Symetrix Corporation

Fujita Corporation

Kenichi Kimura

Carlos Alberto Paz De Araujo

Vikram Joshi

Hiroshi Kiyokawa

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 is multi-component structure, such as: a high dielectric constant layer and ferrite layer; a ferrite layer and a low dielectric constant layer; a ferrite and a polymer; a polymer and a material having a higher dielectric constant than the polymer; a ferroelectric, a ferrite, and a polymer; a ferrite, a polymer, and a high dielectric constant material; and a high dielectric constant material, a material in which the imaginary part of the permeability is greater than or equal to the real part of the permeability, and a low dielectric constant material. The invention also includes combinations of the above, such as: a high dielectric constant material, a ferrite, and a low dielectric constant material; and multiple layers of a ferrite and a polymer. The invention further includes the above structures and combinations with specific materials, such as a ferrite, a polymer, LSM, and a high dielectric constant material; and a ferrite, a polymer, and BST. The invention also includes: a multi-component absorber element having an effective real part of the permitivity, .epsilon.'.sub.eff, and an effective real part of the permeability, .mu.'.sub.eff, such that (.epsilon.'.sub.eff .mu.'.sub.eff).sup.1/2 .about.1/f over said range of frequencies, where f is the frequency of the incident wave; and a multi-component absorber element having an effective real part of the permitivity, .epsilon.'.sub.eff, that decreases with frequency.

Multi-component electromagnetic wave absorption panels

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 ABO.sub.3 type perovskites, layered superlattice materials, conducting oxides, and signet magnetics, ferroelectrics, such as ABO.sub.3 type perovskites and layered superlattice materials, garnets, a nickel-zinc ferrite, Ni.sub.0.4 Zn.sub.0.6 Fe.sub.2 O.sub.4, and polymer-ceramic composites of the above materials.

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Los Angeles, CA, United States of America

Kenichi Kimura