Patent ID: 7484280
Filing Date: 2009-02-03
Classification: H03H,Y10T

Abstract:
1. A method for manufacturing a surface acoustic wave element having an interdigital transducer electrode formed on a semiconductor substrate, comprising: a) forming an insulation layer on a surface of an active side of the semiconductor substrate, said insulation layer having a whole top surface; b) forming a base layer on the whole surface of the insulation layer; c) planarizing a surface of the base layer; d) forming a piezoelectric member on the planarized surface of the base layer; e) forming the interdigital transducer electrode on a surface of the piezoelectric member; and f) forming a bank being higher than a height from the surface of the base layer to the surface of the interdigital transducer electrode on a peripheral of the surface of the base layer, thereby surrounding the piezoelectric member with said bank.