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In this paper, we present mechatronic design of RF microelectromechanical system (MEMS) switches. The design is conducted by both the mechanical and electromagnetic schemes on the basis of the finite element method and the full-wave electromagnetic simulation. The relationship among the microelectromechanical characteristics, such as effective stiffness constant, displacement, insertion loss, return loss, and isolation, and switch structures are investigated. The comprehensive mechatronic study of the RF MEMS switches provides a systematic design methodology for RFIC applications.