Acoustic reflector of baw resonator
    1.
    发明专利

    公开(公告)号:JP2004159339A

    公开(公告)日:2004-06-03

    申请号:JP2003377295

    申请日:2003-11-06

    CPC classification number: H03H9/175

    Abstract: PROBLEM TO BE SOLVED: To provide a BAW (bulk acoustic wave) resonator which has a plurality of layers to increase the function of the resonator.
    SOLUTION: The BAW resonator includes a piezoelectric layer 102, a first electrode 104 on a front surface, a second electrode 106 on the opposite surface, a substrate 108, and an acoustic reflector 110 provided between the substrate 108 and the second electrode 106. The acoustic reflector 110 has a plurality of alternately-arranged layers made of a material having a high acoustic impedance and made of a material having a low acoustic impedance. The function of the acoustic reflector 110 is determined by the reflectivity of longitudinal wave and the reflectivity of traverse wave which exist in the BAW resonator 100 with a resonant frequency of the BAW resonator 100. The acoustic reflector 110 and layers 106a and 106b provided between the acoustic reflector 110 and the piezoelectric layer 102 are chosen so that transmittance of the longitudinal wave and transmittance of the traverse wave at the resonant frequencyare less than -10dB, referring to the number of these layers, the material and thickness thereof.
    COPYRIGHT: (C)2004,JPO

    Bulk acoustic wave filter and method for eliminating unwanted side passbands
    2.
    发明专利
    Bulk acoustic wave filter and method for eliminating unwanted side passbands 有权
    大容量声波滤波器和消除无人机侧通道的方法

    公开(公告)号:JP2005260964A

    公开(公告)日:2005-09-22

    申请号:JP2005066389

    申请日:2005-03-09

    CPC classification number: H03H9/564 H03H9/02118

    Abstract: PROBLEM TO BE SOLVED: To provide a bulk acoustic wave filter having a suppressed side passbands particularly inside an attenuation band.
    SOLUTION: A bulk acoustic wave (BAW) filter (40) is manufactured from thin film bulk acoustic wave resonators. This BAW filter comprises a substrate (14), a resonator section (11) and an acoustic mirror section (12). Further it comprises a detuning component (31) positioned in the resonator section (11) to provide precise passband characteristics and an additional detuning component (41) in the acoustic mirror section (12) to suppress unwanted side-passband characteristics.
    COPYRIGHT: (C)2005,JPO&NCIPI

    Abstract translation: 要解决的问题:提供具有抑制的侧通带的体声波滤波器,特别是在衰减频带内。 解决方案:由薄膜体声波谐振器制造体声波(BAW)滤波器(40)。 该BAW滤波器包括衬底(14),谐振器部分(11)和声镜部分(12)。 此外,它包括位于谐振器部分(11)中以提供精确通带特性的失谐部件(31)和在声镜部分(12)中的附加失谐部件(41),以抑制不需要的侧通带特性。 版权所有(C)2005,JPO&NCIPI

    PROCEDIMIENTO PARA LA FORMACION CAPACITIVA DE IMAGENES.

    公开(公告)号:MXPA01001551A

    公开(公告)日:2005-06-20

    申请号:MXPA01001551

    申请日:1999-08-12

    Abstract: Un sistema en forma de red de superficies conductoras se utiliza para la formacion capacitiva de imagenes, en el cual entre los conductores (2) provistos para la medicion se utilizan conductores de apantallamiento (8). Durante varios ciclos de carga y descarga se conduce el potencial a cada uno de los conductores pertenecientes a un punto de la imagen, para evitar las corrientes de desplazamiento entre los condensadores de apantallamiento. Para la modificacion homogenea de los potenciales electricos en esos conductores puede por ejemplo utilizarse un conducto de compensacion con un amplificador operacional (9,10) retroacoplado.

    10.
    发明专利
    未知

    公开(公告)号:DE50202672D1

    公开(公告)日:2005-05-04

    申请号:DE50202672

    申请日:2002-11-22

    Abstract: In a method for manufacturing a piezoelectric oscillating circuit in thin film technology, wherein the oscillating circuit includes a predetermined natural frequency and a plurality of layers, first of all at least a first layer of the piezoelectric oscillating circuit is generated. Subsequently, by processing the first layer a frequency correction is performed. Subsequently, at least a second layer of the piezoelectric oscillating circuit is generated and processed for performing a second frequency correction.

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