Patent ID: 7777683

Claim:
A lens for steering an exit direction (Ω) of an electromagnetic wave which is incident upon the lens, the lens comprising a main body with a first and second main surface and a first transformer which is adjacent to said first main surface of said main body, said electromagnetic wave entering the lens through said first transformer and exiting the lens through the second main surface, the main body comprising a plurality of discrete slabs of ferroelectric material, each slab in said plurality also comprising a first and a second electrode of an electrically conducting material, the slabs additionally comprise at least a third resistive electrode of an electrically conducting material where the third resistive electrode is located between the first and the second electrodes, said lens additionally comprising means for grounding the first and second electrodes on said plurality of slabs, first means for creating a first DC field in a first direction in the main body using a first voltage divider network and the third resistive electrodes, the first means for creating a first DC field is located on the first main surface of the main body such that a dielectric constant in the main body will also be a gradient in said first direction thus enabling steering of the exiting electromagnetic wave, said first direction being essentially parallel to said first main surface of the main body, and second means for creating a second DC field in a second direction in the main body using a second voltage divider network and the third resistive electrodes, the second means for creating a second DC field is located on the second main surface of the main body, said second direction parallel to at least one of said first and second surfaces of the main body, but non-coincidental with the first direction of the first DC-field, by means of which the dielectric constant in the main body is caused to be gradient in said second direction as well, thus enabling additional steering of the exiting electromagnetic wave in said second direction as well.