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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：US11894830B2
公开(公告)日：2024-02-06
申请号：US17418824
申请日：2019-12-27
Applicant: THALES , CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE , FREC'N'SYS , YNCREA HAUTS DE France ISEN LILLE , UNIVERSITE DE LILLE , ECOLE CENTRALE DE LILLE , UNIVERSITE POLYTECHNIQUE HAUTS-DE-FRANCE
Inventor： Thi Mai Pham Colomban , Claude Prévot , Paolo Martins , Anne-Christine Hladky-Hennion , Bertrand Dubus , Marianne Sagnard , Thierry Laroche , Sylvain Ballandras , Charles Croenne
CPC classification number: H03H9/14502 , H03H9/02637 , H03H9/02992 , H03H9/64
Abstract: A surface acoustic wave device includes at least one transducer; two acoustic reflectors disposed on either side of the at least one transducer so as to form a cavity, each acoustic reflector comprising an array of electrodes in the form of lines parallel with each other, each array comprising a subset of electrodes connected to a reference potential denoted mass defining a first connection type, and a subset of electrodes that are not connected to any potential, i.e. that have a floating connection defining a second connection type; at least one switching circuit configured to modify the distribution of the connections of at least one part of the electrodes of each array between the different connection types.
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公开(公告)号：US20220326102A1
公开(公告)日：2022-10-13
申请号：US17753510
申请日：2020-09-04
Applicant: FREC'N'SYS
Inventor： Sylvain Ballandras , Emilie Courjon , Florent Bernard , Thierry LaRoche , Julien Garcia
Abstract: An acoustic wave pressure sensor device configured to measure a pressure, comprising a substrate configured to bend when 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：US20210265980A1
公开(公告)日：2021-08-26
申请号：US17263880
申请日：2019-07-25
Applicant: FREC'N'SYS
Inventor： Sylvain Ballandras , Thierry LaRoche
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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Patent Agency Ranking
公开(公告)号：US20210021255A1
公开(公告)日：2021-01-21
申请号：US17043559
申请日：2019-03-14
Applicant: FREC'N'SYS
Inventor： Sylvain Ballandras , Thierry LaRoche
Abstract: A surface acoustic wave device comprising a base substrate, a piezoelectric layer and an electrode layer in between the piezoelectric layer and the base substrate, a comb electrode formed on the piezoelectric layer comprising a plurality of electrode means with a pitch p, defined asp=A, with A being the wavelength of the standing acoustic wave generated by applying opposite potentials to the electrode layer and comb electrode, wherein the piezoelectric layer comprises at least one region located in between the electrode means, in which at least one physical parameter is different compared to the region underneath the electrode means or fingers. A method of fabrication for such surface acoustic wave device is also disclosed. The physical parameter may be thickness, elasticity, doping concentration of Ti or number of protons obtained by proton exchange.
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公开(公告)号：US11828668B2
公开(公告)日：2023-11-28
申请号：US17753510
申请日：2020-09-04
Applicant: FREC'N'SYS
Inventor： Sylvain Ballandras , Emilie Courjon , Florent Bernard , Thierry LaRoche , Julien Garcia
CPC classification number: G01L9/0025 , G01L1/165 , G01L9/008
Abstract: An acoustic wave pressure sensor device configured to measure a pressure, comprising a substrate configured to bend when 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：US11606079B2
公开(公告)日：2023-03-14
申请号：US16980328
申请日：2019-03-14
Applicant: FREC'N'SYS
Inventor： Sylvain Ballandras , Florent Bernard , Emilie Courjon
Abstract: A transducer structure for a surface acoustic wave device, comprising a pair of inter-digitated comb electrodes, wherein the pair of inter-digitated comb electrodes comprises neighboring electrode means belonging to different comb electrodes and having a pitch p being defined as the edge-to-edge electrode means distance between two neighboring electrode means, the pitch p satisfying the Bragg condition; characterized in that the pair of inter-digitated comb electrodes comprises at least one region in which two or more neighboring electrode means belong to the same comb electrode while having an edge-to-edge distance to each other corresponding to the pitch p. The present disclosure relates also to a surface acoustic wave filter device.
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公开(公告)号：US20220407491A1
公开(公告)日：2022-12-22
申请号：US17753429
申请日：2020-09-18
Applicant: FREC'N'SYS
Inventor： Sylvain Ballandras , Emilie Courjon , Florent Bernard
Abstract: A transducer structure for a surface acoustic device comprises a composite substrate comprising a piezoelectric layer, a pair of inter-digitated comb electrodes, comprising a plurality of electrode means with a pitch p satisfying the Bragg condition, wherein the inter-digitated comb electrodes are embedded in the piezoelectric layer 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 present disclosure relates also to an acoustic wave device comprising at least one transducer structure as described above and to a method for fabricating the transducer structure. The present disclosure relates also to the use of the frequency of the bulk wave propagating in the electrode means of the 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：US20220173721A1
公开(公告)日：2022-06-02
申请号：US17599149
申请日：2020-03-19
Applicant: FREC'N'SYS
Inventor： Sylvain Ballandras , Thierry LaRoche , Julien Garcia
IPC: H03H9/64 , G01K11/26 , G06K19/067 , G01S13/75
Abstract: A method of interrogating an acoustic wave sensor comprises transmitting, by an interrogator, an interrogation radiofrequency signal to the acoustic wave sensor by way of a transmission antenna, receiving, by the interrogator, a response radiofrequency signal from the acoustic wave sensor by way 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 frequency 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 determining by the processing means a value of a measurand based on the detected perturbations.
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