COMPACT RADIATION STRUCTURE FOR DIVERSITY ANTENNAS

• US 20130285867A1
• Filed: 09/17/2010
• Published: 10/31/2013
• Est. Priority Date: 09/17/2010
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Research In Motion Limited (Blackberry Limited)
• Inventors: Wang, Dong, Rao, Qinjiang, Warden, James Paul
• Granted Patent: US 9,735,473 B2
• Time in Patent Office: Days
• US Class Current: 343/770
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/46 with rigid elements diverging from single point

Abstract

An antenna for diversity operation comprising a plurality of connected antenna units (100). The antenna units each having a first radiation element (102) with length of a quarter of a wavelength at a first operating frequency a second radiation element (104) with length of a quarter of a wavelength at a second operating frequency distinct from the first operating frequency, the second radiation element sharing with the first radiation element a segment of the first radiation element. A feed point for coupling a feed to one of said first or second radiation elements such that the elements resonate at the first and second operating frequencies respectively and at substantially orthogonal polarizations. Diversity antennas configured with two or more of the antenna units.

Claims

1. An antenna for diversity operation comprising:

a plurality of connected antenna units each having;

a first radiation element with length of a quarter of a wavelength at a first operating frequency;

a second radiation element with length of a quarter of a wavelength at a second operating frequency distinct from said first operating frequency, the second radiation sharing with said first conductor a segment of said first conductor; and

a feed point for coupling a feed to one of said first or second radiation elements such that the elements resonate at said first and second operating frequencies respectively and at substantially orthogonal polarizations.

2. The antenna of claim 1 wherein the first radiation element is a straight line having first and second ends and the second radiation element is arranged with an open end partially encircling the first radiation element.

3. The antenna of claim 2 wherein the first and second radiation elements are meander lines.

4. The antenna of claim 2 wherein the second radiation element is a meander line.

5. The antenna of claim 2 wherein the second radiation element forms a perimeter of a rectangle around a portion of the first radiation element.

6. The antenna of claim 2 wherein the second radiation element forms a perimeter of a triangle around a portion of the first radiation element.

7. The antenna of claim 1 including a parasitic element arranged in proximity to a first end of said first radiation element.

8. The antenna of claim 7 said parasitic element geometric configuration being selected from one of a line, rectangle or circle.

9. The antenna of claim 2, wherein said plurality of antenna units are formed on a substrate arranged with their first radiation elements connected together at a common connection point at said respective second ends, the antenna units so connected are symmetric relative to at least one symmetry axes and the substrate is spaced from a common ground plane.

10. The antenna of claim 9, including a plurality of feed points each located at said first end of the respective antenna units.

11. The antenna of claim 10, including a shorting pin connected from said common connection point to said ground plane.

12. The antenna of claim 10, wherein said feed is located at said common feed point and said second ends are open.

13. The antenna of claim 2, having two pairs of antenna units formed on a substrate and arranged to be symmetric relative to at least one symmetry axes with each of said pairs having their respective second ends connected for forming said feed point.

14. The antenna of claim 10, said plurality of antenna units are formed on a substrate arranged with their first radiation elements connected at a common connection point at said respective second ends, the antenna units so connected are symmetric relative to at least one symmetry axes, said substrate being mounted orthogonally to a plane of a ground conductor;

and

said feed point being at a radiation element of one of the antenna units in closest distance to the ground plane conductor.

15. The antenna of claim 1, wherein the radiation elements are conductors.

16. The antenna of claim 1, wherein the radiation elements are slots.

17. A wireless communication system comprising an antenna as claimed in claim 1.