Hearing aid having a near field resonant parasitic element
A hearing aid includes: a microphone for reception of sound and conversion of the received sound into a corresponding first audio signal; a signal processor for processing the first audio signal into a second audio signal compensating a hearing loss of a user; a speaker connected to an output of the signal processor for converting the second audio signal into an output sound signal; a transceiver connected to the signal processor for wireless data communication; and an antenna for emission and reception of an electromagnetic field, the antenna coupled with the transceiver; wherein the signal processor, the transceiver, the antenna, and interconnecting transmission lines form a circuitry extending over an area of a support substrate, and wherein the hearing aid further comprises a resonant element within a near field of the circuitry to terminate and dissipate unwanted electromagnetic radiation from at least a part of the area.
1. A hearing aid comprising:
a hearing aid housing;
a microphone for reception of sound and conversion of the received sound into a corresponding first audio signal;
a signal processor for processing the first audio signal into a second audio signal compensating a hearing loss of a user of the hearing aid;
a speaker that is connected to an output of the signal processor for converting the second audio signal into an output sound signal;
a transceiver connected to the signal processor for wireless data communication; and
an antenna for emission and reception of an electromagnetic field, the antenna coupled with the transceiver;
wherein the signal processor, the transceiver, the antenna, and interconnecting transmission lines form a circuitry extending over an area of a support substrate, and
wherein the hearing aid further comprises a resonant element in the hearing aid housing, the resonant element located within a near field of the circuitry to dissipate unwanted electromagnetic radiation from at least a part of the circuitry.
2. The hearing aid according to claim 1 , wherein the resonant element comprises a notch filter filtering the unwanted electromagnetic radiation.
3. The hearing aid according to claim 1 , wherein the resonant element comprises a near field resonant parasitic element positioned outside signal paths of the circuitry.
4. The hearing aid according to claim 1 , wherein the area comprises at least two electrical components.
5. The hearing aid according to claim 1 , wherein the resonant element is connected to a ground potential through an energy dissipating component.
6. The hearing aid according to claim 1 , wherein the antenna has an operating frequency that is at least 1 GHz.
7. The hearing aid according to claim 1 , wherein the resonant element is configured to filter signals at about 2.7 GHz.
8. The hearing aid according to claim 1 , further comprising a battery, wherein the resonant element is connected to a ground potential through the battery of the hearing aid.
9. The hearing aid according to claim 8 , wherein the battery is charged by current captured by the resonant element.
10. The hearing aid according to claim 1 , wherein the resonant element comprises a meander shaped element.
11. The hearing aid according to claim 1 , wherein the resonant element comprises a split ring resonator element.
12. The hearing aid according to claim 1 , wherein the resonant element comprises an electromagnetic resonant element.
13. The hearing aid according to claim 1 , further comprising a transmission line connected to the microphone, wherein the resonant element is separate from the transmission line.
14. The hearing aid according to claim 1 , wherein the resonant element has an end that is electrically unconnected to the microphone.
15. The hearing aid according to claim 1 , wherein at least a part of the circuitry is implemented on a printed circuit board, and the resonant element is located between two layers of the printed circuit board.
16. The hearing aid according to claim 1 , wherein the resonant element is mechanically secured to a component located within the hearing aid housing.