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Piezoelectric MEMS switches and methods of making

  • US 7,556,978 B2
  • Filed: 02/28/2006
  • Issued: 07/07/2009
  • Est. Priority Date: 02/28/2006
  • Status: Expired due to Fees
First Claim
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1. 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.

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