Patent ID: 8189319
Filing Date: 2012-05-29
Classification: H01G,H01H

Abstract:
1. A MEMS variable capacitor comprising: a first connection beam having one end fixed to a substrate and another end served as a connection beam end; a first actuation beam having one end connected to the first connection beam end, another end served as a first connection end and a first piezoelectric film sandwiched between a first lower electrode and a first upper electrode; a second actuation beam having one end served as a second connection end connected to the first connection end, extending from the second connection end in a parallel and reverse direction to the first actuation beam, and having another end served as a first action end and a second piezoelectric film sandwiched between a second lower electrode and a second upper electrode; a second connection beam having one end fixed to the substrate and another end served as a second connection beam end; a third actuation beam having one end connected to the second connection beam end, another end served as a third connection end and a third piezoelectric film sandwiched between a third lower electrode and a third upper electrode; a fourth actuation beam having one end served as a fourth connection end connected to the third connection end, extending from the fourth connection end in a parallel and reverse direction to the third actuation beam, having another end served as a second action end and a fourth piezoelectric film sandwiched between a forth lower electrode and a fourth upper electrode; a movable electrode provided between the first action end and the second action end; a fixed electrode provided on the substrate opposed to the movable electrode; a third connection beam having one end fixed to the substrate and another end served as a third connection beam end; a fifth actuation beam having one end connected to the third connection beam end, another end served as a fifth connection end and a fifth piezoelectric film sandwiched between a fifth lower electrode and a fifth upper electrode; a sixth actuation beam having one end served as a sixth connection end connected to the fifth connection end, extending from the sixth connection end in a parallel and reverse direction to the fifth actuation beam, and having another end served as a third action end and a sixth piezoelectric film sandwiched between a sixth lower electrode and a sixth upper electrode; a fourth connection beam having one end fixed to the substrate and another end served as a fourth connection beam connected to a fourth connection beam end; a seventh actuation beam having one end connected to the fourth connection beam end, another end served as a seventh connection end and a seventh piezoelectric film sandwiched between a seventh lower electrode and a seventh upper electrode; and an eighth actuation beam having one end served as an eighth connection end connected to the seventh connection end, extending from the eighth connection end in a parallel and reverse direction to the seventh actuation beam, and having another end served as a fourth action end and an eighth piezoelectric film sandwiched between an eighth lower electrode and an eighth upper electrode, the movable electrode being provided between the third action end and the fourth action end, the first and third actuation beams being placed on a first line, the second and fourth actuation beams being placed on a second line, and the first and second actuation beams and the third and fourth actuation beams being placed symmetrically about a third line, the fifth and seventh actuation beams being placed on a fourth line, the sixth and eighth actuation beams being placed on a fifth line, and the fifth and sixth actuation beams and the seventh and eighth actuation beams being placed symmetrically about the third line, and the first, second, third, fourth connection beams, and the movable electrode being made of a conductive monolayer.