Internal antenna of wireless communication terminal

• US 20060017629A1
• Filed: 07/05/2005
• Published: 01/26/2006
• Est. Priority Date: 07/06/2004
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hong Teuk, Ko, Young Joon
• Granted Patent: US 7,312,755 B2
• Time in Patent Office: Days
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

An internal antenna of a wireless communication terminal, in which internal style folded monopole antenna is installed, is provided. The internal antenna of a wireless communication terminal includes a folded monopole antenna. The folded monopole antenna includes two folded radiation planes having a quarter wavelength, and reactances loaded to predetermined positions of the two radiation planes. Therefore, a space for installing the antenna in the terminal is minimized, and due to the no directional characteristics, the internal antenna can be applied to a wireless communication system of dual bandwidths.

Claims

1. An internal antenna of a wireless communication terminal comprising:

a first folded radiation plane having an end to which an input port is connected;

a second folded radiation plane having an end to which a shorting pin is connected;

a transmission line for connecting the first radiation plane to the second radiation plane; and

a junction branched from the transmission line.

2. The internal antenna of a wireless communication terminal as claimed in claim 1, wherein the first and second radiation planes have a quarter wavelength.

3. The internal antenna of a wireless communication terminal as claimed in claim 1, wherein the transmission line and the junction are positioned outside the first and second radiation planes.

4. The internal antenna of a wireless communication terminal as claimed in claim 1, wherein the transmission line and the junction are positioned inside the first and second radiation planes.

5. The internal antenna of a wireless communication terminal as claimed in claim 1, wherein reactances are loaded to the ends of the junction, respectively.

6. The internal antenna of a wireless communication terminal as claimed in claim 5, wherein each of the reactances includes a stub having opened ends.

7. The internal antenna of a wireless communication terminal as claimed in claim 1, wherein the shorting pin is connected to a finite ground.

8. The internal antenna of a wireless communication terminal as claimed in claim 1, wherein the input port is connected to a feeding pad.

9. An internal antenna of a wireless communication terminal comprising:

a first folded radiation plane having an end to which an input port is connected;

a second folded radiation plane having an end to which a shorting pin is connected;

a transmission line for connecting the first radiation plane to the second radiaton plane;

junctions branched into two from the transmission line; and

a stub having opened ends and connected to the ends of the junction.

10. The internal antenna of a wireless communication terminal as claimed in claim 9, wherein the stub comprises a plurality of stubs.

11. The internal antenna of a wireless communication terminal as claimed in claim 10, wherein the plural stubs comprise lines folded at least one time.

12. The internal antenna of a wireless communication terminal as claimed in claim 11, wherein each of the lines of the stubs has a length shorter than a quarter wavelength.

13. The internal antenna of a wireless communication terminal as claimed In claim 11, wherein each of the lines of the stubs ranges from −

90 degrees to +90 degrees.

14. The internal antenna of a wireless communication terminal as claimed in claim 10, wherein the plural stubs are folded toward a ground.

15. The internal antenna of a wireless communication terminal as claimed in claim 10, wherein the plural stubs are arranged outside or/and inside the first and second radiation planes.

16. The internal antenna of a wireless communication terminal as claimed in claim 10, wherein the plural stubs are parallel to a ground.

17. The internal antenna of a wireless communication terminal as claimed in claim 9, wherein the shorting pin is shorted to a finite ground having a slot.

18. An internal antenna of a wireless communication terminal comprising a folded monopole antenna, the folded monopole antenna comprising:

two folded radiation planes having a quarter wavelength; and

reactances loaded to predetermined positions of the two radiation planes.

19. The internal antenna of a wireless communication terminal as claimed in claim 18, wherein the folded monopole antenna is made of a conductive material to which line patterns can be formed by the vapor deposition.

20. The internal antenna of a wireless communication terminal as claimed in claim 18, wherein the folded monopole antenna has no direction.