Wideband antenna and methods

• US 8,618,990 B2
• Filed: 04/13/2011
• Issued: 12/31/2013
• Est. Priority Date: 04/13/2011
• Status: Active Grant

• Current Assignee: Cantor Fitzgerald Securities (Cantor Fitzgerald, L.P.)
• Original Assignee: Pulse Finland Oy (Yageo Corporation)
• Inventors: Somero, Vesna
• Primary Examiner(s): LE, THIEN MINH
• Application Number:
  US13/086,319
• Publication Number:
  US 20120262343A1
• Time in Patent Office: 993 Days
• Field of Search: 343/722, 343/702, 343/844, 343/772, 343/793
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 1/50 Structural association of antennas with earthing switches, lead-in devices or lightning protectors
• CPC Class Codes: H01Q 5/20 characterised by the operating wavebands
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
• CPC Class Codes: H04M 1/026 Details of the structure or mounting of specific components

Abstract

A wideband antenna for use portable radio devices, and methods for operating the same. In one embodiment, a monopole antenna is used within a laptop computing device. The antenna comprises a monopole radiator coupled to an auxiliary ground plane element, and is placed substantially outside of the footprint of the computer display ground plane. In one implementation, the auxiliary ground element is configured not to have electrical connections to the ground plane of the laptop. In another implementation, a solid state switch selectively connects an antenna parasitic element to the main ground thus enabling selective control of the antenna lower frequency operating band.

Claims

1. An antenna apparatus for use in a radio device, the radio device operable in a lower frequency band and an upper frequency band and comprising a feed port and a ground plane, said apparatus comprising:

a monopole radiator;

a substantially planar auxiliary ground element; and

a switching apparatus disposed between the ground plane and the auxiliary ground element and configured to selectively couple the auxiliary ground element to the ground plane;

wherein;

the monopole radiator is coupled at a first location to the feed port via a feed conductor and at a second location to the first auxiliary ground element;

the auxiliary ground element is disposed substantially external to an outside perimeter of the ground plane; and

the auxiliary ground element is disposed substantially external to an outside perimeter of the monopole radiator.

2. The antenna apparatus of claim 1, wherein the monopole radiator is configured to be substantially coplanar with the ground plane.

3. The antenna apparatus of claim 2, wherein the auxiliary ground element is configured to be in a plane substantially perpendicular to the monopole radiator.

4. The antenna apparatus of claim 1, wherein the switching apparatus is adapted to switch the operating frequency of the lower frequency band.

5. The antenna apparatus of claim 4, wherein the lower frequency band comprises a long term evolution (LTE) band covering a frequency range from about 700 MHz to about 960 MHz;

and

the upper frequency band comprises an LTE band covering a frequency range from about 1700 MHz to about 2200 MHz.

6. The antenna apparatus of claim 1, further comprising a plurality of reactive circuits, each coupled to the ground plane and each being selectable by the switching apparatus.

7. The antenna apparatus of claim 6, wherein each reactive circuit comprises an inductor coupled to a respective output port of the switching apparatus.

8. The antenna apparatus of claim 6, wherein each reactive circuit is configured to change an electric length of the auxiliary ground element.

9. The antenna apparatus of claim 1, wherein the switching apparatus is adapted to control operating frequency of the lower frequency band by, at least in part, selectively coupling a plurality of reactive elements between the ground plane and the auxiliary ground element.

10. An antenna apparatus for use in a portable radio device, the portable radio device comprising a feed port and a ground plane, the antenna apparatus comprising:

a first substantially planar auxiliary ground element having a first dimension and a second dimension;

a switching apparatus configured to selectively couple the first substantially planar auxiliary ground element to the ground plane; and

a substantially planar radiator element having a third dimension and a fourth dimension and galvanically connected to the feed port at a first location via a feed conductor, and to the first substantially planar auxiliary ground element at a second location;

wherein both the first substantially planar auxiliary ground element and the substantially planar radiator element are located outside of the ground plane;

wherein;

the first substantially planar auxiliary element is disposed substantially external to the ground plane perimeter yet being coplanar to the ground plane;

the first substantially planar auxiliary element is disposed substantially external to the substantially planar radiator element perimeter yet being coplanar to the substantially planar radiator element;

the first dimension is substantially perpendicular to the third dimension; and

the first substantially planar auxiliary element is configured to increase antenna bandwidth.

11. The antenna apparatus of claim 10, wherein the first substantially planar auxiliary ground element and at least a portion of the substantially planar radiator element are configured to be coplanar to the ground plane.

12. An antenna apparatus for use in a radio device, the radio device comprising a feed and a ground plane, the apparatus comprising:

a monopole radiator;

a first substantially planar auxiliary ground element having a first and a second dimension; and

a switching apparatus configured to selectively couple the first substantially planar auxiliary ground element to the ground plane;

wherein;

the monopole radiator is grounded to the first substantially planar auxiliary ground element at a ground point and is fed by a feed point by the radio device feed via a feed conductor;

the first substantially planar auxiliary ground element is disposed substantially external to an outside perimeter of the ground plane; and

the first substantially planar auxiliary ground element is disposed substantially external to an outside perimeter of the monopole radiator.

13. The antenna apparatus of claim 12, wherein the first substantially planar auxiliary ground element is disposed along a first edge of the ground plane.

14. The antenna apparatus of claim 12, wherein the monopole radiator comprises a first portion and a second portion, the first portion having a third dimension and a fourth dimension, the first dimension being substantially perpendicular to the third dimension.

15. The antenna apparatus of claim 14, wherein:

the ground plane comprises a fifth and a sixth dimension; and

the sixth dimension is substantially parallel to the first dimension; and

the third dimension is substantially parallel to the fifth dimension.

16. The antenna apparatus of claim 12, wherein the first substantially planar auxiliary ground element is configured substantially coplanar with the ground plane.

17. The antenna apparatus of claim 14, wherein:

the first substantially planar auxiliary ground element is configured to be substantially coplanar with the first portion; and

the first dimension is larger than the second dimension.

18. The antenna apparatus of claim 17, wherein the feed conductor comprises a shield coupled to the first substantially planar auxiliary ground element at at least a first location.

19. The antenna apparatus of claim 12, wherein the feed conductor comprises a shield coupled to the first substantially planar auxiliary ground element at a plurality of locations.

20. The antenna apparatus of claim 12, wherein the antenna apparatus is adapted to operate in at least two frequency bands,

at least one of the bands comprising a frequency band compatible with a long term evolution (LTE) system.

21. The antenna apparatus of claim 20, wherein one of the at least two bands comprises a frequency range from about 700 MHz to about 960 MHz, and another of the at least two bands comprises a frequency band from about 1700 MHz to about 2200 MHz.

22. The antenna apparatus of claim 12, further comprising a second auxiliary ground element having a seventh dimension, the second auxiliary ground element electrically coupled to the first substantially planar auxiliary ground element;

wherein;

the third dimension is substantially parallel to the seventh dimension; and

the first dimension is substantially perpendicular to the seventh dimension; and

the second auxiliary ground element is coupled to the first substantially planar auxiliary ground element.

23. The antenna apparatus of claim 22, further comprising the switching apparatus configured to selectively couple the second auxiliary ground element to the ground plane.

24. A portable radio device, comprising:

a feed port;

a ground plane; and

an antenna apparatus comprising;

a radiator;

a first substantially planar auxiliary ground element having a first and a second dimension; and

a switching apparatus configured to selectively couple the first substantially planar auxiliary ground element to the ground plane;

wherein;

the radiator is coupled to the feed port at a first location via a feed conductor, and to the first substantially planar auxiliary ground element at a second location;

the first substantially planar auxiliary ground element is disposed substantially external to an outside perimeter of the ground plane; and

the first substantially planar auxiliary ground element is disposed substantially external to an outside perimeter of the radiator.

25. The portable radio device of claim 24 wherein:

the radiator comprises a first portion and a second portion, the first portion having a third dimension; and

a first dimension is substantially perpendicular to the third dimension.

26. The portable radio device of claim 24, further comprising a second auxiliary ground element having a fifth and a sixth dimension and grounded to the first substantially planar auxiliary ground element, wherein the fifth dimension is substantially perpendicular to the first dimension.

27. The portable radio device of claim 26, wherein the first substantially planar auxiliary ground element and the second auxiliary ground element each are substantially coplanar with the ground plane.

28. The portable radio device of claim 26, wherein the second auxiliary ground element is arranged substantially external to the outside perimeter of the first substantially planar auxiliary ground element.

29. The portable radio device of claim 26, wherein the antenna apparatus further comprises a switching apparatus configured to selectively couple a second auxiliary ground element to the ground plane.

30. The portable radio device of claim 24, wherein the portable radio device is selected from the group consisting of:

a) mobile computer;

b) a cellular telephone; and

c) a portable navigation device.

31. The portable radio device of claim 24, wherein the antenna apparatus is adapted to operate in at least two frequency bands,

at least one of the bands comprising a frequency band compatible with a long term evolution (LTE) system.

32. The portable radio device of claim 31, wherein the switching apparatus is adapted to effect switching an operating band of at least one of the two frequency bands.