Structural endcap antenna

• US 6,175,336 B1
• Filed: 12/27/1999
• Issued: 01/16/2001
• Est. Priority Date: 12/27/1999
• Status: Expired due to Fees

• Current Assignee: Northrop Grumman Corporation
• Original Assignee: Northrop Grumman Corporation
• Inventors: Durham, Michael David, Kudva, Jayanth Nandalke, Lacombe, Peter, Coughlin, Daniel Patrick, Alt, Kevin Herman, Olsen, Keith Alan, Lockyer, Allen John
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): NGUYEN, HOANG V
• Application Number:
  US09/472,497
• Time in Patent Office: 386 Days
• Field of Search: H01/Q.128, 343/705, 343/708, 343/872, 343/878
• US Class Current: 343/708
• CPC Class Codes: H01Q 1/28 Adaptation for use in or on aircraft, missiles, satellites, or balloons
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142

Abstract

A structural endcap antenna for a vertical tail of an aircraft. The endcap antenna comprises an outer skin having an inner surface and an antenna element disposed adjacent to the inner surface of the outer skin. The antenna element is in electrical communication with an RF signal source. Disposed adjacent to the antenna element is an inner support structure electrically bonded thereto. The antenna element and the inner support structure are excited by the RF signal source and provide structural support to the endcap antenna.

Claims

1. A structural endcap antenna for a vertical tail an aircraft, the endcap antenna comprising:

an outer skin having an inner surface;

an antenna element disposed adjacent to the inner surface of the outer skin, the antenna element being in electrical communication with an RF signal source; and

an inner support structure disposed adjacent to the antenna element, the inner support structure bonded to the antenna element such that the outer skin, the antenna element and the inner support structure are excited by the RF signal source and provide structural support to the endcap antenna.

2. The endcap antenna of claim 1 wherein the antenna element is graphite.

3. The endcap antenna of claim 1 wherein the antenna element is copper mesh.

4. The endcap antenna of claim 3 wherein the inner support structure is a honeycomb structure.

5. The endcap antenna of claim 4 wherein the honeycomb structure is an aluminum honeycomb structure.

6. The endcap antenna of claim 4 wherein the inner support structure comprises a conductive portion and a non-conductive portion.

7. The endcap antenna of claim 6 wherein the conductive portion of the inner support structure is disposed adjacent to the antenna element.

8. The endcap antenna of claim 6 wherein the conductive portion is aluminum honeycomb and the non-conductive portion is glass honeycomb structure.

9. The endcap antenna of claim 1 wherein the outer skin comprises multiple plies of fiberglass.

10. The endcap antenna of claim 1 wherein the outer skin, the antenna element, and the inner support structure are bonded together through the use of an adhesive.

11. The endcap antenna of claim 1 wherein the endcap antenna has a bottom end and further comprises an end rib disposed adjacent to the bottom end thereof.

12. The endcap antenna of claim 11 wherein the end rib is configured as a ground plane for the antenna element.

13. The endcap antenna of claim 12 wherein the end rib is fabricated from graphite.

14. The endcap antenna of claim 13 wherein the end rib is fabricated from fiberglass with an electrically conductive finish.

15. The endcap antenna of claim 1 wherein the antenna element wraps around the inner support structure.

16. A structural endcap antenna for a vertical tail of an aircraft, the endcap antenna comprising:

a first half having;

a first outer skin having an inner surface;

a first electrically conductive antenna element disposed adjacent to the inner surface of the first outer skin, the first antenna element being in electrical communication with an RF signal source; and

a first inner support structure disposed adjacent to the first antenna element; and

a second half having;

a second outer skin having an inner surface;

a second electrically conductive antenna element disposed adjacent to the inner surface of the second outer skin, the second antenna element being in electrical communication with the RF signal source; and

a second inner support structure disposed adjacent to the antenna element;

wherein the first inner support structure and the second inner support structure are bonded together to form the structural endcap antenna.

17. The endcap antenna of claim 16 wherein the first and second outer skins, the first and second antenna elements, and the first and second inner support structures are configured to be structural elements of the endcap when bonded together.

18. The endcap antenna of claim 17 wherein the first and second antenna elements are copper mesh.

19. The endcap antenna of claim 18 wherein the first and second inner support structures are a honeycomb structure.

20. The endcap antenna of claim 19 further comprising a bond between the first half and the second half of the endcap antenna that permits electrical conductivity between the first half and the second half.

21. The endcap antenna of claim 17 wherein the first and second antenna elements are graphite.

22. The endcap antenna of claim 16 wherein:

the first inner support structure comprises a conductive portion and a non-conductive portion; and

the second inner support structure comprises a conductive portion and a non-conductive portion.

23. The endcap antenna of claim 22 wherein the conductive portion of the first inner support structure is disposed adjacent to the first antenna element and the conductive portion of the second inner support structure is disposed adjacent to the second antenna element.

24. The endcap antenna of claim 23 wherein the conductive portion of the first and second inner support structures is an aluminum honeycomb structure and the non-conductive portion of the first and second inner support structures is a glass honeycomb structure.

25. The endcap antenna of claim 16 wherein the endcap antenna has a bottom end when the first and second halves are bonded together and the endcap antenna further comprise an end rib disposed adjacent to the bottom end thereof.

26. The endcap antenna of claim 25 wherein the end rib is configured to be a ground plane for the first and second antenna elements.

27. The endcap antenna of claim 26 wherein the end rib is fabricated from graphite.

28. The endcap antenna of claim 27 wherein the end rib is fabricated from fiberglass having an electrically conductive finish.

29. A structural endcap antenna for a vertical tail of an aircraft, the endcap antenna comprising:

a center fiberglass section having a first surface and a second surface;

a first antenna element and a second antenna element, each of the first and second antenna elements disposed in laminar juxtaposition with a respective first and second surface of the center fiberglass section;

a first support structure and a second support structure, each of the first and second support structures disposed in laminar juxtaposition with a respective one of the first and second antenna elements; and

a first and second outer skin, each of the first and second outer skins disposed in laminar juxtaposition with a respective one of the first and second support structures;

wherein the first and second outer skins, the first and second support structures, the first and second antenna elements, and the center fiberglass section form the structural endcap antenna for the vertical tail of the aircraft.

30. The endcap antenna of claim 29 wherein:

the first and second antenna elements are copper mesh;

the first and second support structures are a honeycomb support structure; and

the first and second outer skins are fiberglass outer skins.

31. The endcap antenna of claim 30 wherein the first and second copper mesh, the first and second support structure and the first and second outer skin are bonded together with an adhesive.

32. The endcap antenna of claim 29 wherein the first and second support structures each comprise a conductive portion and a non-conductive portion.

33. The endcap antenna of claim 32 wherein the conductive portion is aluminum honeycomb and the non-conductive portion is glass honeycomb.

34. The endcap antenna of claim 29 wherein the first and second antenna elements are graphite.

35. A method of forming a structural endcap antenna for a vertical tail of an aircraft, the method comprising the steps of:

forming a first outer skin having an interior surface;

bonding a first antenna element to the inner surface of the first outer skin;

bonding a first support structure to the first antenna element;

bonding a second support structure to the first support structure;

bonding a second antenna element to the second support structure; and

bonding a second outer skin to the second antenna element;

wherein the first and second outer skins, the first and second antenna elements and the first and second support structure form the structural endcap antenna.

36. The method of claim 35 further comprising the step of bonding a fiberglass section between the first and second support structures.

37. The method of claim 35 wherein the first an second antenna elements are bonded between the first and second support structures.