Multiband branch radiator antenna element

• US 6,975,278 B2
• Filed: 02/28/2003
• Issued: 12/13/2005
• Est. Priority Date: 02/28/2003
• Status: Active Grant

• Current Assignee: Hong Kong Applied Science And Technology Research Institute Co., Ltd.
• Original Assignee: Hong Kong Applied Science And Technology Research Institute Co., Ltd.
• Inventors: Murch, Ross David, Song, Peter Chun Teck
• Primary Examiner(s): Wimer, Michael C.
• Application Number:
  US10/377,129
• Publication Number:
  US 20040169612A1
• Time in Patent Office: 1,019 Days
• Field of Search: 343/702, 343/792.5, 343/795, 343802-804, 343833-836, 343/810, 343/812, 343/815, 343/817, 343/837, 343/852, 343/819, 343/857
• US Class Current: 343/795
• CPC Class Codes: H01Q 19/106 using two or more intersecting plane surfaces, e.g. corner reflector antennas
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 5/48 Combinations of two or more dipole type antennas
• CPC Class Codes: H01Q 9/26 with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength resonant loop antennas H01Q7/00

Abstract

Disclosed are systems and methods which provide multi-band antenna elements using multiple radiating branches interconnected with a feed plate, thereby providing a multi-band antenna element having a single feed. Additionally or alternatively, a wide band antenna configuration is provided utilizing multiple radiating branches of a multi-band antenna element of the present invention. Embodiments utilize one or more reflectors, such as to provide directivity and/or radiation pattern shaping, including utilizing one or more radiating branches of a multi-band antenna element as a reflector for another one or more radiating branches of the multi-band antenna.

Claims

1. An antenna element comprising:

a first radiating branch associated with a first resonant frequency band;

a second radiating branch associated with a second resonant frequency band;

a signal feed plate coupling said first radiating branch and said second radiating branch thereby providing a single signal feed with respect to said first and second radiating branches;

a reflector oriented such that said first radiating branch is disposed between said second radiating branch and said reflector, wherein said reflector comprises a folded surface having an axis of fold parallel to said first and second radiating branches.

2. The antenna element of claim 1, wherein an angle of said folded surface is approximately 45°

.

3. An antenna element comprising:

a first radiating branch associated with a first resonant frequency band;

a second radiating branch associated with a second resonant frequency band;

a signal feed plate coupling said first radiating branch and said second radiating branch thereby providing a single signal feed with respect to said first and second radiating branches;

a reflector oriented such that said first radiating branch is disposed between said second radiating branch and said reflector, wherein a spacing S₁ of said first radiating branch from said reflector is in the range of approximately 0.25λ

₁ and 0.7 λ

₁, wherein λ

₁ is a characteristic wavelength of said first resonant frequency band, and a spacing S₂ of said second radiating branch from said reflector is in the range of approximately 0.25λ

₂ and 0.7 λ

₂ wherein λ

₂ is a characteristic wavelength of said second resonant frequency band, wherein spacing S₁ is determined as a function of S₂ according to the equation;

$S_1=x<br><br>\left\{\frac{{\mathrm{\lambda <br><br>}}_2}{2}-\left(S_2+\frac{{\mathrm{\lambda <br><br>}}_1}{2}\right)\right\}+\frac{{\mathrm{\lambda <br><br>}}_1}{2}.$

4. An antenna element comprising:

a first radiating branch associated with a first resonant frequency band;

a second radiating branch associated with a second resonant frequency band;

a signal feed plate coupling said first radiating branch and said second radiating branch thereby providing a single signal feed with respect to said first and second radiating branches;

a reflector oriented such that said first radiating branch is disposed between said second radiating branch and said reflector;

a third radiating branch associated with a third resonant frequency band, wherein said first and second radiating branches are disposed between said third radiating branch and said reflector; and

a signal transmission line coupled to said third radiating branch electrically isolated from said signal feed plate.

5. The antenna element of claim 4, wherein said third resonant frequency is greater than said first resonant frequency and less than said second resonant frequency.

6. The antenna element of claim 4, wherein said third resonant frequency is less than said first and second resonant frequencies.

8. The antenna element of claim 4, further comprising:

a signal feed plate coupling said third radiating branch to said second radiating branch.

9. The antenna element of claim 4, wherein said antenna element provides multi-band operation in which a first band of said multi-band operation corresponds to said first resonant frequency band, a second band of said multi-band operation corresponds to said second resonant frequency band, and a third band of said multi-band operation corresponds to said third resonant frequency band.

10. The antenna element of claim 4, wherein said antenna element provides wideband operation in which a first edge of said wideband operation corresponds to one of said first and third resonant frequency bands and a second edge of said wideband operation corresponds to said-second resonant frequency band.

11. The antenna element of claim 4, wherein said antenna element provides wideband operation in which a first edge of said wideband operation corresponds to said first resonant frequency band and a second edge of said wideband operation corresponds to said second resonant frequency band.

7. The antenna element comprising:

a signal transmission line coupling said third radiating branch to said second radiating branch.

12. A method for providing an antenna element comprising:

coupling a first radiating branch associated with a first resonant frequency band to a second radiating branch associated with a second resonant frequency band using a signal feed plate, said signal toed plate providing a single signal feed with respect to said first and second radiating branches; and

providing a reflector surface such that said first radiating branch is disposed between said second radiating branch and said reflector surface;

folding said reflector surface along an axis parallel to said first and second radiating branches to thereby provide a corner reflector configuration.

13. A method for providing an antenna element comprising:

coupling a first radiating branch associated with a first resonant frequency band to a second radiating branch associated with a second resonant frequency band using a signal feed plate, said signal feed plate providing a single signal feed with respect to said first and second radiating branches, wherein said signal feed plate has a relatively large surface area when compared to surface areas of the first and second radiating branches and;

providing a reflector surface such that said first radiating branch is disposed between said second radiating branch and said reflector surface, wherein said first resonant frequency is greater than said second resonant frequency, and wherein said second radiating branch operates as a sub-reflector with respect to said first radiating branch; and

providing a third radiating branch on a side of said second radiating branch opposite said first radiating branch, wherein said third radiating branch is coupled to a signal feed transmission line isolated from said first and second radiating branches.

14. The method of claim 13, wherein said third radiating branch is associated with a third resonant frequency.

15. The method of claim 14, wherein said third resonant frequency is between said first and second resonant frequencies.

16. The method of claim 14, wherein said first resonant frequency is between said second and third resonant frequencies.

17. The method of claim 13, wherein said third radiating branch is associated with said first resonant frequency.

18. The method of claim 13, further comprising:

coupling said second radiating branch and said third radiating branch using a transmission line.

19. The method of claim 13, further comprising:

coupling said second radiating branch and said third radiating branch using another signal feed plate.

20. A method for providing an antenna element comprising:

coupling a first radiating branch associated with a first resonant frequency band to a second radiating branch associated with a second resonant frequency band using a signal feed plate, said signal feed plate providing a single signal feed with respect to said first and second radiating branches, wherein said signal feed plate has a relatively large surface area when compared to surface areas of the first and second radiating branches; and

providing a first director associated with said first radiating branch;

providing a second director associated with said second radiating branch, wherein said first and second radiating branches are disposed between said first and second directors.

21. A dipole antenna system comprising:

a first dipole element associated with a first frequency band;

a second dipole element associated with a second frequency band, wherein said second dipole element is oriented parallel to said first dipole element, and wherein said first frequency band is wider than said second frequency band; and

a reflector providing reflection of both said first frequency band and said second frequency band, wherein said first dipole element is disposed between said second dipole element and said reflector, wherein said first dipole element comprises first and second radiating branches and said second dipole element comprises third and fourth radiating branches, said system further comprising;

a first signal feed plate coupling said first and third radiating branches; and

a second signal feed plate coupling said second and fourth radiating branches, wherein said first and second signal feed plates are triangular.

22. The system of claim 21, wherein said triangular signal feed plates are disposed to provide a tapered bore between said first and third radiating branches on one side of said bore and said second and fourth radiating branches on another side of said bore.

23. The system of claim 22, wherein said tapered bore provides decoupling of signals.

24. The system of claim 22, wherein said tapered bore provides a frequency independent mode of operation.

25. The system of claim 21, wherein said first dipole element, said second dipole element, said first signal feed plate, and said second signal feed plate are disposed upon a dielectric substrate.

26. The system of claim 25, wherein said first and third radiating branches and said first signal feed plate are disposed on a first side of said dielectric substrate, and wherein said second and fourth radiating branches and said second signal feed plate are disposed on a second side of said dielectric substrate.

27. The system of claim 21, further comprising:

a third dipole element associated with a third frequency band, wherein said third dipole element is oriented parallel to said first and second dipole elements, and wherein said first and second dipole elements are disposed between said third dipole element and said reflector.

28. The system of claim 27, wherein said third frequency band is between said first frequency band and said second frequency band.

29. The system of claim 27, wherein said first frequency band is between said second frequency band and said third frequency band.

30. A dipole antenna system comprising:

a first dipole element associated with a first frequency band;

a second dipole element associated with a second frequency band, wherein said second dipole element is oriented parallel to said first dipole element, and wherein said fist frequency band is wider than said second frequency band;

a reflector providing reflection of both said first frequency band and said second frequency band, wherein said first dipole element is disposed between said second dipole element and said reflector, wherein said first dipole element comprises first and second radiating branches and said second dipole element comprises third and fourth radiating branches;

a first signal feed plate coupling said first and third radiating branches;

a second signal feed plate coupling said second and fourth radiating branches; and

a first director element associated with said first frequency band, wherein said first director element is oriented parallel to said first dipole element and is disposed between said first dipole element and said reflector.

31. The system of claim 30, further comprising:

a second director element associated with said second frequency band, wherein said second dipole element is oriented parallel to said second director and is disposed between said second director element and said reflector.