Planar inverted-F antenna

• US 6,727,854 B2
• Filed: 06/28/2002
• Issued: 04/27/2004
• Est. Priority Date: 12/19/2001
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Wong, Kin-Lu, Yeh, Shih-Huang, Fang, Shyh-Tirng
• Primary Examiner(s): Nguyen, Hoang V.
• Application Number:
  US10/183,543
• Publication Number:
  US 20030112185A1
• Time in Patent Office: 669 Days
• Field of Search: 343/700.MS, 343/702, 343/846, 343/895, 343/767, 343/770
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 5/364 Creating multiple current paths
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/0442 with particular tuning means

Abstract

A planar inverted-F antenna with a first operating bandwidth and a second operating bandwidth comprises a ground surface, a radiating device, a shorting device, a dielectric material, and a feeding device. The dielectric material is for isolating the radiating device from the ground surface. The feeding device is for transmitting a microwave signal. The radiating device further includes a first radiating element, a second radiating element, and a third radiating element. The first operating bandwidth is formed by the first resonance mode of the first radiating element and the second radiating element. The second operating bandwidth is formed by the second resonance mode of the first radiating element and the second radiating element and the first resonance mode of the third radiating element.

Claims

1. A planar inverted-F antenna (PIFA), wherein the planar inverted-F antenna has a first operating bandwidth and a second operating bandwidth, comprising:

a ground surface;

a shorting device;

a radiating device coupled to the ground surface through a the shorting device, comprising;

a first radiating element, wherein the first radiating element has a first resonance mode and a second resonance mode, and has a first effective length for providing a surface current pathway of the first radiating element;

a second radiating element, wherein the second radiating element has a first resonance mode and a second resonance mode, and has a second effective length for providing a surface current pathway of the second radiating element; and

a third radiating element, coupled to the first and second radiating elements, wherein the third radiating element has a first resonance mode and has a second effective length for providing a surface current pathway of the third radiating element, the first and second effective lengths each being greater than two times the third effective length;

wherein the first operating bandwidth is defined by the first resonance mode of the first radiating element and the first resonance mode of the second radiating element and the second operating bandwidth is defined by the second resonance mode of the first radiating element, the second resonance mode of the second radiating element, and the first resonance mode of the third radiating element;

a dielectric material set between the radiating device and the ground surface for isolating the radiating device from the ground surface; and

a feeding device set on the ground surface and coupled to the radiating device for transmitting a microwave signal.

2. The planar inverted-F antenna according to claim 1, wherein the first radiating element, the second radiating element and the third radiating element are integrated with each other.

3. The planar inverted-F antenna according to claim 1, wherein the first radiating element and the second radiating element are respective metallic strips and the third radiating element is a metallic patch.

4. The planar inverted-F antenna according to claim 3, wherein the metallic patch is rectangular.

5. The planar inverted-F antenna according to claim 3, wherein the first radiating element has a slot.

6. The planar inverted-F antenna according to claim 5, wherein the slot is embedded at an edge of the first radiating element.

7. The planar inverted-F antenna according to claim 5, wherein the slot is embedded in an internal part of the first radiating element.

8. The planar inverted-F antenna according to claim 3, wherein the first radiating element and the second radiating element is are set around the third radiating element.

9. The planar inverted-F antenna according to claim 3, wherein the second radiating element includes a slot.

10. The planar inverted-F antenna according to claim 9, wherein the slot is embedded at an edge of the second radiating element.

11. The planar inverted-F antenna according to claim 9, wherein the slot is embedded in an internal part of the second radiating element.

12. The planar inverted-F antenna according to claim 1, wherein the dielectric material includes the air.

13. The planar inverted-F antenna according to claim 1, wherein the dielectric material includes a substrate.

14. The planar inverted-F antenna according to claim 1, wherein the shorting device is a shorting metallic pin.

15. The planar inverted-F antenna according to claim 1, wherein the first operating bandwidth is within the GSM band and the second operating bandwidth is within the DCS band.

16. The planar inverted-F antenna according to claim 1, wherein the feeding device is a SMA connector.

17. The planar inverted-F antenna according to claim 1, wherein the third radiating element is a metallic patch including a slot.

18. The planar inverted-F antenna according to claim 17, wherein the slot is embedded at an edge of the metallic patch.

19. The planar inverted-F antenna according to claim 17, wherein the slot is embedded in the internal part of the metallic patch.

20. A planar inverted-F antenna (PIFA), wherein the planar inverted-F antenna has a first operating bandwidth and a second operating bandwidth, comprising:

a ground surface;

a radiating device coupled to the ground surface though a shorting metallic pin, comprising;

a metallic patch, wherein the metallic patch has a first resonance mode and a patch effective length for providing a surface current pathway of the metallic patch;

a first metallic strip, wherein the first metallic strip has a first resonance mode and a second resonance mode, and has a first effective length for providing a surface current pathway of the first metallic strip; and

a second metallic strip, coupled to the first metallic strip and the metallic path, wherein the second metallic strip has a first resonance mode and a second resonance mode, and has a second effective length for providing a surface current pathway of the second metallic strip, the first and second effective lengths each being greater than two times the patch effective length;

wherein the first operating bandwidth is by the first resonance mode of the first metallic strip and the first resonance mode of the second metallic strip and the second operating bandwidth is defined by the second resonance mode of the first metallic strip, the second resonance mode of the second metallic strip, and the first resonance mode of the metallic patch;

a dielectric material set between the radiating device and the ground surface for isolating the radiating device from the ground surface; and

a feeding device set on the ground surface and coupled to the radiating device for transmitting a microwave signal.

21. The planar inverted-F antenna according to claim 20, wherein the metallic patch, the first metallic strip, and the second metallic strip are formed integrated with each other.

22. The planar inverted-F antenna according to claim 20, wherein the first metallic strip includes a slot.

23. The planar inverted-F antenna according to claim 22, wherein the slot is embedded at the an edge of the first metallic strip.

24. The planar inverted-F antenna according to claim 22, wherein the slot is embedded in the internal part of the first metallic strip.

25. The planar inverted-F antenna according to claim 20, wherein the dielectric material includes the air.

26. The planar inverted-F antenna according to claim 20, wherein the dielectric material includes a substrate.

27. The planar inverted-F antenna according to claim 20, wherein the first operating bandwidth is within the GSM band and the second operating bandwidth is within the DCS band.

28. The planar inverted-F antenna according to claim 20, wherein the feeding device is a SMA connector.

29. The planar inverted-F antenna according to claim 20, wherein the metallic patch is rectangular.

30. The planar inverted-F antenna according to claim 20, wherein the metallic patch includes a slot.

31. The planar inverted-F antenna according to claim 30, wherein the slot is embedded at the an edge of the metallic patch.

32. The planar inverted-F antenna according to claim 30, wherein the slot is embedded in the internal part of the metallic patch.

33. The planar inverted-F antenna according to claim 20, wherein the second metallic strip includes a slot.

34. The planar inverted-F antenna according to claim 33, wherein the slot is embedded at an edge of the second metallic strip.

35. The planar inverted-F antenna according to claim 33, wherein the slot is embedded in the internal part of the second metallic strip.

36. A planar inverted-F antenna (PIFA), wherein the planar inverted-F antenna has a first operating bandwidth and a second operating bandwidth, comprising:

a ground surface;

a radiating device coupled to the ground surface through a shorting metallic pin, comprising;

a metallic patch, comprising a slot embedded in the internal part of the metallic patch, wherein the metallic patch has a first resonance mode;

a first metallic strip, wherein the first metallic strip has a first resonance mode and a second resonance mode; and

a second metallic strip, wherein the second metallic strip has a first resonance mode and a second resonance mode;

wherein the first operating bandwidth is defined by the first resonance mode of the first metallic strip and the first resonance mode of the second metallic strip and the second operating bandwidth is defined by the second resonance mode of the first metallic strip, the second resonance mode of the second metallic strip, and the first resonance mode of the metallic patch;

a dielectric material set between the radiating device and the ground surface for isolating the radiating device from the ground surface; and

a feeding device set on the ground surface and coupled to the radiating device for transmitting a microwave signal.