Mems variable capacitor having a piezoelectric actuation mechanism based on a piezoelectric thin film

Abstract

A MEMS variable capacitor includes: a first connection beam having one end fixed to a substrate; a first actuation beam connected to the first connection beam; a second actuation beam connected to the first actuation beam and extending in a reverse direction; a second connection beam having one end fixed to the substrate; a third actuation beam connected to the second connection beam; a fourth actuation beam connected to the third actuation beam and extending in a reverse direction; a movable electrode provided between the second and fourth actuation beams; and a fixed electrode provided on the substrate opposed to the movable electrode. The first to fourth actuation beams have a piezoelectric film sandwiched between a lower electrode and an upper electrode, the first and third actuation beams are placed on a line, the second and fourth actuation beams are placed on a line, and the first and second actuation beams and the third and fourth actuation beams are placed symmetrically about a line.