Granted Patent B2

US 12,355,153 · App. 18/343,504 · Granted Jul 8, 2025

Inventor: Jia-Chi Samuel Chieh (San Diego, CA)

Assignee: United States of America as represented by the Secretary of the Navy

H01Q15/0026H01Q3/005H01Q19/06

Abstract

Claims (26)

1. A monopulse tracking antenna, comprising:

a triple-mode circular waveguide horn, configured to generate three monopulse patterns;

at least two Risley prisms, each positioned a fixed distance from the triple-mode circular waveguide horn, configured to receive and steer the three monopulse patterns, wherein each Risley prism is coated with an anti-reflective layer;

a means for axially rotating each of the at least two Risley prisms; and

a parabolic phase correcting surface, positioned intermediately between the triple-mode circular waveguide horn and at least two Risley prisms.

2. The monopulse tracking antenna of claim 1 , further comprising three Risley prisms.

3. The monopulse tracking antenna of claim 1 , further comprising a 3D printed support structure Risley prisms.

4. The monopulse tracking antenna of claim 1 , wherein the three independent modes are TE 11 , TM 01 , and TE 21 .

5. The monopulse tracking antenna of claim 1 , wherein the dielectric wedges comprise Titanates with a dielectric constant of 13.2.

6. The monopulse tracking antenna of claim 1 , wherein the anti-reflective layer has a dielectric constant of 3.55.

7. The monopulse tracking antenna of claim 1 , wherein the height of the anti-reflective layer is about 0.762 mm.

8. The monopulse tracking antenna of claim 1 , wherein the dimensions, without the anti-reflective layer, comprise an initial height of 1.35 mm, length of 52.5 mm, and final height of 8.65 mm.

9. The monopulse tracking antenna of claim 1 , wherein the parabolic phase correcting surface has a focal length of 20 mm and a diameter of 40 mm and wherein the PPCS is placed 30 mm from the triple-mode circular waveguide horn.

10. A monopulse tracking antenna system, comprising:

a triple-mode circular waveguide horn, configured to generate three monopulse patterns;

at least two Risley prisms, each positioned a fixed distance from the triple-mode circular waveguide horn, configured to receive and steer the three monopulse patterns, wherein each Risley prism is coated with an anti-reflective layer;

a means for axially rotating each of the at least two Risley prisms; and

a parabolic phase correcting surface, positioned intermediately between the triple-mode circular waveguide horn and at least two Risley prisms.

11. The monopulse tracking antenna system of claim 9 , further comprising three Risley prisms.

12. The monopulse tracking antenna system of claim 9 , further comprising a 3D printed support structure Risley prisms.

13. The monopulse tracking antenna system of claim 9 , wherein the three independent modes are TE 11 , TM 01 , and TE 21 .

14. The monopulse tracking antenna system of claim 9 , wherein the dielectric wedges comprise Titanates with a dielectric constant of 13.2.

15. The monopulse tracking antenna system of claim 9 , wherein the anti-reflective layer has a dielectric constant of 3.55.

16. The monopulse tracking antenna of claim 9 , wherein the height of the anti-reflective layer is about 0.762 mm.

17. The monopulse tracking antenna system of claim 9 , wherein the dimensions, without the anti-reflective layer, comprise an initial height of 1.35 mm, length of 52.5 mm, and final height of 8.65 mm.

18. The monopulse tracking antenna system of claim 9 , wherein the parabolic phase correcting surface has a focal length of 20 mm and a diameter of 40 mm and wherein the PPCS is placed 30 mm from the triple-mode circular waveguide horn.

Assignments (1)

Continuity (1)

References Cited (11)