Patent ID: 7960662

Claim:
A structure of a radiofrequency or microwave micro-switch of the capacitor type with a first capacitor plate comprising a voltage controlled electrode disposed in a switching region between a first conducting line, called input signal line, and a second conducting line, called output signal line, disposed in the projected extension of one another, separated by the switching region, a second capacitor plate being a flexible membrane disposed above said switching region, the two capacitor plates being separated by a thickness of vacuum or of gas and at least one layer of a dielectric material, two parallel ground lines being disposed symmetrically with respect to the signal lines, said structure being formed on an insulating substrate coated with a passivation layer, wherein: said control electrode is formed on said passivation layer, said layer of dielectric material has a high relative permittivity greater than a hundred, and it is deposited onto said control electrode, in such a manner that in the direction of the input and output lines, said dielectric material only rests on said control electrode and, in the orthogonal direction, said dielectric material protrudes on either side and comes into contact with said passivation layer of the substrate, the flexible membrane is conducting and comprises at least one layer of a conducting material, at least one insulating layer, made of a material different from that of the passivation layer, separates the level of the ground lines from the level of the signal lines.