ANTENNA DEVICE AND MOBILE TERMINAL HAVING THE SAME

• US 20130342411A1
• Filed: 06/20/2013
• Published: 12/26/2013
• Est. Priority Date: 06/21/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: JUNG, Byungwoon, RHYU, Hanphil, RHO, Sungjung, LEE, Jaewoo, KWAK, Daeyong
• Granted Patent: US 9,337,543 B2
• Time in Patent Office: Days
• US Class Current: 343/767
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• CPC Class Codes: H01Q 13/106 Microstrip slot antennas patch antenna elements H01Q9/0407
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 5/307 Individual or coupled radiating elements, each element being fed in an unspecified way
• CPC Class Codes: H04M 1/026 Details of the structure or mounting of specific components
• CPC Class Codes: H04M 1/0277 for a printed circuit board assembly

Abstract

A mobile terminal comprises: a terminal body having an upper part and a lower part; and an antenna device disposed on the upper part or the lower part of the terminal body, and configured to transmit and receive radio signals, wherein the antenna device comprises: a first member and a second member which form a slot of which one side is open; a feeding portion having one end connected to one of the first member and the second member such that the antenna device resonates in a first frequency band, and forming an electric field in the slot; and a feeding extension portion extending from the feeding portion such that the antenna device resonates in a second frequency band.

Claims

1. An antenna device, comprising:

a first member and a second member which form a slot having an open part which is open and a connection part which is closed;

a feeding portion having one end connected to one of the first member and the second member such that the antenna device resonates in a first frequency band, and forming an electric field in the slot; and

a feeding extension portion extending from the feeding portion such that the antenna device resonates in a second frequency band.

2. The antenna device of claim 1, wherein a length of the slot, which is from the connection part to the open part of the slot, corresponds to λ

/4 or λ

/8 with respect to a wavelength of a center frequency of the first frequency band.

3. The antenna device of claim 2, wherein the feeding portion is spaced from the connection part by a first distance, and

wherein the feeding extension portion extends from the feeding portion by a second distance.

4. The antenna device of claim 3, wherein the first distance is formed such that an impedance of the center frequency of the first frequency band is within 50 ohm by the feeding portion, and

wherein the second distance is formed such that an impedance of a center frequency of the second frequency band is within 50 ohm by the feeding extension portion.

5. The antenna device of claim 4, wherein the feeding portion comprises a shunt element.

6. The antenna device of claim 4, wherein the feeding extension portion comprises a series element.

7. The antenna device of claim 1, wherein the feeding extension portion is formed on one of the first member and the second member.

8. The antenna device of claim 1, wherein at least part of the feeding extension portion is spaced from one of the first member and the second member, and extends in parallel thereto.

9. The antenna device of claim 1, further comprising a third member extending from one of the first member and the second member with a prescribed length such that the antenna device resonates at a third frequency adjacent to the center frequency of the second frequency band, and the third member configured to extend a bandwidth of the second frequency band.

10. A mobile terminal, comprising:

a terminal body having an upper part and a lower part; and

an antenna device disposed on the upper part or the lower part of the terminal body, and configured to transmit and receive radio signals,

wherein the antenna device comprises;

a first member and a second member which form a slot having an open part which is open and a connection part which is closed;

a feeding portion having one end connected to one of the first member and the second member such that the antenna device resonates in a first frequency band, and forming an electric field in the slot; and

a feeding extension portion extending from the feeding portion such that the antenna device resonates in a second frequency band.

11. The mobile terminal of claim 10, wherein the upper part or the lower part of the terminal body, to which the antenna device is mounted, is formed to be slimmer than other parts of the terminal body.

12. The mobile terminal of claim 10, wherein one of the first member and the second member is a conductive frame mounted in the terminal body, and configured to support inside of the terminal body.

13. The mobile terminal of claim 10, wherein one of the first member and the second member is a flexible printed circuit board (FPCB) mounted in the terminal body, and configured to transmit a signal generated from a user input unit to a controller.

14. The mobile terminal of claim 10, wherein one of the first member and the second member is a flexible printed circuit board (FPCB) mounted in the terminal body, and configured to transmit signals input and output from a socket connected to an external device, to a controller.

15. The mobile terminal of claim 10, wherein one of the first member and the second member is a conductive case which forms an appearance of the terminal body.

16. The mobile terminal of claim 10, wherein one of the first member and the second member is a multi-layered printed circuit board having a ground.

17. The mobile terminal of claim 10, wherein a length of the slot, which is from the connection part to the open part of the slot, corresponds to λ

/4 or λ

/8 with respect to a wavelength of a center frequency of the first frequency band.

18. The mobile terminal of claim 17, wherein the feeding portion is spaced from the connection part by a first distance, and

wherein the feeding extension portion extends from the feeding portion by a second distance.

19. The mobile terminal of claim 18, wherein the first distance is formed such that an impedance of the center frequency of the first frequency band is within 50 ohm by the feeding portion, and

wherein the second distance is formed such that an impedance of a center frequency of the second frequency band is within 50 ohm by the feeding extension portion.

20. The mobile terminal of claim 10, wherein the feeding extension portion is formed on one of the first member and the second member.

21. The mobile terminal of claim 10, wherein at least part of the feeding extension portion is spaced from one of the first member and the second member, and extends in parallel thereto.

22. The mobile terminal of claim 10, further comprising a third member extending from one of the first member and the second member with a prescribed length such that the antenna device resonates at a third frequency adjacent to the center frequency of the second frequency band, and the third member configured to extend a bandwidth of the second frequency band.

23. The mobile terminal of claim 10, further comprising a conductive case which forms an appearance of the terminal body, and

wherein an opening communicated with the slot is formed at the conductive case.

24. The mobile terminal of claim 23, wherein the conductive case comprises a first conductive case and a second conductive case, and

wherein the first conductive case is separated from the second conductive case by the opening and the socket.

25. The mobile terminal of claim 24, wherein a third member, which is diverged from one of the first member and the second member such that a bandwidth of the second frequency band is extended, is formed in parallel to the first conductive case.

26. The mobile terminal of claim 10, wherein another antenna device, which is configured to transmit and receive radio signals in a fourth frequency band, is disposed to cover the antenna device.