Patent ID: 7245060
Filing Date: 2007-07-17
Classification: H03H

Abstract:
1. A piezoelectric resonator comprising: an R-plane sapphire substrate having a (0,1,−1,2) crystal face parallel to a surface the substrate and having at least one piezoelectric resonant unit on said surface; wherein the piezoelectric resonant unit comprises a tabular piezoelectric material of a wurtzite structure compound crystal epitaxially grown such that a (1,1,−2,0) crystal face is parallel to the (0,1,−1,2) crystal face of the R-plane sapphire substrate, the tabular piezoelectric material having a pair of principal surfaces; and a pair of excitation electrodes disposed on the pair of principal surfaces opposite to each other in the thickness direction of the piezoelectric material such that the pair of excitation electrodes sandwich the C plane which is a (0,0,0,1) crystal face perpendicular to the (1,1,−2,0) crystal face of the piezoelectric material.