Patent ID: 7609132

Claim:
An acoustic resonant structure comprising a support and a piezoelectric transducer, which includes a first conductive electrode put in place on the support and a second conductive electrode, separated by a layer of piezoelectric material, with the thickness of the layer of piezoelectric material being given by the relationship e 18 = ( n ′ + x ) · V 18 F 0 , where n′ is a natural integer, x a real number of approximately 0.5, V 18 is the propagation velocity of the acoustic wave in the piezoelectric material and F 0 is the operating frequency of the resonant structure, and an additional layer put in place on the surface of the second electrode opposite the piezoelectric layer, with the thickness of the additional layer being fixed so as to optimize the acoustic-electric density within the piezoelectric layer, wherein the resonant structure is of an HBAR type.