Shielded multilayer printed wiring board, high frequency, high isolation
US5677515A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1991 |
| Grant date | Oct 14, 1997 |
| Priority date | — |
| Expiry date | Oct 18, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2201/09981
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A shielded printed wiring board is disclosed which provides electrical and magnetic isolation for the signal layers located thereon. The printed wiring board includes a signal layer laminated between two non-conductive dielectric layers. The bottom side of the printed wiring board has a conductive layer coated thereon. Grooves are routed through the printed circuit board on both sides of each signal layer extending from the top layer partially through to the conductive layer. Conductive metallic coatings are then provided to coat the board and thereby encapsulate the signal layer in a ground envelope, separated by a controlled thickness dielectric. In an alternate embodiment, a plurality of layers are laminated one on top of the other to provide a multilayer printed wiring board.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.