Electromagnetic radiation absorber and method for the production thereof
US5561428A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1985 |
| Grant date | Oct 1, 1996 |
| Priority date | — |
| Expiry date | Feb 12, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q17/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is an electromagnetic radiation absorber comprising a filamentary, three-dimensional, porous substrate of dielectric material having a relatively thin layer of electrically conductive material deposited thereupon. The layer is characterized by a generally gradual and continuous reduction in its thickness or bulk with inward progression into the substrate from one side thereof, thus resulting in a layer exhibiting a graduated resistivity. A filler substantially pervious to the radiation of interest may be disposed in the interstitial voids between filaments, and relatively small diameter magnetic/magnetizeable particles may be suspended in the filler to thereby further extend the useful frequency range of the absorber. Also disclosed is a sputtering method for producing such an absorber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.