Capacitive Hearing Aid Antenna for Wireless Signal Gain
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Solution Overview
Problem
Hearing aids face challenges in achieving effective wireless communication due to their small size and delicate electronic components, which impose design constraints on radio frequency antennas, limiting their performance.
Innovation Solution
The hearing aid incorporates an antenna system with a first feeding structure and a radiating segment that are capacitively coupled, allowing for optimized wireless transmission by adjusting the capacitive coupling and geometry to resonate at specific frequencies, enabling efficient electromagnetic field propagation around the head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional antenna design is used in a hearing aid, then the wireless communication can be established, but the antenna length must be very short due to the small size of the hearing aid housing, which limits the wireless transmission performance
Solution Approach 1:
The patent utilizes the user's head as a reflective surface to extend the effective radiation path of the antenna. By positioning the antenna near the ear and using the head's surface as a reflector, the system creates a folded radiation pattern that effectively increases the antenna's electrical length without increasing its physical dimensions within the hearing aid housing.
Solution Approach 2:
The patent introduces a capacitive feeding structure as an intermediary between the transmission line and the radiating element. This capacitive coupling mechanism allows for impedance transformation and enables the short physical antenna to achieve better resonance characteristics and radiation efficiency by creating an effective electrical length that exceeds the physical dimensions.
2Reliability
If the antenna is made longer to improve wireless transmission, then the transmission performance improves, but the antenna cannot fit in the small hearing aid housing
Solution Approach 1:
The patent extends the antenna's radiation path into the spatial dimension outside the hearing aid by utilizing the head's surface as a reflective boundary. This creates an effective radiation length that is much longer than the physical antenna element, allowing good transmission performance while maintaining a compact form factor that fits within the hearing aid housing.
Solution Approach 2:
The patent uses the head's body mass and conductive surface properties as a counterbalancing element to the short antenna. The head acts as a natural ground plane and reflector, compensating for the insufficient electrical length of the short antenna element and enabling effective radiation despite the limited space in the hearing aid.
3Reliability
If the antenna is positioned to optimize radiation, then the wireless communication capability improves, but the antenna placement is constrained by the presence of other electronic and metallic components in the hearing aid
Solution Approach 1:
The patent creates a localized optimal radiation zone by positioning the antenna specifically near the ear canal opening and utilizing the local geometric features of the ear canal and head surface. This local optimization allows the antenna to achieve good radiation performance in a specific direction (outward from the ear) without being significantly affected by other components located in different regions of the hearing aid housing.
Solution Approach 2:
The patent employs an asymmetric antenna configuration and feeding structure that is specifically tailored to the asymmetric environment of the ear canal and head surface. The capacitive feeding structure and radiating element are positioned and dimensioned to exploit the asymmetric reflective properties of the head, creating optimized radiation patterns that overcome the constraints imposed by other components in the housing.
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 configuration enhances wireless data communication between hearing aids, improving ear-to-ear path gain by 10-15 dB, resulting in robust and low-loss wireless communication.
Implementation Method 1
The first feeding structure may thus exchange energy with the radiating segment through capacitance. The radiating segment may be capacitively coupled to the first feeding structure.
Implementation Method 2
adjusted the capacitive coupling and geometry to resonate at specific frequencies, enabling efficient electromagnetic field propagation around the head
Data Source
AI summary
A hearing aid includes an assembly, the assembly comprising: a microphone for reception of sound and conversion of the received sound into a corresponding first audio signal; a signal processor configured to provide a second audio signal compensating a hearing loss of a user of the hearing aid, wherein the second audio signal is based on the first audio signal; a wireless communication unit; and an antenna system comprising a first feeding structure and a radiating segment; wherein the first feeding structure is connected or coupled to the wireless communication unit; and wherein at least a part of the first feeding structure is galvanically disconnected from the radiating segment, and is capactively coupled to the radiating segment.