Broadband conformal antenna

Patent metadata

Field	Value
Publication number	US-10971806-B2
Application number	US-201715683718-A
Country	US
Kind code	B2
Filing date	Aug 22, 2017
Priority date	Aug 22, 2017
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A broadband conformal antenna (“BCA”) is disclosed. The BCA includes a narrow approximately rectangular outer conductive (“NARO”) housing, a plurality of dielectric layers within the NARO housing forming a laminated dielectric structure, and an inner conductor formed within the laminated dielectric structure. The NARO housing includes a top broad wall and the BCA further includes an antenna slot within the top broad wall. The BCA is configured to support a transverse electromagnetic signal within the NARO housing.

First claim

What is claimed is:

1. A broadband conformal antenna (“BCA”) comprising:
a narrow approximately rectangular outer conductive (“NARO”) housing, wherein the NARO housing includes a top broad wall and a bottom broad wall, each of the top broad wall and the bottom broad wall having a length, the top broad wall connected to the bottom broad wall by a pair of narrow walls, each narrow wall having a narrow wall height, and the NARO housing including a first end located the length away from a second end, wherein the top broad wall is constructed of copper, has a thickness approximately equal to 0.7 mils, a width approximately equal to 82.8 mils, and a length approximately equal to 1181 mils;
a plurality of dielectric layers within the NARO housing forming a laminated dielectric structure, wherein each dielectric layer of the plurality of dielectric layers has a thickness approximately equal to 10 mils;
an inner stripline conductor formed within the laminated dielectric structure, the inner stripline conductor extending the length from the first end to the second end; and
an antenna slot within the top broad wall, wherein the NARO housing supports a transverse electromagnetic signal during use, and wherein the antenna slot is angled and centered along the top broad wall.

2. The BCA of claim 1 , further comprising a broadband load coupled to the inner stripline conductor and the NARO housing.

3. The BCA of claim 2 , wherein the BCA has a characteristic impedance and wherein the broadband load has an impedance that is substantially the characteristic impedance of the BCA.

4. The BCA of claim 3 , wherein the impedance of the broadband load is approximately 50 ohms.

5. The BCA of claim 1 , wherein the bottom broad wall is contoured to conform to a curved surface of an object.

6. The BCA of claim 5 , further comprising one or more fasteners configured to couple the bottom broad wall to the curved surface.

7. The BCA of claim 6 , wherein the one or more fasteners comprise an adhesive.

8. The BCA of claim 6 , wherein the one or more fasteners comprises a first strip coupled to the bottom broad wall, a second strip coupled to the curved surface, wherein the first strip comprises a plurality of hooks configured to couple to a plurality of loops of the second strip or wherein the first strip comprises a plurality of loops configured to couple to a plurality of hooks of the second strip.

9. The BCA of claim 1 , further comprising one or more fasteners configured to couple the bottom broad wall to a flat surface of an object.

10. The BCA of claim 9 , wherein the one or more fasteners comprise magnets.

11. The BCA of claim 9 , wherein the one or more fasteners comprise screws or rivets.

12. The BCA of claim 1 , wherein the top broad wall has a broad wall width, and wherein the broad wall width is approximately twice the narrow wall height.

13. The BCA of claim 12 , wherein the inner stripline conductor is located at a first position within the NARO housing that is approximately at a first center position that is equal to half of the narrow wall height and wherein the inner stripline conductor has an inner conductor center that is located at a second position within the NARO housing that is approximately at a second center position that is equal to half of the broad wall width.

14. The BCA of claim 1 , wherein the inner stripline conductor is coupled to a ground.

15. The BCA of claim 14 , wherein a first narrow wall of the pair of narrow walls is formed by a first plurality of vias from the top broad wall to the bottom broad wall, and wherein a second narrow wall of the pair of narrow walls is formed by a second plurality of vias from the top broad wall and the bottom broad wall.

16. The BCA of claim 15 , wherein the first plurality of vias electrically connect the top broad wall to the bottom broad wall, and wherein the second plurality of vias electrically connect the top broad wall to the bottom broad wall.

17. The BCA of claim 16 , wherein the first plurality of vias and the second plurality of vias are filled with conductive epoxy.

18. The BCA of claim 1 , further including a second antenna slot within the top broad wall.

19. The BCA of claim 1 , further including a power divider in signal communication with an input port of the NARO housing.

20. A method for fabricating a broadband conformal antenna (“BCA”) utilizing a lamination process, the method comprising:
patterning a first metal on a first dielectric layer, the first dielectric layer having a top surface, a bottom surface, and a dielectric layer thickness of approximately 10 mils, wherein the first metal is patterned on the bottom surface of the first dielectric layer to produce a bottom broad wall having a length of approximately 1181 mils;
patterning a second metal on a second dielectric layer, the second dielectric layer having a top surface, a bottom surface, and the dielectric layer thickness, wherein the second metal is patterned on a portion of the top surface of the second dielectric layer, and wherein the second metal is patterned on the second dielectric layer to produce an inner stripline conductor;
laminating the bottom surface of the second dielectric layer on the top surface of the first dielectric layer;
laminating a third dielectric layer, the third dielectric layer having a top surface, a bottom surface, and the dielectric layer thickness, on the second dielectric layer, wherein the bottom surface of the third dielectric layer is laminated on to the top surface of the second dielectric layer;
patterning copper on a fourth dielectric layer, the fourth dielectric layer having a top surface, a bottom surface, and the dielectric layer thickness, wherein the copper has a thickness of approximately 0.7 mils, a width of approximately 82.8 mils, and is patterned on the top surface of the fourth dielectric layer to produce a top broad wall having the length, wherein the copper of the top broad wall is patterned to include an antenna slot along the top broad wall that exposes the top surface of the fourth dielectric layer through the copper of the top broad wall, and wherein the antenna slot is angled and centered along the top broad wall;
laminating the bottom surface of the fourth dielectric layer on the top surface of the third dielectric layer to produce a composite laminated structure; and
electrically shorting the first metal to the copper by a pair of narrow walls, each narrow wall having a narrow wall height, wherein the first metal, the pair of narrow walls, and the copper comprise portions of a narrow approximately rectangular outer conductive (“NARO”) housing having a first end located the length away from a second end, wherein the inner stripline conductor extends the length from the first end to the second end, and wherein the NARO housing supports a transverse electromagnetic signal during use.

21. The method of claim 20 , wherein one or more of the first metal, the second metal, and the copper are formed by a subtractive method of pre-deposited electroplated or rolled metals, wherein the subtractive method includes wet etching or laser ablation.

22. The method of claim 20 , wherein one or more of the first metal, the second metal, and the copper are formed by an additive method that includes printing or deposition.

23. The method of claim 20 , wherein the electrically shorting the first metal to the copper comprises:
producing a first plurality of vias through a first side of the composite lamina

Assignees

• Boeing Co

Inventors

• Rogers John E
• Savage Larry Leon
• Williams John Dalton
• Dabrowski Ted Ronald

Classifications

• H01Q13/22

  Longitudinal slot in boundary wall of waveguide or transmission line {(H01Q13/203 takes precedence)} · CPC title

• H01Q21/005

  Slotted waveguides arrays · CPC title

• H01Q1/286 Primary

  substantially flush mounted with the skin of the craft · CPC title

• H01Q13/085

  Slot-line radiating ends · CPC title

• H01Q9/28

  Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines (waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00) · CPC title