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:
Jun. 24, 1997
Filed:
May. 09, 1995
Richard Scott Grannemann, Benbrook, TX (US);
Lockheed Corporation, Fort Worth, TX (US);
Abstract
An apparatus for providing broadbanded electromagnetic radiation attenuation is disclosed. The apparatus comprises a surface mount to which a plurality of protuberances are mounted. Each protuberance is further made up of a plurality of impedance sheets that are substantially concentric one with another. The impedance sheets are directionally shaped so as to enhance absorption of any polarization of plane wave radiation from any incidence direction including near grazing incidence. The impedance sheets have impedance values which are tapered with higher impedance values belonging to the sheets farther away from the concentric center. These sheets may be either substantially spherical, hemispherical, or circular cylinders. The distance separating neighboring impedance sheets is selected according to the shortest wavelength for which good electromagnetic attentuation is desired. Further, additional layers of attenuation materials may also be provided, which comprise substantially the same materials as the first layer, namely additional pluralities of protuberances and additional pluralities of directionally shaped impedance sheets.