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    • 12. 发明授权
    • Saw channelized filters
    • 锯通道化过滤器
    • US4947073A
    • 1990-08-07
    • US152127
    • 1988-02-04
    • Robert B. StokesKuo-Hsiung YenKei-Fung Lau
    • Robert B. StokesKuo-Hsiung YenKei-Fung Lau
    • H03H9/70H03H9/72
    • H03H9/72
    • 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.
    • 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。
    • 13. 发明授权
    • Surface acoustic wave spectrum analyzer
    • 表面声波频谱分析仪
    • US4499393A
    • 1985-02-12
    • US580575
    • 1984-02-15
    • Robert B. StokesKuo-Hsiung YenKei-Fung LauReynold S. KagiwadaMichael J. Delaney
    • Robert B. StokesKuo-Hsiung YenKei-Fung LauReynold S. KagiwadaMichael J. Delaney
    • G01H3/04G01H3/08G01R23/02G01R23/16G01R23/17H03H9/145H03H9/64H03H9/25H01L41/08
    • G01R23/17H03H9/1455
    • A surface acoustic wave (SAW) device configured to operate as a spectrum analyzer, and having an array of input transducers disposed on a substrate in such positions as to produce a focused beam of acoustic energy at a focal arc, each position on the arc being representative of an input signal frequency. Output transducers produce electrical signals corresponding to the energy received at successive segments of the focal arc. The disclosed device includes various combinations of input transducer array improvements, some of which are to provide amplitude weighting of the input array, including aperture width weighting, capacitive weighting, resistive weighting, series-parallel weighting, and source withdrawal weighting. Another improvement in input array configuration eliminates close or overlapping electrodes of opposite polarities and thereby reduces parasitic capacitance and acoustic radiation between electrode elements. The use of curved input transducer fingers improves operation of the transducers as point sources. Other important improvements include the use of acoustic transducers before to transmit the focused output energy from the focal line to conventional output transducers, thereby improving frequency resolution, and the use of electromagnetic waveguides to transmit energy from output transducers located on the focal line.
    • 一种表面声波(SAW)装置,被配置为作为频谱分析仪进行操作,并且具有设置在基板上的输入换能器阵列,以便在聚焦弧处产生聚焦的能量束的位置,弧上的每个位置 代表输入信号频率。 输出换能器产生对应于在焦弧的连续段处接收的能量的电信号。 所公开的设备包括输入换能器阵列改进的各种组合,其中一些是提供输入阵列的幅度加权,包括孔径宽度加权,电容加权,电阻加权,串联并行加权和源提取加权。 输入阵列配置的另一改进消除了相反极性的紧密或重叠的电极,从而减小电极元件之间的寄生电容和声辐射。 使用弯曲的输入传感器手指改善了作为点源的换能器的操作。 其他重要的改进包括在将聚焦输出能量从焦线传输到常规输出换能器之前使用声换能器,从而提高频率分辨率,以及使用电磁波导从位于焦线上的输出换能器传输能量。