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两个常被参考的特性阻抗公式： 微带线(microstrip) Z={87/[sqrt(Er+1.41)]}ln[5.98H/(0.8W+T)] 其中，W 为线宽，T 为走线的铜皮厚度，H 为走线到参考平面的距离，Er 是 PCB 板材质的介电常数(dielectric constant)。此公式必须在0.1
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:Base CITSZCalc.hlp>Main 1 Introduction to Controlled Impedance PCBs 2 Controlled impedance=Controlledimpedance@CITSZCalc.hlp>Main 2 Impedance matching=Impedancematching@CITSZCalc.hlp>Main 2 Calcu
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