Patent ID: 7556978

Claim:
A method of making a piezoelectric MEMS switch comprising: forming a sacrificial layer on a substrate; forming a first electrode layer over the substrate and the sacrificial layer; forming an annealed piezoelectric dielectric layer over the first electrode layer; forming a second electrode layer over the annealed piezoelectric layer, the second electrode layer cooperating with the first electrode layer and the annealed piezoelectric dielectric layer to form a piezoelectric actuator; patterning the piezoelectric actuator to create a through-hole through which the sacrificial layer is exposed; after forming the annealed piezoelectric dielectric layer, forming radio frequency signal lines adjacent the first and second electrode layers; removing the sacrificial layer through the through-hole to create a void underlying the piezoelectric actuator; forming a polymer coat over the piezoelectric actuator, the polymer coat extending through the through-hole and into the void to contact the substrate and define a polymeric finger supporting the piezoelectric actuator; forming a contact in the polymer coat; forming a boom mechanically coupling the piezoelectric actuator to the contact; and removing the polymer coat including the polymeric finger.