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    • 6. 发明授权
    • Surface acoustic wave matched filter with dispersive substrate and saw group velocity based output electrode design
    • 表面声波匹配滤波器与分散基板和锯组速度输出电极设计
    • US06275123B1
    • 2001-08-14
    • US09351944
    • 1999-07-12
    • Mitsuhiro TanakaTomohiko ShibataYuji Hori
    • Mitsuhiro TanakaTomohiko ShibataYuji Hori
    • H03H964
    • H03H9/6416
    • A surface acoustic wave matched filter for use in a spread spectrum communication system is disclosed. The surface acoustic wave matched filter includes a substrate having dispersity and is composed of a sapphire main body and a piezoelectric aluminum nitride. A tap distance L of an output side electrode is designed on the basis of a group velocity vg instead of a phase velocity vs in order to match the tap distance L with an input spread spectrum signal and to improve a correlation peak level of an output demodulated signal. When the tap distance L is set to satisfy a condition of vg/f1×0.97≦L≦vg/f1×1.02, a decrease in the correlation peak level of the matched filter can be improved from 7 dB to a value smaller than 3 dB, and S/N of the output demodulated signal can be increased. Thus, the disclosed device renders it no longer necessary to process the output demodulated signal by a complicated and power consuming circuit.
    • 公开了一种用于扩频通信系统中的表面声波匹配滤波器。 声表面波匹配滤波器包括具有分散性并由蓝宝石主体和压电氮化铝构成的基板。 基于组速度vg而不是相位速度vs来设计输出侧电极的抽头距离L,以使抽头距离L与输入扩频信号相匹配,并且提高输出解调的相关峰值电平 信号。 当抽头距离L被设置为满足vg / f1x0.97 <= L <= vg / f1x1.02的条件时,匹配滤波器的相关峰值电平的降低可以从7dB提高到小于 3dB,可以提高输出解调信号的S / N。 因此,所公开的设备使其不再需要由复杂且耗电的电路来处理输出解调信号。