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Johansson, Anders J.
Lund University
in Cooperation with on an Cooperation-Score of 37%
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document
Miniaturized antennas for link between binaural hearing aids
Abstract
We have investigated the possibility of using the<br/> 2.45 GHz ISM band for communication between binaural<br/> hearing aids. The small size of a modern hearing aid makes it<br/> necessary to miniaturize the antennas to make this feasible.<br/> Two different types of hearing aid placements have been<br/> investigated: in the outer ear and in the ear canal. Both put<br/> strict demands on the size of the antenna, which have been<br/> miniaturized by applying disc loads and high permittivity materials.<br/> The investigations have been done by FDTD simulation<br/> of a modified SAM phantom head, where we have included a<br/> simple model of the ear canal. Simulations show that the outer<br/> ear placement is better, as it gives a total link loss of 48 dB.<br/> The placement in the ear canal gives a total link loss of 92 dB.