Active prevention of radio frequency emissions from a mobile communications unit in restricted areas

US6246891A · kind A · utility

Assignee

• Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

• B. Johanna Isberg · Lund, SE
• Mikael Dahlkvist · Södra Sandby, SE
• L. Fredrik Liljegren · Malmö, SE
• Ulf Bjorkengren · Bjärred, SE
• Anders Khullar · Bjärred, SE

Key dates

• Filing date: Nov 19, 1997
• Grant date: Jun 12, 2001
• Expiry date: Nov 19, 2017

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B1/3833
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

To enable use of an intelligent mobile communication unit (1) in areas where there are restrictions on the emission of radio frequency energy, the unit is provided with means (3) for actively preventing radio frequency radiation from the unit (1) even if non-radio frequency energy emitting parts of the unit (1) are operable.