Apparatus for local reduction of electromagnetic field using an active shield and method thereof
US6957051B1 · kind B1 · utility
9Cited by
15References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2000 |
| Grant date | Oct 18, 2005 |
| Priority date | — |
| Expiry date | Feb 25, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/3838
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for shielding an operator from electromagnetic fields emitted from an antenna in a portable communication device. A plurality of active shields are placed between the operator's earpiece and the antenna to dampen the effects of the electromagentic fields. The active shields are coupled to adjustment circuits which may include variable gain amplifiers and phase couplers to offset the antenna signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.