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    Shallow bulk acoustic wave devices
    2.
    发明授权
    Shallow bulk acoustic wave devices 失效
    浅体积声波装置

    公开(公告)号：US4349794A

    公开(公告)日：1982-09-14

    申请号：US954149

    申请日：1978-10-24

    申请人： Reynold S. Kagiwada ,  Kuo-Hsiung Yen ,  Ke-Li Wang ,  Kei F. Lau ,  Donald L. Lochhead ,  James A. Leaverton

    发明人： Reynold S. Kagiwada ,  Kuo-Hsiung Yen ,  Ke-Li Wang ,  Kei F. Lau ,  Donald L. Lochhead ,  James A. Leaverton

    IPC分类号： H03H9/02 ,  H03H9/15 ,  H03B5/32 ,  H03H9/36

    CPC分类号： H03H9/02795 ,  H03H9/02236 ,  H03H9/02653 ,  H03H9/027 ,  H03H9/02716

    摘要： Acoustic wave devices employing shallow bulk acoustic waves rather than surface acoustic waves, to provide higher frequencies of operation and other significant advantages, such as less susceptibility to aging and less sensitivity to surface contamination. In each embodiment of the invention, a transmitting transducer and a receiving transducer are oriented on the surface of an anisotropic piezoelectric crystal to achieve substantial coupling of shallow bulk acoustic waves and essentially zero coupling of surface acoustic waves. In one embodiment of the invention, various types of grating filters utilize shallow bulk acoustic waves, and a set of parallel mechanical or electrical discontinuities at or near the surface of the crystal provide reflection of acoustic energy at a frequency determined by the spacing of the discontinuities. Uniformly spaced gratings provide bandpass filter operation, and gratings with graduated spacings provide for frequency compression or expansion. In another embodiment of the invention, variations in device characteristics due to temperature changes are compensated for by directing the shallow bulk waves through materials having favorable or opposite temperature characteristics compared with those of the material into which the waves are originally launched. In other embodiments of the invention, a shallow bulk acoustic wave includes a multistrip coupler, for transferring electroacoustic energy from one propagation path to another, for use in bandpass filters, delay lines or unidirectional transducers.

    摘要翻译： 使用浅体积声波而不是表面声波的声波装置，以提供更高的操作频率和其他显着的优点，例如对老化的敏感性较低和对表面污染的敏感性较小。 在本发明的每个实施例中，发射换能器和接收换能器定向在各向异性压电晶体的表面上，以实现浅体积声波和表面声波的基本零耦合的实质耦合。 在本发明的一个实施例中，各种类型的光栅滤波器利用浅体积声波，并且在晶体表面处或附近的一组平行的机械或电气不连续性以由不连续部分的间隔确定的频率提供声能的反射 。 均匀间隔的光栅提供带通滤波器操作，具有刻度间距的光栅可用于频率压缩或扩展。 在本发明的另一个实施例中，由于温度变化引起的器件特性的变化是通过将浅体积波导入具有有利或相反温度特性的材料来补偿的，与材料相比，波浪最初被发射的材料。 在本发明的其他实施例中，浅体积声波包括用于将电声能从一个传播路径转移到另一传播路径的多带耦合器，用于带通滤波器，延迟线或单向换能器。

    Surface acoustic wave chirp filter
    4.
    发明授权
    Surface acoustic wave chirp filter 失效
    表面声波啁啾滤波器

    公开(公告)号：US5179309A

    公开(公告)日：1993-01-12

    申请号：US152203

    申请日：1988-02-04

    申请人： Robert B. Stokes ,  Kuo-Hsiung Yen ,  Jeffrey H. Elliott

    发明人： Robert B. Stokes ,  Kuo-Hsiung Yen ,  Jeffrey H. Elliott

    IPC分类号： H03H9/145 ,  H03H9/42

    CPC分类号： H03H9/72 ,  H03H9/14547 ,  H03H9/14555 ,  H03H9/14561 ,  H03H9/14564 ,  H03H9/44

    摘要： A surface acoustic wave (SAW) chirp signal processor having a piezoelectric substrate, an array of input transducers and an array of output transducers. In its chirp compression mode, the device has chirp signals applied in parallel to its input transducers and produces compressed output pulses at its output transducers, corresponding to selected chirp rates. The input transducers are successively offset with respect to a focal point on the array of output transducers, by distances that successively and linearly increase or decrease from transducer to transducer, consistent with the increase or decrease in the wavelength of the chirp signals. The device may also be used in a pulse expansion mode, by inputting a broadband pulse into a selected one of the output transducers. The input transducers then produce a chirp signal having a rate corresponding the selected to output transducer.

    摘要翻译： 具有压电衬底的表面声波（SAW）线性调频信号处理器，输入换能器阵列和输出换能器阵列。 在其啁啾压缩模式下，该装置具有与其输入换能器并联的啁啾信号，并在其输出的换能器处产生对应于所选啁啾率的压缩输出脉冲。 输入换能器相对于输出换能器阵列上的焦点，依据线性调频脉冲信号的波长的增加或减小，连续地从换能器到换能器逐渐增加或减少的距离偏移。 该装置还可以以脉冲扩展模式使用，通过将宽带脉冲输入到选定的一个输出换能器中。 然后，输入换能器产生具有对应于所选输出换能器的速率的啁啾信号。

    Magnetostatic wave channelizer
    5.
    发明授权
    Magnetostatic wave channelizer 失效
    静电波通道器

    公开(公告)号：US4716390A

    公开(公告)日：1987-12-29

    申请号：US907546

    申请日：1986-09-15

    申请人： Jeffrey H. Elliott ,  Robert B. Stokes ,  David Penunuri ,  Kuo-Hsiung Yen

    发明人： Jeffrey H. Elliott ,  Robert B. Stokes ,  David Penunuri ,  Kuo-Hsiung Yen

    IPC分类号： H03H2/00 ,  H01P1/20 ,  H01P1/213

    CPC分类号： H03H2/001

    摘要： A magnetostatic wave (MSW) device for performing spectral analysis of an input signal containing signal components of very high frequency, well in excess of 1 GHz (gigahertz). An input transducer array couples the input signal to a magnetostatic propagating medium, such as a film of yttrium-iron-garnet (YIG), in such a manner that the array effectively provides multiple wave sources spaced along a predetermined arc on the propagating medium, and the waves combine constructively at frequency-dependent points in a focal region of the medium, spaced apart from the input array. Output transducers located at these frequency-dependent points generate output signals indicative of various selected frequency components of the input signal.

    摘要翻译： 一种用于对含有超过1GHz（千兆赫兹）的非常高频率的信号分量的输入信号进行频谱分析的静磁波（MSW）装置。 输入传感器阵列将输入信号耦合到静磁传播介质，例如钇 - 铁 - 石榴石（YIG）的膜，使得阵列有效地提供沿着传播介质上的预定电弧间隔开的多个波源， 并且波形在介质的聚焦区域中的频率相关点处构造性地结合，与输入阵列间隔开。 位于这些频率相关点处的输出换能器产生指示输入信号的各种选定频率分量的输出信号。

    Surface acoustic wave filter with feedforward to reduce triple transit effects
    7.
    发明授权
    Surface acoustic wave filter with feedforward to reduce triple transit effects 失效
    表面声波滤波器具有前馈，减少三重转接效应

    公开(公告)号：US4237432A

    公开(公告)日：1980-12-02

    申请号：US17215

    申请日：1979-03-05

    申请人： Marshall Y. Huang ,  Albert J. Grote ,  Kuo-Hsiung Yen

    发明人： Marshall Y. Huang ,  Albert J. Grote ,  Kuo-Hsiung Yen

    IPC分类号： H03H9/02 ,  H03H9/64 ,  H03H9/25

    CPC分类号： H03H9/0285 ,  H03H9/0296

    摘要： A surface acoustic wave filter device having an input transducer and an output transducer, in which triple transit effects are minimized by the addition of a second output transducer spaced from the input transducer, preferably by a distance three times the spacing between the normal input and output transducers, to duplicate the triple transit path length. A triple transit signal is thereby simulated at the second output transducer, is adjusted in amplitude and phase, and is applied to a summing circuit in which the simulated triple transit signal is subtracted from a signal derived from the original output transducer, to effectively cancel the triple transit component.

    摘要翻译： 具有输入换能器和输出换能器的表面声波滤波器装置，其中通过添加与输入换能器间隔开的第二输出换能器来最小化三重转接效应，优选地距离正常输入和输出之间的距离的三倍 传感器，以复制三重传输路径长度。 在第二输出传感器上模拟三通道信号，在幅度和相位上进行调整，并将其应用于从源自原始输出换能器的信号中减去模拟三重转接信号的求和电路，以有效地消除 三重运输组件。

    Saw channelized filters
    9.
    发明授权
    Saw channelized filters 失效
    锯通道化过滤器

    公开(公告)号：US4947073A

    公开(公告)日：1990-08-07

    申请号：US152127

    申请日：1988-02-04

    申请人： Robert B. Stokes ,  Kuo-Hsiung Yen ,  Kei-Fung Lau

    发明人： Robert B. Stokes ,  Kuo-Hsiung Yen ,  Kei-Fung Lau

    IPC分类号： H03H9/70 ,  H03H9/72

    CPC分类号： H03H9/72

    摘要： A surface acoustic wave (SAW) device and a related method, for providing improved frequency response characteristics from a SAW spectrum analyzer or channelizer. The device includes a spectrum analyzer with a preprocessing SAW device configured to provide output signals with narrower passbands, lower sidelobe components, or both. The preprocessing SAW device is a tapped delay line in one embodiment, to simulate positional offsets in the placement of input transducers of the analyzer. The tapped delay line can also be used to provide amplitude weighting or can be configured in a chirp spacing, to transform the spectrum analyzer into a chirp analyzer. Another embodiment employs a thinned-electrode prefilter as the preprocessing device, to yield a frequency response with multiple narrow passbands, which are used to narrow the individual channel passbands of the spectrum analyzer or to suppress sidelobes in the frequency response.

    摘要翻译： 一种表面声波（SAW）器件和相关方法，用于从SAW频谱分析仪或通道化器提供改进的频率响应特性。 该装置包括具有预处理SAW器件的频谱分析器，其被配置为提供具有较窄通带，较低旁瓣分量或两者的输出信号。 在一个实施例中，预处理SAW器件是抽头延迟线，以模拟分析器的输入换能器的放置位置偏移。 抽头延迟线还可以用于提供幅度加权或者可以以啁啾间隔配置，以将频谱分析仪转换成啁啾分析仪。 另一实施例采用薄电极预滤器作为预处理装置，以产生具有多个窄通带的频率响应，其用于缩小频谱分析仪的各个通道通带或抑制频率响应中的旁瓣。

    Surface acoustic wave device for data rate reduction
    10.
    发明授权
    Surface acoustic wave device for data rate reduction 失效
    用于数据速率降低的表面声波装置

    公开(公告)号：US4672641A

    公开(公告)日：1987-06-09

    申请号：US615609

    申请日：1984-05-31

    申请人： Kuo-Hsiung Yen ,  Robert B. Stokes ,  Marshall Y. Huang

    发明人： Kuo-Hsiung Yen ,  Robert B. Stokes ,  Marshall Y. Huang

    IPC分类号： H04L27/18 ,  H04B1/66 ,  H04J3/18 ,  G01L3/02

    CPC分类号： H04J3/18 ,  H04B1/662

    摘要： A surface acoustic wave (SAW) device, and corresponding method, for expanding or contracting the time scale of an input signal that varies in time but is limited to a predetermined time interval. One embodiment of the invention achieves time expansion or compression by means of two Fourier transformations providing different chirp rates, and implemented in a form that includes only five SAW dispersive delay lines. In the illustrative version of this embodiment, three of the dispersive delay lines are used in conjunction with multipliers or mixers, and two are used as convolvers. Another embodiment of the invention uses only three SAW dispersive delay lines, two in conjunction with multipliers and one located between the multipliers to effect the desired time-scale change. A third embodiment of the invention employs a SAW tapped delay line and an associated set of gates to select successive data bit signals from successive output taps in the delay line. A SAW fill-in filter is used to fill in inter-bit gaps resulting from the use of the tapped delay line.

    摘要翻译： 一种表面声波（SAW）装置及相应的方法，用于扩展或缩小时间上变化但被限制在预定时间间隔的输入信号的时间标度。 本发明的一个实施例通过提供不同啁啾率的两个傅里叶变换实现时间扩展或压缩，并且以仅包括五个SAW色散延迟线的形式实现。 在该实施例的说明性版本中，三个色散延迟线与乘法器或混频器一起使用，两个用作卷积器。 本发明的另一实施例仅使用三个SAW色散延迟线，其中两个与乘法器结合，一个位于乘法器之间，以实现期望的时标变化。 本发明的第三实施例采用SAW抽头延迟线和相关联的一组门，以从延迟线中的连续输出抽头选择连续的数据位信号。 SAW填充滤波器用于填充由使用抽头延迟线导致的位间间隙。