Hearing Device Antenna Arrangement with Perpendicular Currents
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Solution Overview
Problem
Integrating multiple antennas, such as those for short and long transmission ranges, into hearing devices is challenging due to mutual interference and space constraints, leading to complex design measures and increased costs.
Innovation Solution
The antennas are arranged in immediate proximity with the electric antenna's current direction perpendicular to the magnetic antenna's conductor loop, and an LC high pass filter is used to isolate them, allowing for close positioning without interference, utilizing a ferromagnetic core with low electric conductivity and a printed circuit board layout for a space-saving design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are integrated into a hearing device, then wireless transmission capability is improved, but mutual interference between antennas increases
Solution Approach 1:
The patent positions the electric antenna and magnetic antenna in immediate mutual proximity with their current directions arranged perpendicular to each other (spatial orientation in three dimensions). This dimensional arrangement allows both antennas to coexist in a confined space while minimizing electromagnetic coupling and mutual interference, resolving the contradiction between integrating multiple antennas and avoiding interference.
Solution Approach 2:
The patent introduces an LC high pass filter as an intermediary component between the electric antenna and magnetic antenna. This filter acts as a mediator that blocks interfering signals from one antenna from affecting the other, while allowing the desired transmission signals to pass through, thus resolving the mutual interference issue while maintaining both wireless transmission capabilities.
2Object-affected harmful factors
If antennas are spaced far apart to reduce interference, then mutual interference is reduced, but the space required in the hearing device increases
Solution Approach 1:
The patent utilizes three-dimensional spatial arrangement by positioning the electric antenna and magnetic antenna with perpendicular current directions in immediate proximity. This dimensional approach allows the antennas to be close together physically while maintaining electromagnetic isolation, thereby reducing the volume required in the hearing device without sacrificing interference reduction.
Solution Approach 2:
The LC high pass filter serves as a compact intermediary that enables close positioning of the antennas while maintaining signal isolation. The filter's small footprint allows it to be integrated between the antennas in the confined hearing device space, providing interference reduction without requiring the antennas to be spaced far apart.
3Object-affected harmful factors
If complex filtering measures are used to suppress antenna interference, then mutual interference is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent employs a simple LC high pass filter that utilizes fundamental electrical parameters (inductance and capacitance) to achieve frequency-based signal separation. By changing the approach from complex multi-stage filtering to a simple first-order high pass filter, the patent reduces device complexity and manufacturing cost while still effectively suppressing mutual interference between the antennas.
Solution Approach 2:
The LC high pass filter acts as a simple intermediary component that provides effective interference suppression without the complexity of multi-stage filtering systems. The filter's straightforward design and single-stage operation reduce both the device complexity and manufacturing costs compared to complex filtering measures, while maintaining the ability to isolate the electric and magnetic 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
This arrangement enables effective isolation of antennas, reducing interference and space requirements, resulting in smaller, less expensive hearing devices with improved signal quality and antenna gain without the need for complex filtering measures.
Implementation Method 1
The two antennas (20, 30) are spatially arranged relative to each other such that the direction of the current in the electric conductor of the electric antenna extends substantially at right angles to the direction of the current in the conductor loop of the magnetic antenna. This prevents an electromagnetic alternating field generated by the electric antenna from generating any induced currents in the windings of the magnetic antenna.
Implementation Method 2
The magnetic antenna is in the form of a cylindrical coil with a ferromagnetic core, the ferromagnetic core being made from a material having a low electric conductivity and also having a low frequency-dependent relative permeability for the frequency of the electric antenna
Implementation Method 3
The low electric conductivity of the coil core prevents eddy currents from being induced therein
Implementation Method 4
In a further advantageous embodiment of the invention, the filter is in the form of an LC high pass
Data Source
AI summary
A device having an electric antenna and a magnetic antenna is described, the antennas being spatially arranged in immediate mutual proximity. The electric antenna has at least one current-carrying electric conductor which acts as a resonator for the electric antenna, while the magnetic antenna has a coil with at least one current-carrying conductor loop which acts as an inductor of the magnetic antenna. Thus the electric antenna and the magnetic antenna are spatially arranged relative to each other such that the direction of the current in the electric conductor of the electric antenna extends substantially at right angles to the direction of the current in the conductor loop of the magnetic antenna.