Radar wave camouflage structure and method for fabricating the same

• US 7,511,653 B2
• Filed: 07/20/2007
• Issued: 03/31/2009
• Est. Priority Date: 07/20/2007
• Status: Expired due to Fees

• Current Assignee: Chang Sui Yu, Chun-Ying Kuo
• Original Assignee: Chang-Sui Yu, Chun-Ying Kuo
• Inventors: Chang, Wen-Lie, Yu, Fu-Sheng
• Primary Examiner(s): Sotomayor; John B
• Application Number:
  US11/780,550
• Publication Number:
  US 20090021415A1
• Time in Patent Office: 620 Days
• Field of Search: 342 1- 4, 342/175
• US Class Current: 342/1
• CPC Class Codes: F41H 3/02 Flexible, e.g. fabric covers, e.g. screens, nets characterised by their material or structuremaking thereof, see the relevant classes, e.g. D04
• CPC Class Codes: H01Q 17/004 using non-directional dissipative particles, e.g. ferrite powders H01Q17/005 takes precedence; flake-like H01Q17/002

Abstract

A radar wave camouflage structure is disclosed. The radar wave camouflage structure comprises a substrate; a first layer on the substrate, comprising a first polymer matrix; magnetic nanoparticles dispersed in the first polymer matrix, wherein the magnetic nanoparticles comprise a mixture of Fe₃O₄, Fe₃O₄-4C carbide, Fe₃O₄—Ni composite and Fe₂O₃; a second layer on the first layer, comprising a second polymer matrix; and carbon black dispersed in the second polymer matrix.

Claims

1. A radar wave camouflage structure, comprising:

a substrate;

a first layer on the substrate, comprising;

a first polymer matrix; and

magnetic nanoparticles dispersed in the first polymer matrix, wherein the magnetic nanoparticles comprise a mixture of Fe₃O₄, Fe₃O₄-4C carbide, Fe₃O₄—

Ni composite and Fe₂O₃; and

a second layer on the first layer, comprising;

a second polymer matrix; and

carbon black dispersed in the second polymer matrix.

2. The radar wave camouflage structure as claimed in claim 1, further comprising a third layer on the second layer, comprising:

a third polymer matrix; and

carbon black dispersed in the third polymer matrix.

3. The radar wave camouflage structure as claimed in claim 2, wherein the first, second and third polymer matrix are polyurethane (PU) resin.

4. The radar wave camouflage structure as claimed in claim 2, wherein the third layer further comprises a filler comprising zinc stearate and a matting agent.

5. The radar wave camouflage structure as claimed in claim 2, wherein the third layer further comprises wax and a rubber softening oil.

6. The radar wave camouflage structure as claimed in claim 1, wherein the first layer further comprises Sb₂O₃ and a rubber softening oil.

7. The radar wave camouflage structure as claimed in claim 1, wherein the first layer further comprises a crosslinker comprising polyisocyanate.

8. The radar wave camouflage structure as claimed in claim 1, wherein the second layer further comprises a filler comprising zinc stearate, a matting agent and a rubber softening oil.

9. The radar wave camouflage structure as claimed in claim 1, wherein the magnetic nanoparticles have an average particle size between 1 nm to 9.9 nm.

10. The radar wave camouflage structure as claimed in claim 1, wherein the substrate comprises metal.

11. The radar wave camouflage structure as claimed in claim 10, further comprising:

the first layer of radar wave camouflage materials having a thickness between about 10 and 50 μ

m on the substrate, comprising;

a polyurethane (PU) resin;

magnetic nanoparticles dispersed in the first polymer matrix, wherein the magnetic nanoparticles comprise a mixture of Fe₃O₄, Fe₃O₄-4C carbide, Fe₃O₄—

Ni composite and Fe₂O₃; and

a rubber softening oil.

12. The radar wave camouflage structure as claimed in claim 11, further comprising:

the second layer having a thickness between about 1 and 2 mm on the first layer, comprising;

carbon black dispersed in the second polymer matrix;

a filler comprising zinc stearate;

a matting agent; and

a rubber softening oil.

13. The radar wave camouflage structure as claimed in claim 12, further comprising:

the third layer having a thickness between about 0.1 and 1 mm on the second layer, comprising;

a polyurethane (PU) resin;

carbon black dispersed in the third polymer matrix;

a filler comprising zinc stearate;

a matting agent;

an anti-oxidant;

wax; and

a rubber softening oil, wherein an absorbance of the radar wave camouflage structure is greater than 10 dB in a 8˜

12 GHz frequency band.

14. The radar wave camouflage structure as claimed in claim 1, wherein the substrate comprises cloth.

15. The radar wave camouflage structure as claimed in claim 14, further comprising:

the first layer of radar wave camouflage materials having a thickness between about 10 and 50 μ

m on the substrate, comprising;

a polyurethane (PU) resin;

magnetic nanoparticles dispersed in the polyurethane (PU) resin, wherein the magnetic nanoparticles comprise a mixture of Fe₃O₄, Fe₃O₄-4C carbide, Fe₃O₄—

Ni composite and Fe₂O₃;

Sb₂O₃;

and

a rubber softening oil.

16. The radar wave camouflage structure as claimed in claim 15, further comprising:

the second layer having a thickness between about 0.1 and 1 mm on the first layer, comprising;

a polyurethane (PU) resin;

carbon black dispersed in the second polymer matrix;

a filler comprising zinc stearate;

a matting agent; and

a rubber softening oil, wherein an absorbance of the radar wave camouflage structure is greater than 10 dB in a 8˜

12 GHz frequency band.

17. A method of fabricating a radar wave camouflage structure, comprising:

providing a substrate;

forming a first layer on the substrate, comprising;

a first polymer matrix; and

magnetic nanoparticles dispersed in the first polymer matrix, wherein the magnetic nanoparticles comprise a mixture of Fe₃O₄, Fe₃O₄-4C carbide, Fe₃O₄—

Ni composite and Fe₂O₃; and

forming a second layer on the first layer, comprising;

a second polymer matrix; and

carbon black dispersed in the second polymer matrix.

18. The method of fabricating the radar wave camouflage structure as claimed in claim 17, further comprising forming a third layer on the second layer comprising:

a third polymer matrix; and

carbon black dispersed in the third polymer matrix.

19. The method of fabricating the radar wave camouflage structure as claimed in claim 18, wherein the third layer further comprises a filler comprising zinc stearate and a matting agent.

20. The method of fabricating the radar wave camouflage structure as claimed in claim 18, wherein the third layer further comprises wax and a rubber softening oil.

21. The method of fabricating the radar wave camouflage structure as claimed in claim 17, wherein the first, second and third polymer matrix are polyurethane (PU) resin.

22. The method of fabricating the radar wave camouflage structure as claimed in claim 17, wherein the first layer further comprises Sb₂O₃ and a rubber softening oil.

23. The method of fabricating the radar wave camouflage structure as claimed in claim 17, wherein the first layer further comprises a crosslinker comprising polyisocyanate.

24. The method of fabricating the radar wave camouflage structure as claimed in claim 17, wherein the second layer further comprises a filler comprising zinc stearate, a matting agent and a rubber softening oil.

25. The method of fabricating the radar wave camouflage structure as claimed in claim 17, wherein the magnetic nanoparticles have an average particle size between 1 nm to 9.9 nm.

26. The method of fabricating the radar wave camouflage structure as claimed in claim 17, wherein the substrate comprises cloth.

27. The method of fabricating the radar wave camouflage structure as claimed in claim 26, further comprising:

forming the first layer of radar wave camouflage materials having a thickness between about 10 and 50 μ

m on the substrate, comprising;

a polyurethane (PU) resin;

magnetic nanoparticles dispersed in the polyurethane (PU) resin, wherein the magnetic nanoparticles comprise a mixture of Fe₃O₄, Fe₃O₄-4C carbide, Fe₃O₄—

Ni composite and Fe₂O₃;

Sb₂O₃; and

a rubber softening oil.

28. The method of fabricating the radar wave camouflage structure as claimed in claim 27, further comprising:

forming the second layer having a thickness between about 0.1 and 1 mm on the first layer, comprising;

a polyurethane (PU) resin;

carbon black dispersed in the second polymer matrix;

a filler comprising zinc stearate;

a matting agent; and

a rubber softening oil, wherein an absorbance of the radar wave camouflage structure is greater than 10 dB in a 8˜

12 GHz frequency band.

29. The method of fabricating the radar wave camouflage structure as claimed in claim 17, wherein the substrate comprises metal.

30. The method of fabricating the radar wave camouflage structure as claimed in claim 28, further comprising:

forming the first layer of radar wave camouflage materials having a thickness between about 10 and 50 μ

m on the substrate, comprising;

a polyurethane (PU) resin;

magnetic nanoparticles dispersed in the first polymer matrix, wherein the magnetic nanoparticles comprise a mixture of Fe₃O₄, Fe₃O₄-4C carbide, Fe₃O₄—

Ni composite and Fe₂O₃; and

a rubber softening oil.

31. The method of fabricating the radar wave camouflage structure as claimed in claim 30, further comprising:

forming the second layer having a thickness between about 1 and 2 mm on the first layer, comprising;

carbon black dispersed in the second polymer matrix;

a filler comprising zinc stearate;

a matting agent; and

a rubber softening oil.

32. The method of fabricating the radar wave camouflage structure as claimed in claim 31, further comprising:

forming the third layer having a thickness between about 0.1 and 1 mm on the second layer, comprising;

a polyurethane (PU) resin;

carbon black dispersed in the third polymer matrix;

a filler comprising zinc stearate;

a matting agent;

an anti-oxidant;

wax; and

a rubber softening oil, wherein an absorbance of the radar wave camouflage structure is greater than 10 dB in a 8˜

12 GHz frequency band.