Antenna device for a hearing instrument and hearing instrument
An antenna device for hearing instruments is particularly suited for ITE hearing instruments to be worn in the auditory canal. The system enables improved data transmission with increased transmission bandwidth with insignificantly increased space and energy requirements. An antenna arrangement with a coil core of magnetically permeable material has a preferred transmit and receive spatial direction. A further electric hearing instrument component emits electromagnetic interference radiation. A partially planar shield of magnetically permeable material is disposed between the antenna arrangement and the further component transversely to the transmit and receive spatial direction of the antenna arrangement and at a distance of 50 to 150 micrometers from the coil core. The distance is optimized to the fact that the signal-to-noise ratio has a maximum around 100 micrometers. The shield effect between antenna and further hearing instrument component initially increases with increasing distance and passes into saturation at about 100 micrometers.
1. An antenna device for a hearing instrument, comprising:
an antenna arrangement with a coil core made of magnetically permeable material, said antenna arrangement having a preferred transmit and receive spatial direction;
a further electric hearing instrument component emitting electromagnetic interference radiation when in use;
a shield of magnetically permeable material disposed between said antenna arrangement and said further hearing instrument component, said shield being at least partially planar and being arranged transversely to the transmit and receive spatial direction of said antenna arrangement, and said shield being disposed at a spacing distance of 50 to 150 micrometers from said coil core of said antenna arrangement.
2. The antenna device according to claim 1 , wherein said spacing distance amounts to 75 to 100 micrometers.
3. The antenna device according to claim 1 , wherein the magnetically permeable material of said coil core has a lower magnetic permeability than the magnetically permeable material of said shield.
4. The antenna device according to claim 2 , wherein said shield is a foil made of mu-metal.
5. The antenna device according to claim 1 , wherein said shield is glued to said antenna arrangement.
6. The antenna device according to claim 1 , wherein said further electric hearing instrument component is configured to mainly emit the electromagnetic interference radiation in an interference radiation spatial direction, and wherein said antenna arrangement and said further hearing instrument component are arranged transversely relative to one another to thereby reduce a coupling of interference radiation into said antenna arrangement.
7. The antenna device according to claim 1 , wherein said antenna arrangement comprises a coil antenna defining a first longitudinal direction, said further hearing instrument component comprises a coil arrangement configured to emit the interference radiation and defining a second longitudinal direction, and wherein said first and second longitudinal directions of said coil antenna and said coil arrangement are oriented transversely to one another.
8. The antenna device according to claim 1 , wherein said further hearing instrument component is arranged on said shield.
9. The antenna device according to claim 8 , wherein said further hearing instrument component is affixed to said shield.
10. The antenna device according to claim 1 , wherein said shield, at least at a periphery thereof, surrounds said further hearing instrument component in a direction facing away from said antenna arrangement.
11. The antenna device according to claim 1 , wherein said coil core has a sound channel formed therein and said shield has a sound opening formed therein, and wherein said sound channel and said sound opening are arranged flush relative to one another so as to form a continuous sound channel.
12. The antenna device according to claim 11 , which comprises sound-damping material covering one or both of an inner wall of said sound channel and a side of said shield facing away from said coil core.
13. A hearing instrument, comprising an antenna device according to claim 1 .