Characteristic Impedance

Japanese: 特性インピーダンス - とくせいインピーダンス
Characteristic Impedance
A constant inherent to a transmission line. The amplitude of the voltage and current in an infinite line decreases as you move away from the sending end, but the amplitude ratio of the two is constant anywhere on the line. This ratio is called the characteristic impedance. If the end of the line is connected to a load with an impedance equal to the characteristic impedance, no reflected waves are generated.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
伝送線路に固有な定数。無限線路の電圧,電流は送端から遠ざかるに従って振幅を減少するが,両者の振幅比は線路上どこでも一定。この比を特性インピーダンスという。線路の終端を特性インピーダンスに等しいインピーダンスの負荷をつなぐと,反射波を生じない。

出典 株式会社平凡社百科事典マイペディアについて 情報

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