In-the-Ear Circular-Shaped Balanced Inverted-A Antenna for Hearing Instruments

Nikolaj Peter Iversen Kammersgaard, Søren Helstrup Kvist, Jesper Thaysen, Kaj Bjarne Jakobsen

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A novel in-the-ear antenna for hearing instruments that operates at 2.45 GHz is presented. The antenna is designed to obtain a polarization perpendicular to the surface of the head in order to optimize the ear-to-ear communication. The antenna consists of a bent dipole with a shorting pin used for impedance matching. It is self-resonant and well matched in the entire ISM band from 2.40 GHz to 2.48 GHz. The simulated and measured peak ear-to-ear path gain |S21| is −74.5 dB and −72.9 dB, respectively. The radiation pattern of the antenna is analyzed and the implications of the radiation pattern on the ear-to-ear communication are discussed.
Original languageEnglish
JournalI E E E Antennas and Wireless Propagation Letters
Pages (from-to)1839 - 1843
Number of pages5
Publication statusPublished - 2016


  • Creeping waves
  • Ear-to-ear
  • Hearing instrument
  • In-the-Ear Hearing Instruments Antenna
  • On-body
  • Path gain
  • WBAN


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