Patent ID: 8436432

Claim:
A radio frequency (RF) microelectromechanical system (MEMS) switch, comprising: a substrate; a first electrode, disposed on the substrate; a first insulating layer, covering the first electrode; a second insulating layer, covering a portion of the substrate; a second electrode, disposed in the second insulating layer and located at a plane different from a plane of the first electrode; a fourth electrode, disposed in the second insulating layer, wherein the first electrode is located between the second electrode and the fourth electrode; and a movable electrode, partially disposed on a surface of the second insulating layer, and extending over the first electrode and the second electrode, wherein a portion of the movable electrode not disposed on the surface of the second insulating layer is a movable portion, wherein the second insulating layer comprises a gap, and the gap exposes a space between the movable portion and the first insulating layer and a space between the movable portion and the second electrode, and wherein the movable portion of the movable electrode further comprising: a first conducting element, wherein the gap exposes a space between the first conducting element and the second electrode; a second conducting element, wherein the gap exposes a space between the second conducting element and the fourth electrode; and a bridge metal layer, located above the first electrode and on a plane between the fourth electrode and the second conducting element, and respectively coupled to the second conducting element and the first conducting element.