MOBILE TERMINAL AND COIL ANTENNA MODULE

• US 20170317405A1
• Filed: 07/13/2017
• Published: 11/02/2017
• Est. Priority Date: 03/04/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: HAN, Kiwon, KIM, Youngtae, LEE, Gwanghoon
• Granted Patent: US 10,148,001 B2
• Time in Patent Office: Days
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence
• CPC Class Codes: H01Q 9/04 Resonant antennas
• CPC Class Codes: H04B 1/3888 Arrangements for carrying or protecting transceivers
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

There is disclosed a mobile terminal including a first case comprising a battery loading portion, a battery loaded in the battery loading portion, a second case coupled to the first case and configured to cover the battery, a coil antenna module arranged between the second case and the battery, and a controller electrically connected to the coil antenna module and configured to transmit and receive a signal or receive an electric power, wherein the coil antenna module includes an insulating sheet, a first coil arranged in a surface of the insulating sheet, a second coil arranged in the first coil, a third coil arranged in the second coil, and a magnetic sheet disposed on the surface of the insulating sheet, and ends of the first, second and third coils are arranged in the surface of the insulating sheet or dividedly arranged in both surfaces of the insulating sheet. The mobile terminal may realize the coil antenna module including a plurality of coils configured to perform diverse manners of wireless communication in a limited area.

Claims

1. A mobile terminal comprising:

a first case comprising a battery loading portion;

a battery positioned in the battery loading portion;

a second case coupled to the first case and positioned over the battery;

a coil antenna module positioned between the second case and the battery; and

a controller electrically coupled to the coil antenna module and configured to transmit and receive a signal or receive an electric power,

wherein the coil antenna module comprises;

an insulating sheet having a first surface and a second surface;

a first coil positioned on at least one of the first surface or the second surface of the insulating sheet;

a second coil positioned within the first coil;

a third coil positioned within the second coil;

a magnetic sheet positioned on either the first surface or the second surface of the insulating sheet,

wherein respective ends of at least one of the first coil, the second coil, or the third coil is positioned on the first surface and respective ends of a remaining coil or coils are positioned on the second surface; and

a first switch and a second switch respectively coupled to the second coil and the third coil, wherein when the first switch is open the second switch is closed, and when the first switch is closed the second switch is open.

2. The mobile terminal of claim 1, wherein the controller comprises a frequency matching circuit connected to the ends of the first coil, the second coil, and the third coil.

3. The mobile terminal of claim 2, wherein the frequency matching circuit matches the first coil with a frequency band of 13 MHz or more, the second coil with a frequency band of 100 kHz or less, and the third coil with a frequency band from 100 kHz to 300 kHz.

4. The mobile terminal of claim 2, wherein the frequency matching circuit comprises a near field communication (NFC) module comprising a circuit matching with a frequency at a high frequency band and connected to the first coil, and the frequency matching circuit performs near field communication using the first coil.

5. The mobile terminal of claim 4, wherein the frequency matching circuit comprises a wireless charging module comprising a circuit matching with a frequency at a low frequency band and connected to the third coil, and the frequency matching circuit charges the battery using the electric power received by the third coil.

6. The mobile terminal of claim 5, wherein a Q-factor of the wireless charging module and a Q-factor of the third coil are smaller than a Q-factor of the NFC module and a Q-factor of the first coil.

7. The mobile terminal of claim 1, wherein at least one of the first coil, the second coil, or the third coil comprises a predetermined portion positioned in one surface of the insulating sheet and another portion positioned in an other surface of the insulating sheet, and

the coils positioned in the one surface and the other surface of the insulating sheet are connected with each other via a via hole formed within the insulating sheet.

8. The mobile terminal of claim 7, wherein a spiral portion of the coil formed in the surface and the coil formed in the other surface are symmetrically formed with respect to the insulating sheet.

9. The mobile terminal of claim 1, wherein the controller is configured to control the first coil or the third coil to transmit a cancellation signal configured to cancel a signal transmitted from the second coil, when the signal is transmitted from the second coil.

10. The mobile terminal of claim 1, wherein the magnetic sheet is a Ferrite sheet having a magnetic permeability (μ

r) at frequencies in a range from 50 kHz to 14 MHz of 130 to 190.

11. The mobile terminal of claim 1, wherein the magnetic sheet covers at least one of the first coil, the second coil, or the third coil, and does not cover the ends of the first coil, the second coil, or the third coil.

12. The mobile terminal of claim 1, wherein a number of windings of the third coil is larger than a number of windings of the first coil and is larger than a number of windings of the second coil.

13. A coil antenna module comprising:

an insulating sheet having a first surface and a second surface;

a first coil positioned on at least one of the first surface or the second surface of the insulating sheet;

a second coil positioned within the first coil;

a third coil positioned within the second coil;

a magnetic sheet positioned on either the first surface or the second surface of the insulating sheet,

wherein respective ends of at least one of the first coil, the second coil, or the third coil is positioned on the first surface and respective ends of a remaining coil or coils are positioned on the second surface; and

a first switch and a second switch respectively coupled to the second coil and the third coil, wherein when the first switch is open the second switch is closed, and when the first switch is closed the second switch is open.

14. The coil antenna module of claim 13, wherein the ends of the first coil, the second coil, and the third coil are attached to a frequency matching circuit.

15. The coil antenna module of claim 14, wherein the frequency matching circuit matches the first coil with a frequency band of 13 MHz or more,

the second coil with a frequency band of 100 kHz or less, and

the third coil with a frequency band from 100 kHz to 300 kHz.

16. The coil antenna module of claim 14, wherein the frequency matching circuit comprises a near field communication (NFC) module comprising a circuit matching with a frequency at a high frequency band and connected to the first coil, and

the frequency matching circuit performs near field communication using the first coil.

17. The coil antenna module of claim 16, wherein the frequency matching circuit comprises a wireless charging module comprising a circuit matching with a frequency at a low frequency band and connected to the third coil, and

the frequency matching circuit charges the battery using the electric power received by the third coil.

18. The coil antenna module of claim 17, wherein a Q-factor of the wireless charging module and a Q-factor of the third coil are smaller than a Q-factor of the NFC module and a Q-factor of the first coil.

19. The coil antenna module of claim 13, wherein at least one of the first coil, the second coil, or the third coil comprises a predetermined portion positioned in one surface of the insulating sheet and another portion positioned in another surface of the insulating sheet, and

the coils positioned in the one surface and the other surface of the insulating sheet are connected with each other via a via hole formed within the insulating sheet.

20. The coil antenna module of claim 19, wherein a spiral portion of the coil formed in the surface and the coil formed in the other surface are symmetrically formed with respect to the insulating sheet.