Hearing aid having combined antennas

1. A hearing aid having a hearing aid housing, the hearing aid housing having a first end and a second end and comprising:

a microphone configured to receive an audio signal;

a processing unit configured to process the audio signal for compensating a hearing loss of a user;

a battery provided closer to a second end of the hearing aid housing than to a first end of the hearing aid housing;

one or more wireless communication units for wireless communication;

at least a part of a first antenna for emission and reception of an electromagnetic field, the first antenna being interconnected with one of the one or more wireless communication units; and

a second antenna for emission and reception of an electromagnetic field, the second antenna being interconnected with one of the one or more wireless communication units, wherein the battery has a circular cross section, and a center axis extending through a center of the circular cross section, the center axis being perpendicular to the circular cross section, and wherein a first distance between the second antenna and the second end of the hearing aid housing is shorter than a second distance between the center of the circular cross section of the battery and the second end of the hearing aid housing;

wherein the second antenna comprises a magnetic core and an electrical conductor wound around the magnetic core.

2. The hearing aid according to claim 1 , wherein the second antenna has a longitudinal extension in a second direction.

3. The hearing aid according to claim 2 , wherein the first antenna is provided in one or more planes, the one or more planes being 90 degrees+/−35 degrees to the second direction.

4. The hearing aid according to claim 1 , wherein the first antenna is configured for radiation in a first frequency range, and the second antenna is configured for radiation in a second frequency range.

5. The hearing aid according to claim 1 , wherein the first antenna is an electric antenna and the second antenna is a magnetic antenna.

6. The hearing aid according to claim 1 , wherein the first antenna is configured to operate at a frequency above 800 MHz during use.

7. The hearing aid according to claim 1 , wherein the second antenna is configured to operate at a frequency below 100 MHz during use.

8. The hearing aid according to claim 1 , wherein the second antenna is configured to operate at a frequency between 1 MHz and 100 MHz.

9. The hearing aid according to claim 1 , wherein the first antenna is configured for data communication at a first bit rate.

10. The hearing aid according to claim 1 , wherein the second antenna is configured for data communication at a second bit rate, the second bit rate being larger than the first bit rate.

11. A binaural hearing aid system comprising a first and a second hearing aid to be provided at a first and a second ear of the user, respectively, wherein one or both of the hearing aids is a hearing aid according to claim 1 .

12. The hearing aid according to claim 1 , wherein the second antenna has an elongated configuration extending in a direction that is parallel to the center axis of the battery.

13. The hearing aid according to claim 1 , wherein the hearing aid housing has a surface configured to abut against a user of the hearing aid, and wherein the second antenna has a longitudinal axis forming a non-zero angle relative to a plane of the surface.

14. The hearing aid according to claim 13 , wherein the longitudinal axis of the second antenna is perpendicular to the plane of the surface.

15. A hearing aid having a hearing aid housing, the hearing aid housing having a first end and a second end and comprising:

a microphone configured to receive an audio signal;

a processing unit configured to process the audio signal for compensating a hearing loss of a user;

a battery provided closer to a second end of the hearing aid housing than to a first end of the hearing aid housing;

one or more wireless communication units for wireless communication;

at least a part of a first antenna for emission and reception of an electromagnetic field, the first antenna being interconnected with one of the one or more wireless communication units; and

a second antenna for emission and reception of an electromagnetic field, the second antenna being interconnected with one of the one or more wireless communication units, wherein the battery has a circular cross section, and a center axis extending through a center of the circular cross section, the center axis being perpendicular to the circular cross section, and wherein a first distance between the second antenna and the second end of the hearing aid housing is shorter than a second distance between the center of the circular cross section of the battery and the second end of the hearing aid housing;

a first hearing aid part comprising the housing, the first hearing part configured to be positioned behind the ear of a user;

a second hearing aid part being configured to be positioned in the ear of a user; and

a coupling element coupling the first hearing aid part and the second hearing aid part, wherein the at least a part of the first antenna extends in the coupling element and also in the housing.

16. The hearing aid according to claim 15 , wherein the first hearing aid part comprises the battery, and wherein the second hearing aid part comprises a speaker.

17. The hearing aid according to claim 15 , wherein the coupling element comprises at least a part of the first antenna.