Abstract: A bulk wave acoustic resonant structure which is in accordance with the invention allows the difficulties encountered at high frequency, the impossibility of working at low frequency on simple structures and the absence of an adequate coupling level to be overcome. The invention therefore proposes the use of an additional layer of material which covers the upper electrode of a piezoelectric transducer in order to localize the position of maximum intensity of the dynamic stress close to the centre of the piezoelectric layer through the effect of propagation. The structure that is in accordance with the invention may be associated with Bragg mirrors and various uses are presented.
Type:
Grant
Filed:
July 28, 2006
Date of Patent:
October 27, 2009
Assignees:
Temex SAS, Centre National de la Receheche Scientifique
Inventors:
Sylvain Jean Ballandras, William Steichen, Jeremy Masson