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公开(公告)号：FR3046090A1
公开(公告)日：2017-06-30
申请号：FR1563360
申请日：2015-12-28
Applicant: FREC'N'SYS , CENTRE NAT RECH SCIENT
Inventor： BALLANDRAS SYLVAIN , BARTASYTE AUSRINE , SALUT ROLAND
IPC: B06B1/06
Abstract: L'invention concerne un transducteur à ondes de volume guidées, comprenant une plaque de substrat (10) acoustique en matériau électriquement isolant et un réseau de sources d'excitation acoustique synchrones, le réseau comportant un premier peigne (20) et un deuxième peigne (30) comprenant chacun une pluralité de transducteurs élémentaires (21 ; 31), les transducteurs élémentaires du premier et du deuxième peigne étant inter-digités et rangés selon une direction (X) de propagation des ondes de volume guidées, les transducteurs élémentaires s'étendant chacun selon un axe transversal (Y). Un transducteur selon l'invention est caractérisé en ce que chaque transducteur élémentaire comprend une électrode inférieure (22a, 22b,... 22c ; 32a, 32b,..., 32c) conductrice positionnée sur le substrat, un barreau en matériau piézoélectrique (24a, 24b,..., 24c ; 34a, 34b,..., 34c) positionné sur l'électrode inférieure et une électrode supérieure conductrice (23a, 23b,..., 23c ; 33a, 33b,..., 33c) positionnée sur le barreau. Application par exemple à la réalisation de transducteurs acoustiques embarqués sans fil et sans source d'énergie embarquée.
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公开(公告)号：FR3030154A1
公开(公告)日：2016-06-17
申请号：FR1462182
申请日：2014-12-10
Applicant: SASU FREC'N'SYS
Inventor： DANIAU WILLIAM , LAROCHE THIERRY , BALLANDRAS SYLVAIN
Abstract: Dispositif de capteur à ondes élastiques de surface interrogeable à distance comprenant un résonateur composé d'un transducteur à peignes inter-digités et deux miroirs de Bragg disposés d'un côté et de l'autre du transducteur, le transducteur présentant une fréquence de synchronisme f1 et une bande interdite entre les fréquences f2 et f3 et les miroirs de Bragg présentant une bande interdite entre les fréquences f4 et f5, la fréquence f1 étant comprise dans la bande interdite f4-f5 des miroirs de Bragg, la bande interdite f2-f3 du transducteur étant située hors de la bande interdite f4-f5 des miroirs de Bragg, de façon que le capteur offre une réponse spectrale monomode.
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公开(公告)号：US20220170799A1
公开(公告)日：2022-06-02
申请号：US17441109
申请日：2020-03-19
Applicant: FREC'N'SYS
Inventor： Sylvain Ballandras , Julien Garcia
Abstract: An interrogation device for interrogating an acoustic wave sensor device comprises a transmission antenna; a reception antenna; and a processor configured for determining in-phase components I and quadrature components Q of a response signal received from the sensor in N consecutive frames of the response signal; determining moduli |Y| of the in-phase components I and quadrature components Q; determining a first norm M based on the moduli |Y|; determining a first weighting function W based on the first norm M and the moduli |Y|; determining in-phase components I and quadrature components Q of an N+1th frame of the response signal; determining moduli |Y| of in-phase components I and quadrature components Q of the N+1th frame; and applying the first weighting function W to the determined moduli |Y| of the response signal in the N+1th frame to obtain weighted moduli |Y|w of the response signal for the N+1th frame.
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公开(公告)号：US20210034935A1
公开(公告)日：2021-02-04
申请号：US16980324
申请日：2019-03-14
Applicant: FREC'N'SYS
Inventor： Sylvain Ballandras , Thierry LaRoche
IPC: G06K19/067 , H03H9/02
Abstract: A surface acoustic wave tag device is disclosed, comprising: an acoustic wave propagating substrate, at least one transducer structure comprising inter-digitated comb electrodes, and at least one reflecting means, the reflecting means comprising at least one reflector, wherein the acoustic wave propagation substrate is a composite substrate comprising a base substrate and a piezoelectric layer, wherein the crystallographic orientation of the piezoelectric layer with respect to the base substrate is such that the propagation of a shear wave inside the piezoelectric layer and in the direction of propagation corresponding to the acoustic wave is enabled. A physical quantity determining device and a fabrication method of such surface acoustic wave tag device are also disclosed.
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公开(公告)号：WO2021044031A1
公开(公告)日：2021-03-11
申请号：PCT/EP2020/074865
申请日：2020-09-04
Applicant: FREC'N'SYS , SOITEC
Inventor： BALLANDRAS, Sylvain , COURJON, Emilie , BERNARD, Florent , LAROCHE, Thierry , GARCIA, Julien
Abstract: The present invention relates to an acoustic wave sensor device, comprising an interdigitated transducer; a first reflection structure arranged on one side of the interdigitated transducer; a second reflection structure arranged on another side of the interdigitated transducer; a first resonance cavity comprising a first upper surface and formed between the interdigitated transducer and the first reflection structure; a second resonance cavity comprising a second upper surface and formed between the interdigitated transducer and the second reflection structure; and wherein the second upper surface comprises a physical and/or chemical modification as compared to the first upper surface.
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Patent Agency Ranking
公开(公告)号：WO2020200822A1
公开(公告)日：2020-10-08
申请号：PCT/EP2020/057666
申请日：2020-03-19
Applicant: FREC'N'SYS
Inventor： BALLANDRAS, Sylvain , LAROCHE, Thierry , GARCIA, Julien
Abstract: The present invention relates to a method of interrogating an acoustic wave sensor, compris- ing transmitting, by an interrogator, an interrogation radiofrequency signal to the acoustic wave sensor by means of a transmission antenna, receiving, by the interrogator, a response radiofrequency signal from the acoustic wave sensor by means of a reception antenna, and processing by a processing means of the interrogator the received response radiofrequency signal to obtain in-phase and quadrature components both in the time domain and the fre- quency domain, determining by the processing means perturbations of the obtained in-phase and quadrature components both in the time domain and the frequency domain and deter- mining by the processing means a value of a measurand based on the detected perturba- tions.
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公开(公告)号：WO2021053401A2
公开(公告)日：2021-03-25
申请号：PCT/IB2020/000784
申请日：2020-09-18
Applicant: FREC'N'SYS
Inventor： BALLANDRAS, Sylvain , COURJON, Emilie , BERNARD, Florent
Abstract: The invention relates to a transducer structure (100) for a surface acoustic device comprising a composite substrate comprising a piezoelectric layer (104), a pair of interdigitated comb electrodes (108, 110), comprising a plurality of electrode means (112_1, 112_2, 112_3, 112_4, 114_1, 114_2, 114_3, 114_4) with a pitch p satisfying the Bragg condition, wherein the inter-digitated comb electrodes (108, 110) are embedded in the piezoelectric layer (104) such that, in use, the excitation of a wave propagating mode in the volume of the electrode means is taking place and is the predominant propagating mode of the structure. The invention relates also to an acoustic wave device comprising at least one transducer structure as described above and to a method for fabricating said transducer structure. The invention relates also to the use of the frequency of the bulk wave propagating in the electrode means of said transducer structure in an acoustic wave device to generate contribution at high frequency, in particular above 3 GHz.
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公开(公告)号：WO2021044035A1
公开(公告)日：2021-03-11
申请号：PCT/EP2020/074871
申请日：2020-09-04
Applicant: FREC'N'SYS , SOITEC
Inventor： BALLANDRAS, Sylvain , COURJON, Emilie , BERNARD, Florent , LAROCHE, Thierry , GARCIA, Julien
Abstract: The present invention relates to an acoustic wave pressure sensor device configured to measure a pressure, comprising a substrate configured to bend when the pressure is applied to the substrate such that an area of a first kind of strain and an area of a second kind of strain are formed in the substrate; an interdigitated transducer formed over the substrate; a first Bragg mirror formed over the substrate and arranged on one side of the interdigitated transducer; a second Bragg mirror formed over the substrate and arranged on another side of the interdigitated transducer; a first resonance cavity formed between the interdigitated transducer and the first Bragg mirror; a second resonance cavity formed between the interdigitated transducer and the second Bragg mirror; and wherein the first resonance cavity is formed over the area of the first kind of strain and the second resonance cavity is formed over the area of the second kind of strain.
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公开(公告)号：WO2020021029A3
公开(公告)日：2020-01-30
申请号：PCT/EP2019/070082
申请日：2019-07-25
Applicant: FREC'N'SYS
Inventor： BALLANDRAS, Sylvain , LAROCHE, Thierry
Abstract: The invention relates to a coupled cavity filter structure, using a surface acoustic wave, in particular a guided surface acoustic wave, comprising an acoustic wave propagating substrate (102), at least one input transducer structure (112) and one output transducer structure (114), provided over the substrate (102), each comprising inter-digitated comb electrodes (124, 126), one reflecting structure (116), said reflecting structure (116) comprising at least one or more metallic strips (114), positioned at a distance and in between the input and output transducer structures (112, 114), in the direction of propagation of an acoustic wave, characterised in that the acoustic wave propagation substrate (102) is a composite substrate comprising a base substrate (106) and a piezoelectric layer (104).The invention relates also to a coupled cavity filter structure wherein the one reflecting structure (816) comprises a groove(822). The invention relates also to a SAW ladder filter device comprising at least two coupled cavity filter structures as described previously,wherein the at least two coupled cavity filter structures are positioned on a single line.
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公开(公告)号：US11848663B2
公开(公告)日：2023-12-19
申请号：US17263880
申请日：2019-07-25
Applicant: FREC'N'SYS
Inventor： Sylvain Ballandras , Thierry LaRoche
CPC classification number: H03H9/6483 , H03H9/02669 , H03H9/02724 , H03H9/02771 , H03H9/02905 , H03H9/6489
Abstract: A coupled cavity filter structure that uses a surface acoustic wave, in particular, a guided surface acoustic wave, comprises an acoustic wave propagating substrate, at least one input transducer structure and one output transducer structure, provided over the substrate, each comprising inter-digitated comb electrodes, at least one reflecting structure comprising at least one or more metallic strips positioned at a distance and in between the input and output transducer structures, in the direction of propagation of an acoustic wave. The acoustic wave propagating substrate is a composite substrate comprising a base substrate and a piezoelectric layer. In additional embodiments, a coupled cavity filter structure comprises a groove. In additional embodiments, a SAW ladder filter device comprises at least two coupled cavity filter structures as described herein, wherein the at least two coupled cavity filter structures are positioned on a single line.
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