The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 2000
Filed:
Jan. 13, 1997
Vikram Joshi, Colorado Springs, CO (US);
Kenichi Kimura, Los Angeles, CA (US);
Carlos A Paz de Araujo, Colorado Springs, CO (US);
Hiroshi Kiyokawa, Yokohama, JP;
Symetrix Corporation, Colorado Springs, CA (US);
Fujita Corporation, , JP;
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 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.