Microwave switches allow routing of microwave signals through desired paths in the system and sub-system, and enable the realization of different schemes for signal combinations necessary for system implementation. They are two-state devices for the control of RF power flow in a microwave circuit. They are essential elements for a number of widely varying applications, ranging from highly sophisticated space communications systems to more common applications requiring the switching of an RF signal from one path to another. It is a circuit element widely used in phase shifters. Microwave switches are also used in a range of RF commercial systems such as cellular GSM, UMTS, cable modems, direct broadcast and other point-to-point and point-to-multi-point broadcast systems and applications.