequency, which are exacerbated by the human body, and magnetic field induction systems have limited range and difficulty in communicating with all parts of the body.
Innovation Solution
An electromagnetic induction wireless communication system that combines a magnetic antenna with an electric antenna, a tuning capacitor, and a controller to produce communication signals with amplitude and phase differences, improving communication range and reliability near the human body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If RF based hearing aids operate in the 2.5 GHz ISM band with transverse waves, then communication range is extended to approximately 30 meters, but security of communication content deteriorates and interference increases
Solution Approach 1:
The patent changes the operating frequency from 2.5 GHz to 10.6 MHz and transitions from transverse electromagnetic waves to magnetic field induction, fundamentally altering the propagation characteristics to achieve shorter range while improving security and reducing interference
Solution Approach 2:
The patent replaces the electromagnetic wave propagation mechanism with magnetic field induction, substituting the transverse wave mechanism with a near-field magnetic coupling mechanism that inherently limits range and improves security
2Volume of moving object
If magnetic field induction based wireless systems use small antennas, then device size is reduced for hearing aid applications, but communication range is limited and cannot reach all parts of the human body
Solution Approach 1:
The patent uses a tunable capacitor to dynamically adjust the resonant frequency of the magnetic antenna, allowing the system to optimize performance at 10.6 MHz and extend communication range while maintaining small antenna size suitable for hearing aids
Solution Approach 2:
The patent creates a multi-functional antenna system that can operate in both magnetic field induction mode and electromagnetic wave mode, allowing it to serve multiple communication needs while maintaining compact dimensions
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 system extends communication range and reduces path loss by 17.57 to 23.57 dB compared to magnetic induction methods, ensuring consistent communication across the human body by varying the amplitude and phase of electromagnetic fields.
Implementation Method 1
An electromagnetic induction wireless communication system includes: a magnetic antenna; an electric antenna
Data Source
AI summary
A electromagnetic induction wireless communication system including: a magnetic antenna; an electric antenna; a tuning capacitor coupled to the magnetic antenna configured to tune the magnetic antenna; a controller configured to control the operation of the communication system; a signal source coupled to the controller configured to produce a communication signal used to drive the magnetic antenna and the electric antenna; a voltage control unit coupled to the signal source configured to produce one of an amplitude difference, phase difference, and an amplitude and a phase difference between the communication signal used to drive the magnetic antenna and electric antenna.