Mobile wireless communications device with diversity wireless local area network (LAN) antenna and related methods

• US 7,912,435 B2
• Filed: 01/17/2008
• Issued: 03/22/2011
• Est. Priority Date: 08/23/2004
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Qi, Yihong, Man, Ying Tong, Cooke, Adrian, Jarmuszewski, Perry
• Primary Examiner(s): Jackson; Blane J
• Application Number:
  US12/015,844
• Publication Number:
  US 20080123609A1
• Time in Patent Office: 1,160 Days
• Field of Search: 455/442, 455/552.1, 455/553.1, 455/269, 455/272, 455/273, 455/274, 343/702, 343/741, 343/742, 343/743, 343/700.MS
• US Class Current: 455/272
• CPC Class Codes: H01Q 5/28 Arrangements for establishing polarisation or beam width over two or more different wavebands
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making

Abstract

A mobile wireless LAN communications device may include a portable, handheld housing, and a wireless LAN transceiver carried by the housing. A polarization diversity wireless LAN antenna may be included for cooperating with the wireless LAN transceiver to communicate over a wireless LAN. The polarization diversity wireless LAN antenna may include a first antenna element coupled to the wireless LAN transceiver having a first shape and a first polarization, and a second antenna element coupled to the wireless LAN transceiver having a second shape different from the first shape. The second antenna element may also have a second polarization different from the first polarization.

Claims

1. A mobile wireless local area network (LAN) communications device comprising:

a portable, handheld housing;

a wireless LAN transceiver carried by said portable, handheld housing; and

a wireless LAN antenna for cooperating with said wireless LAN transceiver to communicate over a wireless LAN, said wireless LAN antenna comprising

a first antenna element coupled to said wireless LAN transceiver having a first shape, and

a second antenna element coupled to said wireless LAN transceiver having a second shape different from the first shape;

at least one of said first and second antenna elements comprising a feed branch and a loop branch having a first end coupled to said feed branch, a second end adjacent said feed branch and separated therefrom by a gap, and a loop-back section extending between the first and second ends;

said feed branch comprising first and second feed points, the first end of said loop branch being coupled to the first feed point, and the second end of said loop branch being adjacent the second feed point.

2. The mobile wireless LAN communications device of claim 1 wherein said first and second antenna elements have different gain patterns, and wherein the different gain patterns have a substantially equal main lobe gain.

3. The mobile wireless LAN communications device of claim 1 wherein said loop-back section of said loop branch comprises at least one arcuate portion.

4. The mobile wireless LAN communications device of claim 1 further comprising:

a cellular transceiver carried by said portable, handheld housing; and

a cellular antenna for cooperating with said cellular transceiver to communicate over a cellular communications network.

5. The mobile wireless LAN communications device of claim 1 further comprising a circuit board carried by said housing and having first and second opposing major surfaces;

and wherein said first and second antenna elements comprise planar conductive elements on the first major surface of said circuit board.

6. The mobile wireless LAN communications device of claim 1 further comprising a matching network coupled between said wireless LAN transceiver and at least one of said first and second antenna elements.

7. A mobile wireless local area network (LAN) communications device comprising:

a portable, handheld housing;

a circuit board carried by said housing;

a cellular transceiver carried by said circuit board;

a cellular antenna for cooperating with said cellular transceiver to communicate over a cellular communications network;

a wireless LAN transceiver carried by said circuit board; and

a wireless LAN antenna for cooperating with said wireless LAN transceiver to communicate over a wireless LAN, said wireless LAN antenna comprising

a first antenna element coupled to said wireless LAN transceiver having a first shape, and

a second antenna element coupled to said wireless LAN transceiver having a second shape different from the first shape;

said first and second antenna elements comprising planar conductive elements on said circuit board;

at least one of said first and second antenna elements comprising a feed branch and a loop branch having a first end coupled to said feed branch, a second end adjacent said feed branch and separated therefrom by a gap, and a loop-back section extending between the first and second ends;

said feed branch comprising first and second feed points, the first end of said loop branch being coupled to the first feed point, and the second end of said loop branch being adjacent the second feed point.

8. The mobile wireless LAN communications device of claim 7 wherein said first and second antenna elements have different gain patterns, and wherein the different gain patterns have a substantially equal main lobe gain.

9. The mobile wireless LAN communications device of claim 7 wherein said loop-back section of said loop branch comprises at least one arcuate portion.

10. The mobile wireless LAN communications device of claim 7 further comprising a matching network coupled between said wireless LAN transceiver and at least one of said first and second antenna elements.

11. A wireless local area network (LAN) antenna comprising:

a first antenna element having a first shape; and

a second antenna element coupled to said wireless LAN transceiver having a second shape different from the first shape;

at least one of said first and second antenna elements comprising a feed branch and a loop branch, the loop branch having a first end coupled to said feed branch, a second end adjacent said feed branch and separated therefrom by a gap, and a loop-back section extending between the first and second ends;

said feed branch comprising first and second feed points, the first end of said loop branch being coupled to the first feed point, and the second end of said loop branch being adjacent the second feed point.

12. The wireless LAN antenna of claim 11 wherein said first and second antenna elements have different gain patterns, and wherein the different gain patterns have a substantially equal main lobe gain.

13. The wireless LAN antenna of claim 11 wherein said loop-back section of said loop branch comprises at least one arcuate portion.

14. A wireless local area network (LAN) communications method comprising:

providing a wireless LAN antenna comprising a first antenna element having a first shape, and a second antenna element having a second shape different from the first shape;

at least one of the first and second antenna elements comprising a feed branch and a loop branch, the loop branch having a first end coupled to the feed branch, a second end adjacent the feed branch and separated therefrom by a gap, and a loop-back section extending between the first and second ends;

the feed branch comprising first and second feed points, the first end of the loop branch being coupled to the first feed point, and the second end of the loop branch being adjacent the second feed point; and

communicating signals over a wireless LAN via the first and second antenna elements.

15. The method of claim 14 wherein the first and second antenna elements have different gain patterns, and wherein the different gain patterns have a substantially equal main lobe gain.

16. The method of claim 14 wherein the loop-back section of the loop branch comprises at least one arcuate portion.