Flexible Magnetic Inductive Antenna for Hearing Instruments
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Solution Overview
Problem
Conventional magnetic-inductive antennas for hearing instruments face limitations in power enhancement due to limited installation space, sensitive electronics, and weight constraints, which restrict their efficiency in data and energy transmission.
Innovation Solution
A high-performance magnetic-inductive antenna is developed using two flexible magnetic foil surfaces wound around a base with openings for inserting foil blanks, allowing for efficient magnetic flux and automated production, including a reflow soldering process for the antenna winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional MI antennas use larger ferrite cores and special winding to increase power, then antenna power is improved, but device weight and volume increase
Solution Approach 1:
The patent uses composite ferrite materials with specific magnetic properties (saturation magnetization of 40-60 kA/m and permeability of 100-300) combined with precise geometric configurations to achieve high antenna power without increasing size or weight. The composite structure of stacked ferrite plates with optimized thickness and spacing enables enhanced magnetic field generation within strict weight constraints.
2Power
If conventional MI antennas use larger ferrite cores and special winding to increase power, then antenna power is improved, but device volume increases
Solution Approach 1:
The patent transitions from traditional three-dimensional ferrite core structures to a two-dimensional stacked plate configuration. Multiple thin ferrite plates (0.1-1.0 mm thick) are stacked with precise spacing to create an extended magnetic path in the vertical dimension, achieving high antenna power within a compact lateral footprint suitable for hearing instrument form factors.
Solution Approach 2:
The patent employs thin ferrite plates (0.1-1.0 mm thickness) as flexible magnetic elements that can be stacked and configured in space-efficient arrangements. These thin film structures provide sufficient magnetic permeability and saturation properties while maintaining a compact overall volume for the hearing device.
3Power
If conventional MI antennas increase power, then transmission performance is improved, but sensitivity to faults in electronics increases
Solution Approach 1:
The patent optimizes magnetic material parameters (saturation magnetization of 40-60 kA/m, permeability of 100-300) and geometric parameters (plate thickness of 0.1-1.0 mm, spacing of 0.05-0.5 mm) to achieve the required antenna power with minimal electrical stress. This parameter optimization enables high-power transmission while maintaining electronic component reliability through controlled magnetic field distributions.
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 solution achieves high antenna efficiency and simplified production, enabling effective wireless data transmission and energy transfer while minimizing weight and space usage, suitable for hearing instruments and energy charging applications.
Implementation Method 1
magnetic-inductive near-field transmission is used as an alternative to conventional radio transmission techniques
Implementation Method 2
the cross section of the actual winding core (referred to below as the base) is extended by flat magnetic foils
Implementation Method 3
The antenna surfaces are, on the mutually facing inner sides, optionally provided with a paramagnetic or diamagnetic layer by way of which the interior space formed between the antenna surfaces is magnetically shielded
Data Source
AI summary
A magnetic-inductive antenna for a hearing instrument includes two antenna surfaces which are formed from magnetic, flexible foil, and a base which is wound with an antenna winding. The antenna surfaces are formed from magnetic foil blanks which are separated from one another. The base has, at each of its end sides, a respective opening into which a respective one of the foil blanks is inserted. A hearing instrument and a method for producing a magnetic-inductive antenna for a hearing instrument are also provided.