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    Acoustic-wave transmitting system having curvilinear transducers
    2.
    发明授权
    Acoustic-wave transmitting system having curvilinear transducers 失效
    具有静电传感器的声波传输系统

    公开(公告)号：US3654574A

    公开(公告)日：1972-04-04

    申请号：US3654574D

    申请日：1970-08-18

    Applicant: ZENITH RADIO CORP

    Inventor： DIAS FLEMING

    IPC: H03H9/02 ,  H03H9/145 ,  H03H7/30 ,  H03H9/30

    CPC classification number: H03H9/02787 ,  H03H9/02881 ,  H03H9/14547 ,  H03H9/14561

    Abstract: The system comprises a substrate capable of propagating acoustic surface waves. Disposed near opposite ends of the substrate are an input transducer that responds to an input signal for launching acoustic surface waves and an output transducer that responds to those waves for developing an output signal which is fed to a load. Extending lengthwise down the center of the wavepropagating surface is an acoustic wave guide that concentrates acoustic surface waves along a propagation path between the two transducers. Each of the transducers includes a pair of interleaved combs of conductive electrodes coupled piezoelectrically to the substrate. Adjacent teeth in the combs are spaced apart by one-half the acoustic wavelength and are curved concavely toward the adjacent end of the strip.

    Abstract translation: 该系统包括能够传播声表面波的衬底。 设置在基板的相对端附近的是输入换能器，其响应用于发射声表面波的输入信号和响应于这些波的输出换能器，用于形成馈送到负载的输出信号。 沿波长传播表面的中心沿长度方向延伸的是声波引导，其将声表面波沿着两个换能器之间的传播路径集中。 每个换能器包括一对导电电极的交错梳，其压电地耦合到衬底。 梳子中相邻的齿隔开一半的声波长，并朝着条带的相邻端凹向弯曲。

    Acoustic surface wave filters
    3.
    发明授权
    Acoustic surface wave filters 失效
    声波表面波滤波器

    公开(公告)号：US3573673A

    公开(公告)日：1971-04-06

    申请号：US3573673D

    申请日：1969-01-08

    Applicant: ZENITH RADIO CORP

    Inventor： VRIES ADRIAN J DE ,  DIAS FLEMING ,  WOJCIK THOMAS J

    IPC: H03H9/00 ,  H03H9/02 ,  H03H9/64 ,  H03H9/20

    CPC classification number: H03H9/0038 ,  H03H9/0042 ,  H03H9/02622 ,  H03H9/02685 ,  H03H9/02842 ,  H03H9/02866 ,  H03H9/02874 ,  H03H9/64

    Abstract: A body of piezoelectric material is capable of propagating acoustic surface waves and a first transducing device is coupled to a surface of the body to develop those waves. Spaced on the same surface from that first device is a second transducing device. The spacing is sufficiently small that crosstalk exists between the devices. To reduce the magnitude of that crosstalk, one or more of several different decoupling arrangements are included. These comprise the connection of diametrically opposite transducer electrodes to a common plane of reference potential, the connection of the mutually closest electrodes of the respective transducers to a plane of common reference potential, the disposition of one or more ground electrodes between the transducers and across the path of wave propagation, the development across the transducers of signals balanced with respect to such a plane, the physical shielding of the space generally above one of the transducers, the inclusion of a conductive shield on the surface opposite the wave-propagating surface and the formation of shielding channels in that surface opposite the wave-propagating surface. In addition, the wave propagation path advantageously is caused to be oriented at an angle relative to the end surfaces of the piezoelectric body in order to minimize reflected wave interference.

    Acousto-electric signal translation system
    4.
    发明授权
    Acousto-electric signal translation system 失效
    ACOUSTO-ELECTRIC信号转换系统

    公开(公告)号：US3609602A

    公开(公告)日：1971-09-28

    申请号：US3609602D

    申请日：1968-03-04

    Applicant: ZENITH RADIO CORP

    Inventor： VRIES ADRIAN J DE ,  DIAS FLEMING

    IPC: H03H9/145 ,  H03H9/00

    CPC classification number: H03H9/02614

    Abstract: A body of piezoelectric material propagates acoustic surface waves. For launching or absorbing those waves, an electrode array is coupled to a surface portion of the body. The array includes a bifilar coil comprising a pair of windings coiled over the surface. A source or load is coupled between one end of one winding and the remote end of the other winding, with the remaining ends of both windings coupled together. The spacing between adjacent turns of the windings is effectively one-half the wavelength of the acoustic waves at the operating frequency. The bifilar winding is shown either in a form where it is coiled around a cylinder or where it is nested concentrically on a surface. In one species, an input transducer launches waves in two directions around a cylinder, and an output transducer absorbs waves coming from both of the two directions. The bifilar coil contributes an inductive reactance to compensate the clamped capacitance of the transducer.

    Surface-wave filter reflection cancellation
    7.
    发明授权
    Surface-wave filter reflection cancellation 失效

    公开(公告)号：US3596211A

    公开(公告)日：1971-07-27

    申请号：US3596211D

    申请日：1967-11-06

    Applicant: ZENITH RADIO CORP

    Inventor： DIAS FLEMING ,  VRIES ADRIAN J DE

    IPC: H03H9/02 ,  H03H9/145 ,  H03H9/00

    CPC classification number: H03H9/02842 ,  H03H9/14597

    Abstract: Undesired time-delayed and reduced-amplitude output signal components or ''''ghosts,'''' due to reflected surface waves arriving at the output transducer of an acousto-electric surface-wave filter, are inhibited or cancelled by providing an additional transducer suitably located to reflect compensating surface waves which arrive at either the input transducer or the output transducer in appropriate amplitude and phase to nullify the effect of the undesired surface waves. The amplitude of the compensating surface waves is controlled by the configuration of the additional transducer and the magnitude of its associated external load impedance.

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