Microwave components with a surface coating which imparts a very high RF loss
US4971856A · kind A · utility
2Cited by
10References
16Claims
0Family size
Inventors
Key dates
| Filing date | Jul 12, 1988 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Jul 12, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/25
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To selectively and controllably increase RF surface power loss in microwave components, the component surfaces are overcoated with a suspension of conductive particles in a viscous binder of thickness less than a wavelength at the operating frequency. The binder is compounded so as to fire to a glassy matrix that is a durable, heat-resistant and vacuum-compatible dielectric. The metal particle size, which is selected to fit within the coating thickness, is preferably large compared with the RF skin depth of the conductive particles, but no smaller than one-quarter skin depth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.