Integrated tri-band antenna for laptop applications

• US 6,950,069 B2
• Filed: 12/13/2002
• Issued: 09/27/2005
• Est. Priority Date: 12/13/2002
• Status: Active Grant

• Current Assignee: Lenovo PC International Limited (Lenovo Group Ltd.)
• Original Assignee: International Business Machines Corporation
• Inventors: Gaucher, Brian Paul, Liu, Duixian
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US10/318,816
• Publication Number:
  US 20040113848A1
• Time in Patent Office: 1,019 Days
• Field of Search: 343/767, 343/829, 343/846, 343/702, 343/700.MS
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/24 with receiving set
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

Integrated (embedded) tri-band antennas for use with portable devices such as laptop computers. In one aspect, an integrated tri-band antenna for a portable device comprises a first element having a resonant frequency in a first frequency band, a second element having a resonant frequency in a second frequency band, a third element having a resonant frequency in a third frequency band, and a ground element for grounding the first, second and third elements. The first, second and third elements and ground element may be metallic elements formed on a PCB (printed circuit board), wherein the first element is connected to a signal feed, and wherein the PCB is mounted to a metallic support frame of a display unit of the portable device.

Claims

1. A tri-band antenna for a portable device, comprising:

a first element having a resonant frequency in a first frequency band;

a second element having a resonant frequency in a second frequency band; and

a third element having a resonant frequency in a third frequency band;

wherein the first element is connected to a signal feed, wherein the second and third elements are grounded, and wherein the tri-band antenna is integrated within the portable device, wherein the first and second elements comprise metal strips formed on a first side of a PCB (printed circuit board) substrate, and wherein the third element comprises a metal strip formed on second side of the PCB substrate.

2. The antenna of claim 1, wherein the first frequency band is about 2.4 GHz to about 2.5 GHz, wherein the second frequency band is about 5.15 GHz to about 5.35 GHz and wherein the third frequency band is about 5.47 GHz to about 5.825 GHz.

3. The antenna of claim 1, wherein the first element is connected to ground.

4. The antenna of claim 1, wherein the first element is one of an inverted-F antenna and a slot antenna.

5. The antenna of claim 1, wherein the second element is one of an inverted-L antenna and a slot antenna.

6. The antenna of claim 1, wherein the signal feed comprises a coaxial transmission line having a center conductor connected to the first element.

7. The antenna of claim 1, wherein the portable device comprises a portable computer comprising a display unit with a metal support frame, and wherein the PCB is mounted to the metal support frame of the display unit.

8. The antenna of claim 7, wherein a plane of the antenna is disposed substantially parallel to a plane of the metal support frame.

9. The antenna of claim 7, wherein a plane of the antenna is disposed substantially perpendicular to a plane of the metal support frame.

10. A tri-band antenna for a portable device, wherein the portable device comprises a signal feed and a display unit having a metallic support frame, the tri-band antenna comprising:

a first element having a resonant frequency in a first frequency band;

a second element having a resonant frequency in a second frequency band;

a third element having a resonant frequency in a third frequency band; and

a ground element for grounding one of the first element, the second element, the third element and any combination thereof,

wherein the first, second and third elements and ground element comprise metallic elements formed on a PCB (printed circuit board), wherein the first element is connected to the signal feed, and wherein the PCB is mounted to the metallic support frame of the display unit.

11. The antenna of claim 10, wherein the portable device is a portable computer.

12. The antenna of claim 10, wherein the first frequency band is about 2.4 GHz to about 2.5 GHz, wherein the second frequency band is about 5.15 GHz to about 5.35 GHz and wherein the third frequency band is about 5.47 GHz to about 5.825 GHz.

13. The antenna of claim 10, wherein the first element is one of an inverted-F antenna and a slot antenna.

14. The antenna of claim 10, wherein the second element is one of an inverted-L antenna and a slot antenna.

15. The antenna of claim 10, wherein the third element is tab-shaped.

16. The antenna of claim 15, wherein the third element has a sloped edge.

17. The antenna of claim 10, wherein the first and second elements are formed on a first side of the PCB and wherein the third element is formed on a second side of the PCB.

18. The antenna of claim 10, wherein the signal feed comprises a coaxial transmission line having a center conductor connected to the first element and an outer conductor connected to the ground element.

19. The antenna of claim 10, wherein a plane of the PCB is disposed substantially parallel to a plane of the metallic support frame.

20. The antenna of claim 10, wherein a plane of the PCB is disposed substantially perpendicular to a plane of the metallic support frame.

21. A tri-band antenna for a portable computer having a display unit, the tri-band antenna comprising:

a first element having a resonant frequency in a first frequency band;

a second element having a resonant frequency in a second frequency band;

a third element having a resonant frequency in a third frequency band; and

a ground element for grounding one of the first element, the second element, the third element and any combination thereof,

wherein the first, second, and third elements comprise planar metal strips, and wherein the third element is oriented in a first plane that is adjacent to, and separated by a predetermined coupling distance from, a second plane comprising the first and second elements, wherein the first, second and third elements are integrally formed from a stamped portion of a metal sheet, and wherein the first, second and third elements are integrally formed within the display unit of the portable computer.

22. The antenna of claim 21, wherein the first frequency band is about 2.4 GHz to about 2.5 GHz, wherein the second frequency band is about 5.15 GHz to about 5.35 GHz and wherein the third frequency band is about 5.47 GHz to about 5.825 GHz.

23. The antenna of claim 21, wherein the first element is one of an inverted-F antenna and a slot antenna.

24. The antenna of claim 21, wherein the second element is one of an inverted-L antenna and a slot antenna.

25. The antenna of claim 21, wherein the first element is connected to a signal feed, wherein the signal feed comprises a coaxial transmission line having a center conductor connected to the first element.