Microelectromechanical switches have demonstrated great potential in microwave and millimeter-wave circuits for their superior high-frequency performance.Most of researches on MEMS switches were concentrated on the structural design and mechanical analysis of their beams.There are few researches that have been done to analyze the electromagnetic characteristics of the MEMS switches
especially the high-frequency impedance matching of the switches.In this paper
the on-state impedance matching formulation of MEMS switches is developed based on the results of the high-frequency transmission line
and the electromagnetic characteristics of MEMS switches are confirmed by using the HFSS software.This helps to design high-performance RF MEMS switches.