Horizontally polarized slot antenna with omni-directional and sectorial radiation patterns

• US 20030184485A1
• Filed: 11/21/2002
• Published: 10/02/2003
• Est. Priority Date: 11/21/2001
• Status: Active Grant

• Current Assignee: Superpass Company Inc.
• Original Assignee: Superpass Company Inc.
• Inventors: Jiang, Guozhong, Zhu, Luke, Chen, Xifan
• Granted Patent: US 6,879,296 B2
• Time in Patent Office: Days
• US Class Current: 343/767
• CPC Class Codes: H01Q 13/106 Microstrip slot antennas patch antenna elements H01Q9/0407
• CPC Class Codes: H01Q 13/12 Longitudinally slotted cylinder antennas; Equivalent structures
• CPC Class Codes: H01Q 19/021 Means for reducing undesirable effects
• CPC Class Codes: H01Q 19/10 using reflecting surfaces
• CPC Class Codes: H01Q 19/108 Combination of a dipole with a plane reflecting surface H01Q19/106 takes precedence; strip line H01Q9/065
• CPC Class Codes: H01Q 21/0075 Stripline fed arrays H01Q21/065 takes precedence
• CPC Class Codes: H01Q 21/064 using horn or slot aerials slotted waveguides arrays H01Q21/005
• CPC Class Codes: H01Q 21/08 the units being spaced along or adjacent to a rectilinear path waveguide fed H01Q21/0037

Abstract

A slot antenna comprising: a first and second boards each having an edge attached to respective opposite edges of a center board to form an essentially C-shaped open-ended channel having an inner surface and an outer surface; the center board having a slot for radiating signals defined in an electrically conductive layer bonded to an outer surface thereof and an electrically conductive feed line bonded to an inner surface thereof; the slot having a drive point being a portion of the feed line undercrossing the slot between opposite edges of the slot; the first and second boards each having an electrically conductive layer bonded to an outer surface thereof to reduce nulls, thereby providing an essentially omni-directional radiation pattern for the slot; and, a connector for coupling the signals to the antenna.

Claims

1. A slot antenna comprising:

a first and second boards each having an edge attached to respective opposite edges of a center board to form an essentially C-shaped open-ended channel having an inner surface and an outer surface;

said center board having a slot for radiating signals defined in an electrically conductive layer bonded to an outer surface thereof and an electrically conductive feed line bonded to an inner surface thereof;

said slot having a drive point being a portion of said feed line undercrossing said slot between opposite edges of said slot;

said first and second boards each having an electrically conductive layer bonded to an outer surface thereof to reduce nulls, thereby providing an essentially omni-directional radiation pattern for said slot; and

,

a connector for coupling said signals to said antenna.

2. The slot antenna of claim 1 wherein said first, second, and center boards are printed circuit boards (PCBs).

3. The slot antenna of claim 2 wherein said first and second boards are composed of one-ounce FR-4 material.

4. The slot antenna of claim 3 wherein said center board is a FR-35 PCB board.

5. The slot antenna of claim 4 wherein said slot and said first, second, and center boards have respective rectangular shapes.

6. The slot antenna of claim 5 wherein said opposite edges of said slot and said center board are long edges of said respective rectangular shapes.

7. The slot antenna of claim 6 wherein said slot is centered within said center board.

8. The slot antenna of claim 7 wherein said opposite edges of said slot are essentially parallel to said opposite edges of said center board.

9. The slot antenna of claim 8 wherein said center board forms an essentially right angle with each of said first and second boards.

10. The slot antenna of claim 9 wherein said slot has a length L≅

88 mm, a width W≅

3.6 mm, a wavelength λ

≅

123 mm, and a frequency f≅

2.4 GHz, wherein L≅

0.715λ

and W≅

0.028λ

.

11. The slot antenna of claim 10 wherein said first, second, and center boards have lengths L1, L2, and L3, and widths of W1, W2, and W3, respectively, and wherein L1=L2=L3≅

140.8 mm, W1≅

23.4 mm, and W2=W3≅

24 mm.

12. The slot antenna of claim 1 wherein said connector includes first and second conductors connected to said feed line and said conductive layer of said center board, respectively.

13. The slot antenna of claim 12 wherein said connector is a coaxial connector.

14. The slot antenna of claim 13 wherein said connector has an input impedance of approximately 50 ohms.

15. The slot antenna of claim 1 wherein said slot and said feed line are formed by etching.

16. The slot antenna of claim 1 wherein said channel is oriented vertically to provide a horizontally polarized radiation pattern.

17. The slot antenna of claim 1 wherein said channel is oriented horizontally to provide a vertically polarized radiation pattern.

18. The slot antenna of claim 1 for receiving said signals.

19. The slot antenna of claim 1 and further comprising:

a reflector having a first and second panels each having an edge attached to respective opposite edges of a center panel to form an essentially C-shaped open-ended channel having an inner surface and an outer surface;

said center panel having an outer surface spaced from and parallel to said inner surface of said center board to sectorialize said radiation pattern of said slot.

20. The slot antenna of claim 19 wherein said first, second, and center panels of said reflector have respective rectangular shapes.

21. The slot antenna of claim 20 wherein said opposite edges of said center panel are long edges of said center panel.

22. The slot antenna of claim 21 wherein said long edges of said center panel are parallel to said long edges of said center board.

23. The slot antenna of claim 22 wherein said center board is centered over said center panel.

24. The slot antenna of claim 23 wherein said reflector is formed from a sheet of metal by bending.

25. The slot antenna of claim 24 wherein said center panel forms an angle of approximately 135 degrees with each of said first and second panels.

26. The slot antenna of claim 25 wherein said first, second, and center panels have lengths L4, L5, and L6, and widths of W4, W5, and W6, respectively, and wherein L4=L5=L6≧

140.8 mm and W4=W5=W6≅

70 mm.

27. The slot antenna of claim 26 wherein said center panel is spaced a distance S from said inner surface of said center board and wherein S≅

W2+32 mm=56 mm.

28. The slot antenna of claim 27 wherein said radiation pattern is sectorialized by approximately 180 degrees.

29. The slot antenna of claim 1 and further comprising:

a first and second reflector panels each spaced successively from and parallel to said inner surface of said center board to sectorialize said radiation pattern of said slot.

30. The slot antenna of claim 29 wherein said first and second reflector panels have respective rectangular shapes.

31. The slot antenna of claim 30 wherein respective long edges of said first and second reflector panels are parallel to said long edges of said center board.

32. The slot antenna of claim 31 wherein said center board is centered over said first reflector panel and said first reflector panel is centered over said second reflector panel.

33. The slot antenna of claim 32 wherein said first and second reflector panels are metal panels.

34. The slot antenna of claim 33 wherein said first and second reflector panels have lengths L7 and L8, and widths W7 and W8, respectively, and wherein L8≧

L7≧

140.8 mm, approximately, W7≅

51 mm, and W8≅

106 mm.

35. The slot antenna of claim 34 wherein said first reflector panel is spaced a distance S1 from said inner surface of said center board and wherein S1≅

W2+12.7 mm=44.7 mm.

36. The slot antenna of claim 35 wherein said second reflector panel is spaced a distance S2 from said first reflector panel and wherein S2≅

19.1 mm.

37. The slot antenna of claim 36 wherein said radiation pattern is sectorialized by approximately 120 degrees.