Materials for electromagnetic wave absorption panels

• US 5,853,889 A
• Filed: 01/13/1997
• Issued: 12/29/1998
• Est. Priority Date: 01/13/1997
• Status: Expired due to Fees

• Current Assignee: Fujita Corporation (Daiwa House Industry Company Limited), Symetrix Corporation
• Original Assignee: Fujita Corporation (Daiwa House Industry Company Limited), Symetrix Corporation
• Inventors: Paz de Araujo, Carlos A., Kimura, Kenichi, Joshi, Vikram, Kiyokawa, Hiroshi
• Primary Examiner(s): Krynski, William
• Assistant Examiner(s): Bahta, Abraham
• Application Number:
  US08/782,938
• Time in Patent Office: 715 Days
• Field of Search: 428/545, 428/546, 428/411.1, 428/48, 428/49, 428/47, 428/688, 428/294, 428/76, 428/172, 428/209, 428/192, 428/212, 428/418, 428/699, 428/469, 428/472, 428/913, 342/1, 342/4, 52/145, 52/786.11, 174/35 R, 174/137 R, 252/62.64, 252/62.62, 501/137, 501/138
• US Class Current: 428/411.1
• CPC Class Codes: E04B 1/92 Protection against other undesired influences or dangers buildings providing protection against external dangers E04H9/00; shielding against dangerous radiation G21F
• CPC Class Codes: H01Q 17/00 Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
• CPC Class Codes: H01Q 17/004 using non-directional dissipative particles, e.g. ferrite powders H01Q17/005 takes precedence; flake-like H01Q17/002
• CPC Class Codes: H01Q 17/007 with means for controlling the absorption
• CPC Class Codes: H01Q 17/008 with a particular shape H01Q17/007 takes precedence
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/12007 Component of composite having metal continuous phase interengaged with nonmetal continuous phase
• CPC Class Codes: Y10T 428/12014 having metal particles
• CPC Class Codes: Y10T 428/163 Next to unitary web or sheet of equal or greater extent
• CPC Class Codes: Y10T 428/166 Glass, ceramic, or metal sections [e.g., floor or wall tile, etc.]
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/24777 Edge feature
• CPC Class Codes: Y10T 428/24917 including metal layer
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]
• CPC Class Codes: Y10T 428/31529 Next to metal

Abstract

An electromagnetic wave absorption panel for use in building construction includes a protective tile layer, an absorber layer, a metal reflective layer, and a building support layer, such as concrete. The absorber layer utilizes novel materials including high dielectric constant materials, such as ABO₃ type perovskites, layered superlattice materials, conducting oxides, and signet magnetics, ferroelectrics, such as ABO₃ type perovskites and layered superlattice materials, garnets, a nickel-zinc ferrite, Ni₀.4 Zn₀.6 Fe₂ O₄, and polymer-ceramic composites of the above materials.

Claims

1. An electromagnetic wave absorption panel for use in building construction, said absorption panel comprising:

a building support element; and

an absorber element supported by said support element, said absorber element comprising a high dielectric constant material, said high dielectric constant material selected from the group consisting of layered superlattice materials and signet magnetics.

2. An electromagnetic wave absorption panel as in claim 1 wherein said absorber element further comprises a ferrite.

3. An electromagnetic wave absorption panel as in claim 1 wherein said absorber element further comprises a polymer.

4. An electromagnetic wave absorption panel as in claim 1 wherein said high dielectric constant material further comprises BST.

5. An electromagnetic wave absorption panel for use in building construction, said absorption panel comprising:

a building support element; and

an absorber element supported by said support element, said absorber element comprising a layered superlattice material.

6. An electromagnetic wave absorption panel as in claim 5 wherein said absorber element further comprises a ferrite.

7. An electromagnetic wave absorption panel as in claim 5 wherein said absorber element further comprises a polymer.

8. An electromagnetic wave absorption panel as in claim 5 wherein said ferroelectric material further comprises barium titanate.

9. An electromagnetic wave absorption panel as in claim 5 wherein said material comprises a material selected from the group consisting of strontium bismuth tantalate, strontium bismuth niobate, strontium bismuth titanate, strontium bismuth zirconate, and solid solutions thereof.

10. An electromagnetic wave absorption panel for use in building construction, said absorption panel comprising:

a building support element; and

an absorber element supported by said support element, said absorber element comprising a composite of a polymer and a second material selected from the group consisting of;

layered superlattice materials, magnetoplumbites, garnets, and signet magnetics.

11. An electromagnetic wave absorption panel as in claim 10 wherein said second material further comprises a nickel-zinc ferrite.

12. An electromagnetic wave absorption panel as in claim 10 wherein said second material comprises yttrium iron garnet.

13. An electromagnetic wave absorption panel as in claim 10 wherein said second material comprises a material selected from the group consisting of strontium bismuth tantalate, strontium bismuth niobate, strontium bismuth titanate, strontium bismuth zirconate, and solid solutions thereof.

14. An electromagnetic wave absorption panel for use in building construction, said absorption panel comprising:

a building support element; and

an absorber element supported by said support element, said absorber element comprising.

19. An electromagnetic wave absorption panel as in claim 14 wherein said absorber element comprises a composite of a polymer and said LSM.

15. An electromagnetic wave absorption panel for use in building construction, said absorption panel comprising:

a building support element; and

an absorber element supported by said support element, said absorber element comprising a garnet.

16. An electromagnetic wave absorption panel as in claim 15 wherein said garnet comprises yttrium iron garnet.

17. An electromagnetic wave absorption panel for use in building construction, said absorption panel comprising:

a building support element; and

an absorber element supported by said support element, said absorber element comprising a magnetoresistive material;

wherein the magnetoresistive material is selected from the group consisting of La₀.67 Sr₀.33 MnO₃, La_x Ca.sub.(1-x) MnO₃ and La_x Pb.sub.(1-x) MnO₃ where 0<

x<

1.

18. An electromagnetic wave absorption panel for use in building construction, said absorption panel comprising:

a building support element; and

an absorber element supported by said support element, said absorber element comprising Ni _x Zn_01-x Fe₂ O₄ where 0.35≦

x ≦

0.4.