Magnetically-actuated dielectric cantilever RF MEMS switches

Abstract

Fully integrated novel magnetically-actuated dielectric cantilever MEMS switches suitable for high frequency RF applications are reported. A four-mask fabrication process has been developed to produce the MEMS switches with integrated current coils on both the substrate and the dielectric cantilever. The switches are actuated using an electromagnetic force and held in the DOWN state using an electrostatic force. DC actuation currents around 110 mA have been measured to be sufficient for operating the switch. The beam is maintained at DOWN state with the application of a potential difference as low as 24 V between the coils. In terms of the RF performance, the insertion and return losses are lower than -0.3 dB and -24 dB, respectively; and isolation is higher than 34 dB up to 10 GHz. To enhance the switch reliability, it is feasible to force the device into the UP state using a repulsive electromagnetic force in the case of release failure or stiction.