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Novel coplanar microwave switches have been designed, fabricated, and tested. The switching element consists only of a thin vanadium dioxide (VO2) film patch. VO2 exhibits a first-order phase transition from a semi-conducting low temperature phase to a metallic high temperature phase resulting in an abrupt change of the electrical resistivity from 3?100 ?cm to 3?10?4 ?cm at a phase transition temperature...