Antenna arrangement for hearing device applications
View Patent ↗A device having an electric antenna and a magnetic antenna is described, the antennas being spatially arranged in immediate mutual proximity. The electric antenna has at least one current-carrying electric conductor which acts as a resonator for the electric antenna, while the magnetic antenna has a coil with at least one current-carrying conductor loop which acts as an inductor of the magnetic antenna. Thus the electric antenna and the magnetic antenna are spatially arranged relative to each other such that the direction of the current in the electric conductor of the electric antenna extends substantially at right angles to the direction of the current in the conductor loop of the magnetic antenna.
1. A device, comprising:
an electric antenna having at least one current-carrying electric conductor;
a magnetic antenna having a coil with at least one current-carrying conductor loop which acts as an inductor of the magnetic antenna;
a printed circuit board, the electric antenna and the magnetic antenna spatially arranged in immediate mutual proximity on the printed circuit board, the current-carrying electric conductor of the electric antenna extending along the printed circuit board which acts as a resonator, wherein the coil of the magnetic antenna and the current-carrying electric conductor of the electric antenna are arranged in parallel to each other so that an induction of currents in the antennas due to a mutual interference between the antennas is reduced, and
a filter arranged between the electric antenna and the magnetic antenna,
wherein the filter is in the form of an LC high pass, and
wherein the electric antenna further has a first and a second vertical element, the vertical elements and a portion of the current-carrying electric conductor connecting the two vertical elements to each other forming an adapter loop, the adapter loop acting as an inductor of the LC high pass.
2. The device as claimed in claim 1 , wherein a capacitor is arranged at each end of the adapter loop.
3. The device as claimed in claim 1 , wherein the magnetic antenna is in the form of a cylindrical coil with a ferromagnetic core, the ferromagnetic core being made from a material having a low electric conductivity and also having a low frequency-dependent relative permeability for the frequency of the electric antenna.
4. The device as claimed in claim 1 , wherein the magnetic antenna is in the form of a cylindrical coil with a ferromagnetic core, the ferromagnetic core being made from a material having a low electric conductivity and also having a low frequency-dependent relative permeability for the frequency of the electric antenna.
5. The device as claimed in claim 1 , wherein the magnetic antenna is in the form of a cylindrical coil with a ferromagnetic core, the ferromagnetic core being made from a material having a low electric conductivity and also having a low frequency-dependent relative permeability for the frequency of the electric antenna.
6. The device as claimed in claim 1 , wherein the antennas are arranged on opposite sides of the printed circuit board.
7. The device as claimed in claim 1 , wherein the electric antenna is in the form of a printed conductor structure on the printed circuit board.
8. The device as claimed in claim 1 , wherein the electric antenna is in the form of a monopole antenna which is fed by an HF generator, the electric antenna having transformer adaptation to the line impedance of the HF generator.
9. The device as claimed in claim 1 , wherein the magnetic antenna operates on a different radio principle and at a distinctly lower frequency than the electric antenna.
10. The device as claimed in claim 1 , wherein the magnetic antenna operates on a different radio principle and at a distinctly lower frequency than the electric antenna.
11. The device as claimed in claim 1 , wherein the magnetic antenna operates on a different radio principle and at a distinctly lower frequency than the electric antenna.
12. The device as claimed in claim 3 , wherein the magnetic antenna operates on a different radio principle and at a distinctly lower frequency than the electric antenna.
13. The device as claimed in claim 1 , wherein the magnetic antenna operates at a frequency of around 100 kHz and the electric antenna operates at a frequency of around 2.4 GHz.
14. The device as claimed in claim 1 , wherein the electric antenna is configured as Bluetooth antenna.
15. The device as claimed in claim 1 , wherein the device is in the form of a radio relay unit for hearing device applications.
16. The device as claimed in claim 12 , wherein the device is in the form of a radio relay unit for hearing device applications.
17. The device as claimed in claim 1 , wherein the device is in the form of a hearing device.