Mobile terminal and coil antenna module

• US 9,761,928 B2
• Filed: 11/25/2015
• Issued: 09/12/2017
• 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
• Primary Examiner(s): Rachedine, Mohammed
• Application Number:
  US14/952,803
• Publication Number:
  US 20160261026A1
• Time in Patent Office: 657 Days
• Field of Search: None
• 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 located 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 electric power,

wherein the coil antenna module comprises;

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

a first coil arranged on at least one of the first surface or the second surface;

a second coil, wherein at least a portion of the second coil is positioned outside of the first coil;

a third coil, wherein at least a portion of the third coil is positioned outside of the second coil; and

a magnetic sheet positioned over the first coil, the second coil and the third coil,

wherein respective ends of at least one of the first coil, the second coil, or the third coil are positioned on the first surface,

wherein a number of windings of the first coil is larger than a number of windings of the third coil,

wherein the first coil is used for a wireless charging antenna, the second coil is used for a payment antenna and the third coil is used for a near-field communication (NFC) antenna,

wherein a frequency of the wireless charging antenna is lower than a frequency of the NFC antenna,

wherein the frequency of the wireless charging antenna and the frequency of the NFC antenna are related to the number of windings of the first coil and the third coil, respectively, and

wherein the controller is further configured to communicate payment information associated with a registered credit card to an external terminal through the second antenna in a frequency band of 100 kHz or less.

2. The mobile terminal of claim 1, wherein the controller comprises a frequency matching circuit connected to the ends of at least one 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 wider frequency band width than the second coil and the third coil.

4. The mobile terminal of claim 2, wherein the frequency matching circuit matches the first coil with a frequency band of 100 kHz to 300 kHz,

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

the third coil with a frequency band of 13 MHz or more.

5. The mobile terminal of claim 2, wherein the frequency matching circuit comprises a wireless charging module comprising a circuit connected to the first coil, and a near field communication (NFC) module comprising a circuit connected to the third coil, and

wherein a Q-factor of the wireless charging module and a Q-factor of the first coil are smaller than a Q-factor of the NFC module and a Q-factor of the third coil.

6. The mobile terminal of claim 1 further comprising a first switch and a second switch respectively coupled to the second coil and the third coil,

wherein the second switch is closed when the first switch is open, and

wherein the second switch is open when the first switch is closed.

7. The mobile terminal of claim 1, wherein the controller is further 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.

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

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

9. 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.

10. The mobile terminal of claim 1, wherein inductance of the first coil is largest among inductance of the first coil, the second coil, and the third coil.

11. The mobile terminal of claim 1, wherein at least one of the first coil, the second coil, or the third coil comprises a first portion positioned on the first surface and a second portion positioned on the second surface, and

wherein the first portion and the second portion are connected with each other.

12. The mobile terminal of claim 11, wherein the first portion and the second portion are symmetrically formed with respect to the insulating sheet.

13. A coil antenna module comprising:

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

a first coil arranged on at least one of the first surface or the second surface;

a second coil, wherein at least a portion of the second coil is positioned outside of the first coil;

a third coil, wherein at least a portion of the third coil positioned outside of the second coil; and

a magnetic sheet positioned over the first coil, the second coil and the third coil,

wherein respective ends of at least one of the first coil, the second coil, or the third coil are positioned on the first surface,

wherein a number of windings of the first coil is larger than a number of windings of the second coil and larger than a number of windings of the third coil,

wherein the first coil is used for an wireless charging antenna, the second coil is used for a payment antenna and the third coil is used for a near-field communication (NFC) antenna,

wherein a frequency of the wireless charging antenna is lower than a frequency of the NFC antenna,

wherein the frequency of the wireless charging antenna and the frequency of the NFC antenna are related to the number of windings of the first coil and the third coil, respectively, and

wherein the controller is further configured to communicate payment information associated with a registered credit card to an external terminal through the second antenna in a frequency band of 100 kHz or less.

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 comprises a wireless charging module comprising a circuit connected to the first coil, and a near field communication (NFC) module comprising a circuit connected to the third coil, and

wherein a Q-factor of the wireless charging module and a Q-factor of the first coil are smaller than a Q-factor of the NFC module and a Q-factor of the third coil.

16. The mobile terminal of claim 14, wherein the frequency matching circuit matches the first coil with a wider frequency band width than the second coil and the third coil.

17. The coil antenna module of claim 13, wherein at least one of the first coil, the second coil, or the third coil comprises a first portion positioned on the first surface and a second portion positioned on the second surface, and

wherein the first portion and the second portion are symmetrically formed with respect to the insulating sheet.

18. The coil antenna module of claim 13, wherein the first coil or the third coil transmits a cancellation signal configured to cancel a signal transmitted from the second coil, when the signal is transmitted from the second coil.

19. The coil antenna module of claim 13, wherein the magnetic sheet is a Ferrite sheet having a magnetic permeability (μ

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

20. The coil antenna module of claim 13, 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.