Portable electronic apparatus, and battery charging system comprising an antenna arrangement for a radio receiver

1. A portable electronic device, comprising

a radio receiver;

a charging mechanism for charging a battery of the portable electronic device; and

an antenna arrangement for the radio receiver,

wherein the charging mechanism comprises

a first coil arranged to interact with a charging station providing a magnetic field for power distribution to the portable electronic device upon charging;

a rectifier connected to the first coil to receive an alternating current therefrom and to a power supply output to provide a direct current,

and the antenna arrangement comprises

an antenna element comprising the first coil;

a resonator tuned for a frequency band in which the receiver is intended to receive radio transmissions; and

a first series resonance circuit comprising a capacitor and a second coil connected in series between a first terminal of the first coil and a reference voltage of the portable apparatus,

wherein the resonator comprises a second series resonance circuit connected between a second terminal of the first coil and the radio receiver, and

further comprising a third resonance circuit arranged between the second terminal of the first coil and the rectifier to provide a high impedance at frequencies for radio reception and a low impedance for a frequency of the magnetic field for power distribution to the portable electronic device.

2. The portable electronic device according to claim 1 , wherein the resonator comprises the first coil and a capacitor connected in parallel therewith.

3. The portable electronic device according to claim 2 , further comprising a capacitor connected between the second terminal of the first coil and the radio receiver.

4. The portable electronic device according to claim 1 , wherein the third resonance circuit comprises a capacitor and a coil connected in parallel and having a resonance frequency at frequencies for radio reception.

5. The portable electronic device according to claim 1 , wherein the third resonance circuit comprises a capacitor and a coil connected in series and having a resonance frequency at a frequency of the magnetic field for power distribution to the portable electronic device.

6. The portable electronic device according to claim 1 , wherein the power supply output comprises a capacitor electrically connected across output terminals of the power supply output.

7. The portable electronic device according to claim 1 , wherein the radio receiver is arranged to receive radio transmissions within the AM band, and the magnetic field for power distribution is provided in a frequency band different from the AM band.

8. The portable electronic device according to claim 7 , wherein the magnetic field for power distribution is provided in a frequency between 100 kHz and 400 kHz, preferably between 175 kHz and 300 kHz, preferably about 200 kHz.

9. The portable electronic device according to claim 7 , wherein the magnetic field for power distribution is provided in a frequency between 1800 kHz and 2400 kHz, preferably between 1900 kHz and 2200 kHz, preferably about 2000 kHz.

10. The portable electronic device according to claim 1 , wherein the first series resonance circuit is tuned to provide a short circuit for a frequency band in which the receiver is intended to receive radio transmissions.

11. The portable electronic device according to claim 1 , wherein the reference voltage is a ground reference of the portable electronic device.

12. A charging system for a portable electronic device comprising

a charging station providing a magnetic field for power distribution by an alternating current source connected to a power transmission coil for providing the magnetic field; and

a portable electronic device, comprising a radio receiver; a charging mechanism for charging a battery of the portable electronic device; and an antenna arrangement for the radio receiver, wherein the charging mechanism comprises a first coil arranged to interact with the power transmission coil of the charging station upon charging; a rectifier connected to the first coil to receive an alternating current therefrom and to a power supply output to provide a direct current, and the antenna arrangement comprises an antenna element comprising the first coil; a resonator tuned for a frequency band in which the receiver is intended to receive radio transmissions; and a first series resonance circuit comprising a capacitor and a second coil connected in series between a first terminal of the first coil and a reference voltage of the portable apparatus,

wherein the resonator comprises a second series resonance circuit connected between a second terminal of the first coil and the radio receiver, and

further comprising a third resonance circuit arranged between the second terminal of the first coil and the rectifier to provide a high impedance at frequencies for radio reception and a low impedance for a frequency of the magnetic field for power distribution to the portable electronic device.

13. The charging system according to claim 12 , wherein the resonator comprises the first coil and a capacitor connected in parallel therewith.

14. The charging system according to claim 13 , further comprising a capacitor connected between a second terminal of the first coil and the radio receiver.

15. The charging system according to claim 12 , wherein the third resonance circuit comprises a capacitor and a coil connected in parallel and having a resonance frequency at frequencies for radio reception.

16. The charging system according to claim 12 , wherein the third resonance circuit comprises a capacitor and a coil connected in series and having a resonance frequency at a frequency of the magnetic field for power distribution to the portable electronic device.

17. The charging system according to claim 12 , wherein the power supply output comprises a capacitor electrically connected across output terminals of the power supply output.

18. The charging system according to claim 12 , wherein the radio receiver is arranged to receive radio transmissions within the AM band, and the magnetic field for power distribution is provided by the charging station in a frequency band different from the AM band.

19. The charging system according to claim 18 , wherein the magnetic field for power distribution is provided by the charging station in a frequency between 100 kHz and 400 kHz, preferably between 175 kHz and 300 kHz, preferably about 200 kHz.

20. The charging system according to claim 18 , wherein the magnetic field for power distribution is provided by the charging station in a frequency between 1800 kHz and 2400 kHz, preferably between 1900 kHz and 2200 kHz, preferably about 2000 kHz.

21. The charging system according to claim 12 , wherein the first series resonance circuit is tuned to provide a short circuit for a frequency band in which the receiver is intended to receive radio transmissions.

22. The charging system according to claim 12 , wherein the reference voltage is a ground reference of the portable electronic device.