Wave absorber, and an anechoic chamber using the same
US4972191A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1989 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Jul 24, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q17/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flat wave absorber having a conductive plate, a dielectric plate on the conductive plate, and, a ferrite plate on said dielectric plate, provides a wide operational frequency range from 30 MHz to 1 GHz with excellent attenuation characteristics, and an anechoic chamber mounting said wave absorber on inside surface of the chamber is provided. Thickness of said dielectric plate is less than 25 mm, the thickness of said ferrite plate is less than 7.5 mm, and real part of complex impedance of said ferrite plate on the conductive plate is less than 1.0 and close to 1.0. Said ferrite plate is attached to said dielectric plate in the form of tiles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.