In-Ear Hearing Device Antenna Protrusion for Efficiency
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Solution Overview
Problem
Current hearing device antennas for 2.4 GHz communication have limited efficiency due to size constraints and head/body loading, resulting in antenna efficiencies of approximately −20 dB, which is inadequate for effective wireless communication.
Innovation Solution
The implementation of an inverted F antenna with a single-ended structure and a shunt connected to a battery for impedance tuning, which protrudes from the housing or faceplate, and a loop antenna with a Nitinol or conductive wire protrusion, enhancing antenna efficiency and reducing mechanical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna is used in a hearing device, then the device can perform wireless communication, but the antenna efficiency is limited to approximately -20 dB due to size constraints and head/body loading
Solution Approach 1:
The antenna is configured to protrude from the housing exterior, transitioning from a fully internal three-dimensional arrangement to a structure that extends into the spatial dimension outside the device. This protrusion allows the antenna to achieve effective radiating length and improve efficiency (from -20 dB to -12 dB) without increasing the internal volume of the hearing device housing.
Solution Approach 2:
The antenna is extracted from the internal housing space and positioned at least partially on the exterior surface. This separation of the antenna from the constrained internal volume allows it to operate with reduced body loading effects and achieve better efficiency while the housing volume remains unchanged.
2Reliability
If the antenna is placed entirely within the housing, then the device maintains a compact form factor, but the antenna efficiency is degraded due to head/body loading and limited space
Solution Approach 1:
The antenna structure incorporates a shunt connected to the battery that enables dynamic impedance tuning. This allows the antenna to adapt its electrical characteristics to optimize performance in the protruding configuration, managing the complexity through active adjustment rather than fixed design.
Solution Approach 2:
The shunt connected to the battery serves dual functions: providing electrical connection for power and enabling impedance tuning for the antenna. This multi-functionality reduces the need for separate components, managing structural complexity while improving wireless communication efficiency.
3Reliability
If the antenna protrudes from the housing, then antenna efficiency improves to approximately -12 dB, but the device becomes more visible and may interfere with daily activities
Solution Approach 1:
Only a portion of the antenna protrudes from the housing exterior, rather than the entire antenna structure. This localized protrusion provides sufficient efficiency improvement (to -12 dB) while minimizing the visual impact and potential interference with the wearer's daily activities and comfort.
Solution Approach 2:
The antenna protrusion is configured asymmetrically, with at least a portion extending from the housing exterior in a direction that optimizes radiating efficiency while considering the ergonomic and aesthetic requirements of the hearing device. This asymmetric configuration balances performance improvement with user comfort.
Data Source
AI summary
Disclosed herein, among other things, are systems and methods for a hearing device antenna. One aspect of the present subject matter includes a hearing device configured to be worn in an ear of a wearer to perform wireless communication. The hearing device includes a housing, hearing electronics within the housing, and an inverted F antenna or loop antenna disposed at least partially in the housing and configured for performing 2.4 GHz wireless communication. In various embodiments, at least a portion of the antenna protrudes from an exterior of the housing.