HOOKED STUB COLLINEAR ARRAY ANTENNA

• US 20060139229A1
• Filed: 12/28/2004
• Published: 06/29/2006
• Est. Priority Date: 12/28/2004
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Mass, James, Saliga, Stephen, Theobold, David
• Granted Patent: US 7,098,861 B2
• Time in Patent Office: Days
• US Class Current: 343/801
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 21/10 Collinear arrangements of substantially straight elongated conductive units
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A hooked stub collinear array antenna formed from a single conductor. The antenna operates at a design frequency having an associated wavelength. The antenna includes a plurality of radiating elements that are substantially one half the wavelength. The radiating elements are aligned with a longitudinal axis of the antenna. The antenna further includes a delay element connected between each of the plurality of radiating elements. The delay element is aligned with a transverse axis approximately ninety degrees from the longitudinal axis. The delay element extends approximately one quarter of the wavelength from the longitudinal axis and adjacent delay elements of a plurality of delay elements are sequentially rotated at 90 degree intervals relative to each other about the longitudinal axis. The total length of the delay element is approximately one half the wavelength.

Claims

1. A hooked stub collinear array antenna formed from a single conductor and configured to operate at a design frequency having a wavelength, comprising:

a plurality of radiating elements that are substantially one half the wavelength aligned with a longitudinal axis;

a delay element connected between each of the plurality of radiating elements, wherein there are at least two delay elements;

wherein the delay element is aligned with a corresponding transverse axis approximately ninety degrees from the longitudinal axis, the delay element extending approximately one quarter of the wavelength from the longitudinal axis, the total length of the delay element is approximately one half the wavelength;

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wherein the corresponding transverse axis of a delay elements is serially rotated by ninety degrees from the corresponding transverse axis of a next delay element.

2. The hooked stub collinear array antenna of claim 1, wherein there are at least four radiating elements.

3. The hooked stub collinear array antenna of claim 1, wherein the plurality of radiating elements is a multiple of four.

4. The hooked stub collinear array antenna of claim 1, wherein the proximal end of the delay elements extend along a transverse axis and are serially rotated ninety degrees in a clockwise direction.

5. The hooked stub collinear array antenna of claim 1, wherein the proximal end of the delay elements are serially rotated ninety degrees in a counterclockwise direction.

6. The hooked stub collinear array antenna of claim 1, wherein the wherein the delay elements are substantially U shaped.

7. The hooked stub collinear array antenna of claim 6, the delay elements further comprising a substantially ninety degree bend about an axis parallel to the longitudinal axis of the antenna.

8. The hooked stub collinear array antenna of claim 1, wherein the delay elements are substantially rectangular in shape.

9. The hooked stub collinear array antenna of claim 1, wherein the delay elements are substantially J shaped.

10. The hooked stub collinear array antenna of claim 1, wherein the delay elements are substantially similar.

11. The hooked stub collinear array antenna of claim 10, wherein the delay elements am symmetric about the longitudinal axis and substantially perpendicular to the longitudinal axis.

12. The hooked stub collinear array antenna of claim 11, wherein the delay elements are rotated in one of a clockwise and counterclockwise direction along the longitudinal axis.

13. The hooked stub collinear array antenna of claim 1, wherein the height of the delay elements along the longitudinal axis is less than 1/20 the wavelength.

14. A hooked stub collinear array antenna formed from a single conductor and configured to operate at a design frequency having a wavelength, comprising:

a plurality of radiating elements that are substantially one half the wavelength in length and aligned with a vertical axis, comprising first, second and third radiating elements;

a first delay element between the first and second radiating elements;

wherein the first delay element is aligned with a first horizontal axis approximately ninety degrees from the vertical axis extending approximately one quarter of the wavelength, the total length of the delay element is approximately one half the wavelength, and

a second delay element between the second and third radiating elements;

wherein the second delay element is aligned with a second horizontal axis approximately ninety degrees from the vertical axis extending approximately one quarter of the wavelength, the total length of the delay element is approximately one half the wavelength and the first and second horizontal axis are rotated by ninety degrees about the vertical axis.

16. The hooked stub collinear array antenna of claim 14, wherein the plurality of radiating elements is a multiple of four.

17. The hooked stub collinear array antenna of claim 14, wherein the proximal end of the delay elements extend along a transverse axis and are serially rotated ninety degrees in one of a clockwise direction and a counterclockwise direction.

18. The hooked stub collinear array antenna of claim 14, wherein the wherein the delay elements arm one of substantially U shaped, substantially rectangular in shape, and substantially J shaped.

19. The hooked stub collinear array antenna of claim 14, the delay elements further comprising a substantially ninety degree bend about an axis parallel to the longitudinal axis of the antenna.

20. The hooked stub collinear array antenna of claim 14, wherein the delay elements are substantially similar.

21. The hooked stub collinear array antenna of claim 14, wherein the delay elements are symmetric about the vertical axis and substantially perpendicular to the vertical axis.

22. The hooked stub collinear array antenna of claim 14, wherein the height of the delay elements along the vertical axis is less than 1/20 the wavelength.

23. The hooked stub collinear array antenna of claim 14, further comprising:

the plurality of radiating elements further comprises a fourth radiating element; and

a third delay element between the third and fourth radiating elements;

wherein the third delay element is aligned with a third horizontal axis approximately ninety degrees from the vertical axis extending approximately one quarter of the wavelength, the total length of the delay element is approximately one half the wavelength and the second and third horizontal axis are rotated by ninety degrees about the vertical axis.

24. The hooked stub collinear array antenna of claim 23, further comprising:

the plurality of radiating elements further comprises a fifth radiating element; and

a fourth delay element between the fourth and fifth radiating elements;

wherein the fourth delay element is aligned with a fourth horizontal axis approximately ninety degrees from the vertical axis extending approximately one quarter of the wavelength, the total length of the delay element is approximately one half the wavelength and the fourth and fifth horizontal axis are rotated by ninety degrees about the vertical axis.

25. The hooked stub collinear array antenna of claim 23, wherein the second horizontal axis is rotated 90 degrees from the first horizontal axis in a clockwise direction and the third horizontal axis is rotated 90 degrees from the second horizontal axis in a clockwise direction.

26. The hooked stub collinear array antenna of claim 23, wherein the second horizontal axis is rotated 90 degrees from the first horizontal axis in a counterclockwise direction and the third horizontal axis is rotated 90 degrees from the second horizontal axis in a counterclockwise direction.

15. (canceled)