Ferroelectric lens

US7777683B2 · kind B2 · utility

Assignee

• Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

• Ola Tageman · Handen, SE
• Spartak Gevorgyan · Gothenburg, SE
• Anatoli Deleniv · Mölndal, SE
• Pierre Filhol · Orsay, FR
• Vladimir Cherman · Heverlee, BE

Key dates

• Filing date: Dec 8, 2004
• Grant date: Aug 17, 2010
• Expiry date: Apr 9, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01Q3/44
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A lens (300, 500) is disclosed for steering the exit direction (Ω) of an incident electromagnetic wave. The lens comprises a main body (210, 510) of a ferroelectric material with a first main surface (207, 507) and a first transformer (220, 222). The electromagnetic wave enters and exits the lens through the transformer, and the lens comprises means (370, 380) for creating a DC-field in a first direction in the main body. The main body (210, 510) of ferroelectric material comprises a plurality (21011-210NN, 51011-510NN) of slabs of the ferroelectric material, each slab also comprising a first (403, 603) and a second electrode of a conducting material. The means for creating a DC-field can create a gradient DC-field in the first direction using the first and second electrodes, so that the dielectric constant in the main body will also be a gradient in the first direction, thus enabling steering of the existing electromagnetic wave.