Multipurpose antenna unit and a hearing aid comprising a multipurpose antenna unit
First Claim
1. An antenna unit for wireless communication to a multitude of wireless interfaces, the antenna unit comprising a multitude of individual antennas, each antenna comprising a coil comprising at least one winding and the individual antennas embrace the same volume in that the windings of the individual antennas are wound around the same common volume so that the windings of two arbitrary antennas cross each other when viewed in an appropriate cross-sectional plane,wherein at least one of the antenna coils is adapted for providing an inductive coupling to another device,wherein at least one other of the antenna coils is adapted for communication with another device based on electromagnetic radiation, andwherein the inductance of the antenna coil adapted for providing an inductive coupling to another device has a first inductance and the antenna coil adapted for communication with another device based on electromagnetic radiation has a second inductance, wherein the first inductance is greater than the second inductance.
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Abstract
The invention relates to an antenna unit for wireless communication to a multitude of wireless interfaces comprising a multitude of individual antennas, each antenna comprising a coil comprising at least one winding and the individual antennas embrace the same volume and to a hearing aid comprising such antenna unit. The object of the present invention is to provide an antenna unit and a hearing aid providing several wireless interfaces at a relatively small volume. The problem is solved in that at least one of the coils is adapted for providing an inductive coupling to another device. Among the advantages are reduced space/volume, reduced cost and reduced sensitivity to production tolerances compared to a solution comprising individual, separate antennas. The invention may e.g. be used in wireless communication devices, e.g. mobile telephones, head phones, head sets, hearing aids, etc.
65 Citations
33 Claims
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1. An antenna unit for wireless communication to a multitude of wireless interfaces, the antenna unit comprising a multitude of individual antennas, each antenna comprising a coil comprising at least one winding and the individual antennas embrace the same volume in that the windings of the individual antennas are wound around the same common volume so that the windings of two arbitrary antennas cross each other when viewed in an appropriate cross-sectional plane,
wherein at least one of the antenna coils is adapted for providing an inductive coupling to another device, wherein at least one other of the antenna coils is adapted for communication with another device based on electromagnetic radiation, and wherein the inductance of the antenna coil adapted for providing an inductive coupling to another device has a first inductance and the antenna coil adapted for communication with another device based on electromagnetic radiation has a second inductance, wherein the first inductance is greater than the second inductance.
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15. A hearing aid comprising a multitude of wireless interfaces, the hearing aid being adapted to provide that at least one of the wireless interfaces is based on magnetic near field communication, and at least one of the wireless interfaces is based on radiated field communication, the hearing aid comprising an antenna unit comprising a multitude of individual antennas, each antenna comprising a coil comprising at least one winding and the individual antennas being wound around the same common volume so that the windings of two arbitrary antennas cross each other at an angle when viewed in an appropriate cross-sectional plane,
wherein at least one of the antenna coils is coupled to the wireless interface based on magnetic near field communication, and at least one of the other coils is coupled to the wireless interface based on radiated field communication, wherein the antenna coil adapted for magnetic near field communication has a first inductance and the antenna coil adapted for radiated field communication has a second inductance, wherein the first inductance is greater than the second inductance.
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32. An antenna unit for wireless communication to a multitude of wireless interfaces, the antenna unit comprising a multitude of individual antennas, each antenna comprising a coil comprising at least one winding and the individual antennas embrace the same volume in that the windings of the individual antennas are wound around the same common volume so that the windings of two arbitrary antennas cross each other when viewed in an appropriate cross-sectional plane,
wherein at least one of the antenna coils is adapted for providing an inductive coupling to another device at a frequency below 100 MHz, wherein at least one other of the antenna coils is adapted for communication with another device based on radiation in the RF-band, and wherein the inductance of the antenna coil adapted for providing an inductive coupling to another device has a first inductance and the antenna coil adapted for communication with another device based on radiation has a second inductance, wherein the first inductance is greater than the second inductance.
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33. A hearing aid comprising a multitude of wireless interfaces, the hearing aid being adapted to provide that at least one of the wireless interfaces is based on magnetic near field communication, and at least one of the wireless interfaces is based on radiated field communication, the hearing aid comprising an antenna unit comprising a multitude of individual antennas, each antenna comprising a coil comprising at least one winding and the individual antennas being wound around the same common volume so that the windings of two arbitrary antennas cross each other at an angle when viewed in an appropriate cross-sectional plane,
wherein at least one of the antenna coils is coupled to the wireless interface based on a first communication at a frequency below 100 MHz, and at least one of the other coils is coupled to the wireless interface based on a second communication in the RF-band, wherein the antenna coil adapted for the first communication has a first inductance and the antenna coil adapted for the second communication has a second inductance, wherein the first inductance is greater than the second inductance.
Specification