Apparatus and method for matching antenna of mobile communication terminal

• US 20060142075A1
• Filed: 12/23/2005
• Published: 06/29/2006
• Est. Priority Date: 12/27/2004
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yun, Jin-Sik, Jang, Sung-Kwon
• Granted Patent: US 7,539,527 B2
• Time in Patent Office: Days
• US Class Current: 455/575.700
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: H04B 1/0458 Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages matching circuits in general H03H
• CPC Class Codes: H04M 1/0214 Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position combined with translation movement H04M1/0235
• CPC Class Codes: H04M 1/0235 Slidable or telescopic telephones, i.e. with a relative translation movement of the body parts; Telephones using a combination of translation and other relative motions of the body parts

Abstract

An apparatus for matching an antenna of a mobile communication terminal and its method are disclosed. The apparatus for matching an antenna of a mobile communication terminal includes a sensing unit for generating a first match signal when an antenna of the mobile communication terminal and a display unit becomes adjacent to each other, and generating a second match signal when the display unit becomes apart from the antenna; a first matching unit for matching first impedance between the antenna and an RF signal generating unit based on the first match signal; and a second matching unit for matching second impedance between the antenna and the RF signal generating unit based on the second match signal.

Claims

1. An apparatus for matching an antenna of a mobile communication terminal comprising:

a sensing unit for generating a first match signal when an antenna of the mobile communication terminal and a display unit becomes adjacent to each other, and generating a second match signal when the display unit becomes apart from the antenna;

a first matching unit for matching first impedance between the antenna and an RF signal generating unit based on the first match signal; and

a second matching unit for matching second impedance between the antenna and the RF signal generating unit based on the second match signal.

2. The apparatus of claim 1, wherein the first or second matching unit compensates a difference value between the first and second impedance.

3. The apparatus of claim 1, wherein the display unit is an LCD (Liquid Crystal Display).

4. The apparatus of claim 1, wherein the mobile communication terminal is a folder type mobile communication terminal.

5. The apparatus of claim 1, wherein the mobile communication terminal is a slide type mobile communication terminal.

6. The apparatus of claim 1, wherein the display unit is installed at a folder of the folder type mobile communication terminal.

7. The apparatus of claim 6, wherein the sensing unit generates the first match signal when the folder is opened.

8. The apparatus of claim 6, wherein the sensing unit generates a second match signal when the folder is closed.

9. The apparatus of claim 1, wherein the display unit is installed at a slider of a slide type mobile communication terminal.

10. The apparatus of claim 9, wherein the sensing unit generates the first match signal when the slider is opened.

11. The apparatus of claim 9, wherein the sensing unit generates the second match signal when the slider is closed.

12. The apparatus of claim 1, wherein the sensing unit comprises:

a magnet installed at the folder or the slider of the mobile communication terminal; and

a Hall effect switch for generating the first or second match signal by a magnetic field of the magnet.

13. The apparatus of claim 12, wherein the sensing unit generates the first match signal when the folder or the slider approaches the Hall effect switch, and generates the second match signal when the folder or the slider becomes apart from the Hall effect switch.

14. A method for matching an antenna of a mobile communication terminal comprising:

matching first impedance between an antenna and an RF signal generating unit of the mobile communication terminal when the antenna and a display unit become adjacent; and

matching second impedance between the antenna and the RF signal generating unit when the antenna and the display unit become apart.

15. The method of claim 14, wherein, in the step of matching the first or second impedance, a difference value between the first and second impedance is compensated.

16. The method of claim 14, wherein the display unit is installed at a folder of a folder type mobile communication terminal.

17. The method of claim 14, wherein the display unit is installed at a slider of a slide type mobile communication terminal.

18. An apparatus for matching an antenna of a mobile communication terminal comprising:

an antenna;

a switch connected with the antenna and receiving a first or second control signal;

a first matching unit connected between the switch and an RF signal generating unit of the mobile communication terminal and matching impedance between the antenna and the RF signal generating unit when the antenna and the display unit of the mobile communication terminal become adjacent;

a second matching unit connected between the switch and the RF signal generating unit and matching impedance between the antenna and the RF signal generating unit when the antenna and the display unit become apart;

a sensing unit for generating a first match signal when the antenna and the display unit become adjacent and generating a second match signal when the antenna and the display unit become apart; and

a controller for generating a first control signal for connecting the first matching unit and the antenna based on the first match signal or generating a second control signal for connecting the second matching unit and the antenna based on the second match signal.

19. An apparatus for matching an antenna of a mobile communication terminal comprising:

an antenna;

an RF switch electrically connected with an RF signal generating unit of the mobile communication terminal and receiving first or second control signal;

a first matching unit connected between the RF switch and the antenna and matching impedance between the antenna and the RF signal generating unit when the antenna and the display unit of the mobile communication terminal become adjacent;

a second matching unit connected between the RF switch and the antenna, and matching impedance between the antenna and the RF signal generator when the antenna and the display unit become apart;

a sensing unit for generating a first match signal when the antenna and the display unit become adjacent, and generating a second match signal when the antenna and the display unit become apart; and

a controller for generating a first control signal for connecting the first matching unit and the RF signal generating unit based on the first match signal, or generating a second control signal for connecting the second matching unit and the RF signal generating unit based on the second match signal.

20. An apparatus for matching an antenna of a mobile communication terminal comprising:

an antenna;

a first switch connected with the antenna and receiving a first or second control signal;

a first matching unit connected with the first switch and matching impedance between the antenna and an RF signal generating unit of the mobile communication terminal when the antenna and the display unit of the mobile communication terminal become adjacent;

a second matching unit connected with the first switch and matching impedance between the antenna and the RF signal generating unit when the antenna and the display unit become apart;

a second switch connected between the first matching unit and the RF signal generating unit, connected between the second matching unit and the RF signal generating unit, and receiving a third or fourth control signal;

a sensing unit for generating a first match signal when the antenna and the display unit become adjacent and generating a second match signal when the antenna and the display unit become apart; and

a controller for generating a first control signal for connecting the antenna and the first matching unit and a third control signal for connecting the first matching unit and the RF signal generating unit based on the first match signal, or generating a second control signal for connecting the antenna and the second matching unit and a fourth control signal for connecting the second matching unit and the RF signal generating unit based on the second match signal.

21. An apparatus for matching an antenna of a mobile communication terminal comprising:

an antenna;

a first matching unit connected with the antenna, an matching impedance between the antenna and an RF signal generating unit of the mobile communication terminal when the antenna and a display unit of the mobile communication terminal become adjacent;

a second matching unit connected in series between the first matching unit and the RF signal generating unit, and matching impedance between the antenna and the RF signal generating unit when the antenna and the display unit become adjacent;

a switch connected in parallel with the first matching unit and receiving a first or second control signal;

a sensing unit for generating a first match signal when the antenna and the display unit become adjacent, and generating a second match signal when the antenna and the display unit become apart; and

a controller for generating a first control signal for outputting an RF signal outputted from the RF signal generating unit to the antenna through the first and second matching units based on the first match signal, or generating a second control signal for outputting the RF signal outputted from the RF signal generating unit to the antenna through the second matching unit based on the second match signal.