Patent application number | Description | Published |
20110273243 | COMBINER COMPRISING ACOUSTIC TRANSDUCERS - An electrical signal combiner includes at least one first element and a second element respectively connected to a first input port and to a second input port, and a third element connected to an output port, the electrical signals being propagated between the input and output ports. The combiner includes a medium; and the first, second and third elements are acoustic wave transducers, the electrical signals being carried by acoustic waves propagated between the input and output ports within the medium. Advantageously, the first transducer and the third transducer are separated by an acoustic distance of (2k+1)λ/4 with k an integer greater than or equal to 0 with λ the acoustic propagation wavelength; the second transducer and the third transducer are separated by an acoustic distance of (2k′+1)λ/4 with k′ an integer greater than or equal to 0; and the first and second transducers are separated by an acoustic distance of (2k″+2)λ/4 with k″ an integer greater than or equal to 0—in such a manner as to, on the one hand, generate constructive interference at the output port and, on the other hand, to isolate the first and second input ports by destructive interference of acoustic waves at the ports. | 11-10-2011 |
20120204415 | Process for Producing an Acoustic Device Having a Controlled-Bandgap Phononic Crystal Structure Containing Conical Inclusions - A process for producing an acoustic device having a phononic crystal structure comprising inclusions produced in a first medium distributed in a matrix of a second medium, to block propagation of acoustic waves within a bandgap frequency band, includes: defining geometric parameters of said inclusions, which have walls contacting said matrix, making at least one non-zero first wall angle, to the normal of the plane of said structure, said geometric parameters including said first wall angle; determining a function relating to variation in frequency position of said bandgap with said wall angle or relating to variation in width of said bandgap with said wall angle; determining said at least first angle, for a selected frequency position and/or selected width of the bandgap, from the function or functions determined beforehand; and producing said inclusions having at least said first wall angle in said matrix formed by said second medium. | 08-16-2012 |
20120206216 | ACOUSTIC WAVE DEVICE INCLUDING A SURFACE WAVE FILTER AND A BULK WAVE FILTER, AND METHOD FOR MAKING SAME - An acoustic wave device comprising at least one surface acoustic wave filter and one bulk acoustic wave filter, the device including, on a substrate comprising a second piezoelectric material: a stack of layers including a first metal layer and a layer of a first monocrystalline piezoelectric material, wherein the stack of layers is partially etched so as to define a first area in which the first and second piezoelectric materials are present and a second area in which the first piezoelectric material is absent; a second metallization at the first area for defining the bulk acoustic wave filter integrating the first piezoelectric material, and a third metallization at the second area for defining the surface acoustic wave filter integrating the second piezoelectric material. | 08-16-2012 |
20130106243 | Acoustic Wave Electromechanical Device Comprising a Transduction Region and an Extended Cavity | 05-02-2013 |
20130106531 | Acoustic Wave Power Device | 05-02-2013 |
20130214878 | Acoustic Wave Bandpass Filter Comprising Integrated Acoustic Guiding - An acoustic wave bandpass filter comprises at least an input first acoustic wave resonator with an output surface, and an output second acoustic wave resonator with an input surface, said resonators being coupled to each other along a set direction, the input and output surfaces being substantially opposite, and at least one first phononic crystal structure between said input and output resonators and/or a second phonic crystal structure at the periphery of said resonators so as to guide the acoustic waves, generated by said input resonator, toward said output resonator along said set direction, the resonators ensuring an impedance conversion and/or a mode conversion. | 08-22-2013 |
20130214879 | LATERALLY COUPLED BAW FILTER EMPLOYING PHONONIC CRYSTALS - An acoustic wave bandpass filter comprises at least two bulk acoustic wave resonators, laterally coupled to each other acoustically, each resonator including a film of piezoelectric material and at least a first electrode and/or a second electrode, said bulk waves propagating in a direction perpendicular to the plane of the film of piezoelectric material, characterized in that: it further comprises at least a first phononic crystal structure between said resonators such that the transmission coefficient of the lateral acoustic waves can be decreased in a direction parallel to the plane of the piezoelectric film; and the first phononic crystal structure is formed in a matrix of dielectric material or with patterns made from dielectric material. | 08-22-2013 |
20130249648 | HBAR Resonator Comprising A Structure For Amplifying The Amplitude Of At Least One Resonance Of Said Resonator And Methods For Producing Such A Resonator - An HBAR resonator comprises, on a substrate, a piezoelectric transducer, said transducer comprising at least one piezoelectric layer, at least two series of electrodes and exhibiting resonance frequencies Fi corresponding to wavelengths λi, characterized in that it comprises an amplification structure comprising at least one resonant cavity arranged on the substrate between said transducer and said substrate or in said substrate, this amplification structure being suitable for mechanically resonating at least one of the resonance frequencies Fi of said transducer corresponding to said wavelength λi, so as to amplify the amplitude of the electrical resonance generated at said frequency. | 09-26-2013 |
20140085020 | ACOUSTIC STRUCTURE COMPRISING AT LEAST ONE RESONATOR AND AT LEAST ONE COINTEGRATED CAPACITOR IN ONE AND THE SAME PIEZOELECTRIC OR FERROELECTRIC LAYER - An acoustic structure, comprising at least one acoustic resonator exhibiting at least one resonant frequency in a band of operating frequencies and an integrated capacitor, further comprises: a stack of layers, comprising at least one active layer of piezoelectric material or of ferroelectric material; the resonator being frequency tunable and being produced by a first subset of layers of the stack comprising the at least one active layer and at least two electrodes; the integrated capacitor being produced by a second subset of layers comprising the active layer and at least two electrodes; the first and second subsets of layers being distinguished by a modification of layers so as to exhibit different resonant frequencies. | 03-27-2014 |
20140151151 | HETEROGENOUS ACOUSTIC STRUCTURE FORMED FROM A HOMOGENEOUS MATERIAL - An acoustic structure comprising comprises a layer of material having a first Young's modulus called the intrinsic modulus and a first density called the intrinsic density, characterized in that the layer comprises at least one first zone having said first Young's modulus and said first density and at least one second zone buried in the volume of said layer of material and having a second Young's modulus and/or a second density obtained by implanting and/or by diffusing atoms into the volume of said layer. | 06-05-2014 |