BTE Hearing Aid Loop Antenna for Orientation-Insensitive Wireless Links
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Solution Overview
Problem
Existing Behind-The-Ear (BTE) hearing instruments face challenges in achieving efficient wireless communication both for binaural links and with remote devices, particularly at frequencies from 1 to 6 GHz, due to the limited size of the BTE housing which restricts antenna size and efficiency, and are sensitive to orientation placement.
Innovation Solution
A U-shaped loop antenna with a tuning capacitor and differential feed structure, where the capacitor plates are located on the sides of the housing adjacent to the U-shaped contour, and the free ends of the legs are closer to the battery, allowing for high radiation efficiency and insensitivity to orientation, enabling efficient communication across a range of frequencies without degrading performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional antenna design is used in a BTE hearing aid, then the antenna size can be kept small to fit the housing, but the radiation efficiency deteriorates at frequencies from 1 to 6 GHz
Solution Approach 1:
The patent transitions from planar antenna designs to a three-dimensional configuration by positioning capacitor plates on opposite sides of the housing (first side and second side), creating a spatially extended electromagnetic structure that achieves resonant frequencies from 1 to 6 GHz within the constrained BTE housing volume
Solution Approach 2:
The antenna structure is nested within the BTE housing by integrating the U-shaped loop and capacitor plates into the existing housing structure, with the loop contour positioned on the first side and capacitor plates on both the first and second sides, maximizing space utilization while maintaining radiation efficiency
2Volume of moving object
If the BTE housing size is reduced to improve comfort, then wearability improves, but antenna efficiency deteriorates
Solution Approach 1:
The patent overcomes the housing size limitation by utilizing three-dimensional space within the BTE housing, positioning the U-shaped loop on one side and capacitor plates on both the first and second sides of the housing, creating an extended electromagnetic structure that achieves resonant frequencies from 1 to 6 GHz despite the compact housing volume
Solution Approach 2:
The antenna structure combines different conductive materials and configurations (U-shaped loop, capacitor plates, and connecting elements) to create a composite electromagnetic structure that maintains high radiation efficiency while fitting within the reduced BTE housing size
3Device complexity
If a simple antenna structure is used to reduce complexity, then manufacturing ease improves, but radiation efficiency and orientation insensitivity deteriorate
Solution Approach 1:
The antenna is segmented into distinct functional components: a U-shaped loop with two legs and a base portion on the first side of the housing, and capacitor plates positioned on both the first and second sides. This segmentation allows each component to be optimized for its specific function while maintaining overall structural simplicity and manufacturing feasibility
Solution Approach 2:
The patent employs asymmetric positioning of the capacitor plates relative to the U-shaped loop, with plates located on opposite sides of the housing, creating an asymmetric electromagnetic structure that provides orientation insensitivity while maintaining radiation efficiency across different佩戴 orientations
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 proposed antenna design achieves high radiation efficiency along the head surface and maintains performance for wireless communication with devices at a distance, providing a 5 dB gain in the rearward direction and a 10 dB advantage for binaural links by optimizing the placement and structure of the antenna components.
Implementation Method 1
a loop antenna with a U-shaped contour comprising two legs connected by a base portion... enabling efficient communication across a range of frequencies
Implementation Method 2
The antenna enables high radiation efficiency along the head surface... at frequencies from 1 to 6 GHz
Implementation Method 3
a tuning capacitor comprising a first capacitor plate at the free end of one of the legs and a second capacitor plate at the free end of the other leg
Data Source
AI summary
There is provided a hearing instrument comprising a BTE part to be worn behind the ear of a user (76), the BTE-part comprising: a first side, a second side substantially parallel to the first side, and a third side connecting the first side and the second side, wherein the first and second side are substantially parallel to the user's skin when the BTE part is worn behind the ear.