Abstract: A method of interrogating a surface acoustic wave differential sensor formed by two resonators is provided, wherein the method allows the measurement of a physical parameter by determination of the difference between the natural resonant frequencies of the two resonators, which difference is determined on the basis of the analysis of a signal representative of the level of a signal received as echo of an interrogation signal, for a plurality of values of a frequency of the interrogation signal in a domain of predetermined values; the analysis can be based on the cross-correlation of the said signal representative of the level according to a splitting into two distinct frequency sub-bands. An advantage is that it may be implemented in a radio-modem.

Abstract: An electrical device includes a first electrical component and a second electrical component connected to each other via an electrical connection having an electrically insulating support plate and a weld joint deposited on the support plate. The weld joint has a melting temperature (Ta) significantly lower than an ambient operating temperature (Ta) to which at least one of the two electrical components and the electrical connection are subjected. The electrical device includes cement that completely covers the exposed weld joint. The material of the cement is chosen to maintain its adhesion and its tightness with respect to the weld joint when the Ta is applied.

Abstract: This sensor, comprises: a first surface acoustic wave device, comprising a first piezoelectric substrate, formed from a (YXw/t)/?/?/? cut of a Langasite crystal, where ? is equal to 0±5° is equal to 55±20° and ? is equal to 32.5±7.5° and a first resonator having a first transducer laying on a first propagation surface and having two sets of interdigitated first electrodes formed from an electrically conductive material having a high melting temperature; and a second surface acoustic wave device, comprising a second piezoelectric substrate, formed from a (YXw/t)/?/?/? cut of a Langasite crystal, where ? is equal to 0±5°, ? is equal to 5±20° and ? is equal to 0±7.

Abstract: The invention relates to an acoustic volume wave resonator including a mounting, a resonating substrate, and a diaphragm. The mounting comprises an internal cavity and an internal electrode, so as to form a gap area between the internal electrode and a portion of the diaphragm. The resonating substrate is configured to generate longitudinal mode acoustic waves vibrating at the work frequency of the resonator, when an electrostatic field having a sinusoidal component at a work frequency is generated in the gap area by applying a differential voltage between the diaphragm or the first surface of the resonating substrate on the one hand and the internal electrode on the other hand.

Abstract: A surface-guided bulk wave transducer (102) comprises a stack of an acoustic substrate (6), an electric ground plane (8), and a network (110) of synchronous acoustic excitation sources with two combs (112, 114) of elementary piezoelectric transducers (122, 124, 126, 128, 130, 132) alternately interlaced two-by-two according to a periodic network step corresponding to a propagation mode of a surface-guided bulk wave of the acoustic substrate (6). Each elementary piezoelectric transducer (122, 124, 126, 128, 130, 132) includes a single and different rod with a parallelepipedal shape for which the nature, the cut of the piezoelectric material, the height h, the width are selected for increasing the electromechanical coupling coefficient of the transducer assembly (102) to a high level.

Abstract: 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 ?i, 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 ?i, so as to amplify the amplitude of the electrical resonance generated at said frequency.

Abstract: The electrical device (2, 202) according to the invention comprises a first electrical component (4) and a second electrical component (6) connected to each other via an electrical connection means (26) having an electrically insulating support plate (24), and a weld joint (22) deposited on the support plate (24). The weld joint (22) has a melting temperature (TO significantly lower than an ambient operating temperature (Ta) to which at least one of the two electrical components and the electrical connection means (26) are provided to be subjected. The electrical device (2) comprises a cement (28) that completely covers the exposed weld joint (22), the material of the cement (28) being chosen to maintain its adhesion and its tightness with respect to the weld joint (22) when the ambient operating temperature (Ta) is applied.

Abstract: A transponder including a first resonator and a series of one or more second resonators with coupling of evanescent waves exhibiting at least one first resonant mode and one second resonant mode, said first resonator being connected via a first port, to a first means allowing an interrogation, wherein said second resonators are connected via at least one second port, to at least one variable load element capable of modifying coupling conditions of the resonant modes and consequently a response measured on said first port.

Abstract: The invention relates to an acoustic volume wave resonator configured to resonate at a predetermined work frequency comprising: a mounting (12), comprising a first surface (14) and a second surface (16), a resonating substrate (18), comprising a first surface (20) and a second surface (22), and a diaphragm (24) rigidly connecting the second surface (16) of the mounting on the one hand and the first surface (20) of the resonating substrate on the other hand, The mounting comprises an internal cavity (28) and an internal electrode (32), so as to form a gap area (34) between the internal electrode (24) and a portion (35) of the diaphragm.

Abstract: A piezoelectric and ferroelectric bulk wave transducer operating at a predetermined frequency includes a block of substrate, having a first thickness and in a first material, and a piezoelectric and ferroelectric transduction plate, having a length, a width and a second thickness, and in a second piezoelectric material, first and second metal electrodes covering the plate in the direction of the length thereof. The plate has first and second ferroelectric domains with alternating polarizations, distributed along the length of the plate according to a periodic pattern of pitch. The plate is attached perpendicularly to the block so that the width of the plate and the first thickness of the block are the same direction. The first and second material, the first thickness of the block, the length, the width, the second thickness, the pitch of the plate are configured for generating and trapping bulk waves at the operating frequency of the transducer, guided between both electrodes.

Abstract: The invention relates to a resonator of the harmonic bulk acoustic resonator HBAR type, comprising a piezoelectric transducer (6) clamped between two electrodes (4, 8) with a strong electroacoustic coupling, cut according to a first cutting angle ?1, and an acoustic substrate (10) with a working frequency acoustic quality coefficient at least equal to 5·1012, cut according to a second cutting angle ?2 with at least one shearing vibration mode. The transducer and the substrate are arranged in such a way that the polarization direction of the shearing mode of the transducer and the polarization direction of the shearing of the substrate are aligned, and the second cutting angle ?2 is such that the temperature coefficient of the frequency of the first order CTFB1 corresponding to the shearing mode and to the second cutting angle ?2 is zero with inversion of the sign thereof on either side of, or equal to, a bias.

Abstract: A bulk wave piezoelectric resonator operating at a predetermined frequency includes a substrate block, having a plane face, a first thickness and consisting of a first material, a resonant plate having a length, width and second thickness, and consisting of a second piezoelectric material, first and second metal electrodes at least partly covering the resonant plate on each side and partly facing each other. The resonant plate is fixed perpendicularly in the vicinity of the plane face of the substrate block so that the width of the resonant plate and the first thickness of the substrate block have the same direction, and the first material, the second material, the first thickness of the block of substrate, the length, the width, the second thickness of the resonant plate are configured for trapping bulk waves at the operating frequency of the resonator and for producing a plane-plane type bulk wave piezoelectric resonator.

Abstract: The invention relates to a resonator of the high bulk acoustic resonator HBAR type, for operating at a pre-determined working frequency, comprising: a piezoelectric transducer (6), an acoustic substrate (10), a counter-electrode (8) formed by a metal layer adhering to a first face of the transducer (6) and a face of the acoustic substrate (10), and an electrode (4) arranged on a second face of the transducer (6) facing away from the first face of the transducer (6) and the substrate (10).

Abstract: The elementary filter of the HBAR type includes two resonators (20, 22) of the HBAR type which are each formed by a transducer (8) and a substrate (12) which are coupled in a suitable manner by electroacoustic waves. The first resonator (20), the second resonator (22) and the coupling element (28) by way of evanescent waves include the same monobloc acoustic substrate (12) which is arranged facing and coupled to the piezoelectric transducer (8) by waves having the same longitudinal or transverse vibration mode through the same reference electrode (10).

Abstract: 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 ?i, 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 ?i, so as to amplify the amplitude of the electrical resonance generated at said frequency.

Abstract: A method of interrogating a surface acoustic wave differential sensor formed by two resonators is provided, wherein the method allows the measurement of a physical parameter by determination of the difference between the natural resonant frequencies of the two resonators, which difference is determined on the basis of the analysis of a signal representative of the level of a signal received as echo of an interrogation signal, for a plurality of values of a frequency of the interrogation signal in a domain of predetermined values; the analysis can be based on the cross-correlation of the said signal representative of the level according to a splitting into two distinct frequency sub-bands. An advantage is that it may be implemented in a radio-modem.

Abstract: A method of interrogating sensors of SAW type, which allows notably the gathering of physical measurements of parameters carried out by SAW sensors, the method for gathering the measurement of an SAW sensor comprising a first step of generating and emitting an electromagnetic signal corresponding to the dilated time-reversal of a dilation coefficient k, of an impulse response signature which is characteristic of the SAW sensor, a second step of gathering a signal received as echo originating from the SAW sensor, a third step of determining a maximum of cross-correlation of the signal received as echo during the second step, the first step being applied with a set of values of the dilation coefficient k in a determined domain, the measurement of a physical parameter then being determined by the dilation coefficient k for which the power or the amplitude of the signal gathered as echo is a maximum.

Abstract: A method of remotely interrogating a passive sensor, comprising at least one resonator, so as to determine the resonant frequency of said resonator, having a resonant frequency response defined by the design of said resonator, includes: a preliminary frequency-scan step for interrogating said resonator over a frequency range allowing for the rapid determination of a first resonant frequency (fr0) of said resonator by detecting the amplitude of the response signal of said resonator; a first step of a first couple of interrogations of said resonator at a first frequency (f11) and a second frequency (f21) such that: f11=fr0?fm/2 and f21=fr0+fm/2, fm being smaller than the width at half-maximum of the resonant frequency response defined by the design, allowing a first couple of amplitudes (Pf11, Pf21) of first and second reception signals to be defined; a second step of determining the amplitude difference (?(Pf11?Pf21)), said difference being signed; a third step allowing a first resonant frequency (fr1), contro

Abstract: The present invention relates to the field of acoustic wave devices, and particularly to that of transducers capable of operating at very high frequencies, from a few hundred MHz to several gigahertz, and its subject is more particularly an interface acoustic wave device including at least two substrates and a layer of ferroelectric material, the latter being contained between a first electrode and a second electrode and having first positive-polarization domains and second negative-polarization domains, the first and second domains being alternated, wherein the assembly constituted by the first electrode, the layer of ferroelectric material, and the second electrode is contained between a first substrate and a second substrate.

Abstract: The invention relates to a process for the collective fabrication of a remotely interrogable sensor having at least one first resonator and one second resonator. Each resonator exhibits respectively a first and a second operating frequency. A first series of first resonators are fabricated. The first resonators each have a first operating frequency belonging to a first set of frequencies centered on a first central frequency. A second series of second resonators are fabricated. The second resonators each having a second operating frequency belonging to a second set of frequencies centered on a second central frequency. A series of pairings of a first resonator and of a second resonator are conducted so as to form pairs of resonators exhibiting a difference of operating frequencies which is equal to the difference of the first and second central frequencies.