Antenna solution for wireless power transfer—near field communication enabled communication device

• US 9,031,502 B2
• Filed: 12/28/2012
• Issued: 05/12/2015
• Est. Priority Date: 11/16/2012
• Status: Active Grant

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Smith, Aaron
• Primary Examiner(s): LE, THANH C
• Application Number:
  US13/730,760
• Publication Number:
  US 20140141715A1
• Time in Patent Office: 865 Days
• Field of Search: 455/41.1, 455/41.2, 455/67.11, 455/550.1, 455/575.1, 455/106, 340/310.01, 320106-108
• US Class Current: 455/41.1
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/48 Transceivers
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/77 for interrogation
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Various configurations and arrangements of various communication devices and antenna solutions are disclosed. Antenna solutions disclosed herein include a single inductive coupling element configured to resonate at a variety of resonant frequencies suitable for WPT and/or NFC communications. Resonant circuits can be provided for tuning the inductive coupling element to resonant at specific resonant frequency. The antenna solutions can be employed in WPT/NFC enabled communication devices capable of WPT and NFC communication.

Claims

1. An antenna module configured to facilitate wireless power transfer (WPT) and near field communication (NFC) in a WPT/NFC enabled communication device, comprising:

an inductive coupling element configured to resonate at a WPT frequency suitable for WPT communication and an NFC frequency suitable for NFC communication;

a resonant circuit configured to tune the inductive coupling element to the WPT frequency or the NFC frequency,

wherein when placed in a first magnetic field at the WPT frequency indicative of a WPT communication signal, the resonant circuit is configured to tune the inductive coupling element to approximately the WPT frequency such that a first current is induced in the antenna module indicative of the WPT communication signal; and

wherein when placed in a second magnetic field at the NFC frequency indicative of an NFC communication signal, the resonant circuit is configured to tune the inductive coupling element to approximately the NFC frequency such that a second current is induced in the antenna module indicative of the NFC communication signal.

2. The antenna module of claim 1, wherein the NFC communication signal is recovered from the first current induced in the antenna module when placed in the first magnetic field, and

wherein the recovered NFC communication signal is coupled to a WPT/NFC module in the WPT/NFC enabled communication device.

3. The antenna module of claim 1, wherein the WPT communication signal is recovered from the second current induced in the antenna module when placed in the second magnetic field, and

wherein the recovered WPT communication signal is coupled to a WPT/NFC module in the WPT/NFC enabled communication device.

4. The antenna module of claim 1, wherein the resonant circuit comprises:

an NFC resonant circuit configured to tune the inductive coupling element to the NFC frequency; and

a WPT resonant circuit configured to tune the inductive coupling element to the WPT frequency.

5. The antenna module of claim 4, further comprising a filter configured to determine whether:

the first magnetic field is present and, if so, to signal the WPT resonant circuit to tune the inductive coupling element to the WPT frequency;

or

the second magnetic field is present and, if so to signal the NFC resonant circuit to tune the inductive coupling element to the NFC frequency.

6. The antenna module of claim 4, further comprising:

a switching network configured to switch between the WPT resonant circuit and the NFC resonant circuit until the first magnetic field at approximately the WPT frequency or the second magnetic field at approximately the NFC frequency is found, and

wherein the switching network is further configured to signal the WPT resonant circuit to tune the inductive coupling element to the WPT frequency until the WPT communication signal is received when the first magnetic field is found, and

wherein the switching network is further configured to signal the NFC resonant circuit to tune the inductive coupling element to the NFC frequency until the NFC communication signal is received when the second magnetic field is found.

7. The antenna module of claim 1, wherein the resonant circuit is further configured to communicate a second NFC communication signal to another NFC enabled device by tuning the inductive coupling element to the NFC communication frequency.

8. A wireless power transfer and near field communication (WPT/NFC) enabled communication device, comprising:

a plurality of modules configured to provide communication between the WPT/NFC enabled communication device and another communication device,

wherein the plurality of modules includes a WPT/NFC module configured to enable communication between the WPT/NFC enabled communication device and the other communication device;

an inductive coupling element configured to resonate at a WPT frequency suitable for WPT communication and an NFC frequency suitable for NFC communication;

a resonant circuit configured to tune the inductive coupling element to the WPT frequency or the NFC frequency,

wherein when placed in a first magnetic field at the WPT frequency indicative of a WPT communication signal, the resonant circuit is configured to tune the inductive coupling element to approximately the WPT frequency such that a first current is induced in the antenna module indicative of the WPT communication signal; and

wherein when placed in a second magnetic field at the NFC frequency indicative of an NFC communication signal, the resonant circuit is configured to tune the inductive coupling element to approximately the NFC frequency such that a second current is induced in the antenna module indicative of the NFC communication signal.

9. The WPT/NFC enabled communication device of claim 8, wherein the resonant circuit comprises:

an NFC resonant circuit configured to tune the inductive coupling element to the NFC frequency; and

a WPT resonant circuit configured to tune the inductive coupling element to the WPT frequency.

10. The WPT/NFC enabled communication device of claim 9, further comprising:

a filter configured to determine whether;

the first magnetic field is present and, if so, to signal the WPT resonant circuit to tune the inductive coupling element to the WPT frequency;

or

the second magnetic field is present and, if so, to signal the NFC resonant circuit to tune the inductive coupling element to the NFC frequency.

11. The WPT/NFC enabled communication device of claim 9, further comprising:

a switching network configured to switch between the WPT resonant circuit and the NFC resonant circuit until the first magnetic field at approximately the WPT frequency or the second magnetic field at approximately the NFC frequency is found,

wherein the switching network is further configured to signal the WPT resonant circuit to tune the inductive coupling element to the WPT frequency until the WPT communication signal is received when the first magnetic field is found, and

wherein the switching network is further configured to signal the NFC resonant circuit to tune the inductive coupling element to the NFC frequency until the NFC communication signal is received when the second magnetic field is found.

12. The WPT/NFC enabled communication device of claim 8, wherein the WPT/NFC module further comprises a front end module configured to provide an interface between the WPT/NFC enabled communication device and the other communication device.

13. The WPT/NFC enabled communication device of claim 12, wherein the front end module is further configured to recover information from the NFC communication signal and to derive a harvested power from the NFC communication signal.

14. The WPT/NFC enabled communication device of claim 12, wherein the front end module is further configured to receive the WPT communication signal from a WPT transmitter.

15. The WPT/NFC enabled communication device of claim 14, further comprising:

a power management unit configured to receive a harvested power that is derived from the WPT communication signal and to provide a power signal based upon the harvested power to other modules from among the plurality of modules.

16. The WPT/NFC enabled communication device of claim 8, wherein one of the plurality of modules is a cellular communication module configured to provide communication between the WPT/NFC enabled communication device and other devices.

17. The WPT/NFC enabled communication device of claim 8, wherein the WPT/NFC enabled communication device is configured to communicate a second NFC communication signal to another NFC enabled device by tuning the inductive coupling element to produce a third magnetic field indicative of the second NFC communication signal.

18. A wireless power transfer and near field communication (WPT/NFC) module configured to facilitate WPT and NFC in a WPT/NFC enabled communication device, comprising:

an antenna module comprising;

an inductive coupling element configured to resonate at a WPT frequency suitable for WPT communication and an NFC frequency suitable for NFC communication; and

a resonant circuit configured to tune the inductive coupling element to the WPT frequency or the NFC frequency,

wherein when placed in a first magnetic field at the WPT frequency indicative of a WPT communication signal, the resonant circuit is configured to tune the inductive coupling element to approximately the WPT frequency such that a first current is induced in the antenna module indicative of the WPT communication signal;

wherein when placed in a second magnetic field at the NFC frequency indicative of an NFC communication signal, the resonant circuit is configured to tune the inductive coupling element to approximately the NFC frequency such that a second current is induced in the antenna module indicative of the NFC communication signal;

an NFC demodulator configured to demodulate the NFC communication signal from the first magnetic field; and

a WPT power harvesting module configured to harvest power from the second magnetic field.

19. The WPT/NFC module of claim 18, further comprising:

an NFC power harvesting module configured to harvest power from the first magnetic field.

20. The WPT/NFC module of claim 18, further comprising:

an NFC modulator configured to modulate a second NFC communication signal.