Hybrid type wide band electromagnetic wave absorber
US5617095A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Oct 18, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q17/008
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A hybrid-type wide band electromagnetic wave absorber having cone-shaped projections of a reduced may be produced by matching the impedance of the cone-shaped absorber members and the underlying plate type absorber. Such a hybrid-type wide band electromagnetic wave absorber is formed by arranging tapered cone-shaped members in a regular pattern on a sintered ferrite plate, which is disposed on a metal plate. The cone-shaped members are formed of a material selected from a ferrite and a ferrite composite and each have a normalized cross-sectional area at the base of 0<S.sub.0 <1 and an exponent of cone shape of 0<n<10. Such a hybrid type electromagnetic wave absorber may be used, for example, for performing EMI/EMS testing in an anechoic chamber in the frequency range of 30 MHz to 1 GHz. In the case of applications such as antenna testing in the frequency range of 30 MHz to 30 GHz, the height of the cone-shaped members must be appropriately increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.