Vee Antenna Layout for Compact 2.4 GHz Hearing Aids
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Solution Overview
Problem
Designing antennas for hearing aids that can efficiently communicate at high frequencies, such as 2.4 GHz for Bluetooth Low Energy technology, while being compact enough to fit within small form factors like in-the-canal and in-the-ear devices is challenging due to size constraints.
Innovation Solution
The use of a dipole antenna configuration with a first segment oriented approximately 90 degrees relative to a second segment, forming a Vee-antenna shape, which allows the antenna to be smaller and fit within the hearing aid housing by leveraging the increased dielectric constant inside the human head, while maintaining performance for frequencies equal to or greater than 2.4 GHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dipole antenna is designed for 2.4 GHz communication with standard length, then communication performance is improved, but the antenna size becomes too large to fit within small hearing aid devices
Solution Approach 1:
The patent positions the antenna such that a first portion resides within the ear canal and a second portion extends outside the ear canal. This spatial arrangement across different dimensions (internal and external to the device housing) allows the antenna to achieve the required electrical length for 2.4 GHz operation while the hearing aid itself remains compact and fits within the ear canal.
2Volume of moving object
If the antenna is made shorter to fit within the hearing aid housing, then device compactness is improved, but high-frequency communication capability deteriorates
Solution Approach 1:
By extending part of the antenna outside the ear canal, the patent effectively increases the available space for antenna deployment without increasing the size of the hearing aid housing. This dimensional approach allows the antenna to maintain its required length for high-frequency operation while the device remains compact.
Solution Approach 2:
The ear canal itself serves as an intermediary space that accommodates the antenna structure. The first portion of the antenna utilizes the ear canal space, while the second portion extends into the external environment, allowing the antenna to achieve proper dimensions without requiring a larger device 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 enables effective high-frequency communication within the constraints of small hearing aid devices, providing better antenna efficiency and ease of integration, while ensuring the antenna fits comfortably within the device.
Implementation Method 1
the techniques described in this disclosure may leverage differences in dielectric constants internal to the ear and external to the ear of a user (e.g., differences in dielectric constant inside the human head and the dielectric constant of air)
Data Source
AI summary
Hearing aids having example antennas tuned to transmit and receive signals having a frequency greater than or equal to 2.4 GHz are described. The antenna includes a first segment and a second segment. The first segment is configured to fit inside a housing of the hearing aid and to be within the ear canal when the hearing aid is inserted into an ear of a wearer. The second segment is configured to be within the housing and disposed near a side of the housing facing toward an outside of the ear canal when the hearing aid is inserted into the ear of the wearer.