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解答02:Smith圓為什麼能“上感下容 左串右並”?
2022-06-23 17:26:00 【用戶9850660】
在《解答01:Smith圓為什麼能“上感下容 左串右並”?》中我們已經敘述反射系數的由來,進而對反射系數做歸一化,再到歸一化之後歸一化阻抗在複平面的圖形錶示。接下來我們將開始嘗試“掰彎”該圖形,並且研究“掰彎”之後的特性——
生活中有很多將立體形狀轉化為平面形狀的例子,
如將一個立體的柳丁子剝開並攤平,
如將地圖“掰彎”成為地球儀——
現在假設給你一個如下的臂力棒,
接下來,請你將該臂力棒“掰彎”——
複平面坐標與Smith圓圖都是二維平面,將複平面圖形中的線如同掰彎臂力棒一般操作,於是直線開始演化為曲線——
曲線演化成為閉合的圓線——
此時,我們已經將複平面的直角坐標圖變化為Smith圓圖,為了加深理解,有幾條典型的線需要再了解下
黑色的線上的阻抗,有個特點:實部為0;(電阻為0)紅色的線上的阻抗,有個特點:虛部為0;(電感、電容為0)藍色的線上的阻抗,有個特點:實部為1;(電阻為50歐姆)黃色的線上的阻抗,有個特點:虛部為-1;柳丁色的線上的阻抗,有個特點:虛部為1
轉化為Smith圓圖進行體現:
通過Smith圓圖,除了特殊的線,我們還可以簡單直觀地觀察部分區域,以如下兩個為例:
目前我們已經敘述了Smith圓圖的形成過程,並且稍微了解了典型的特性曲線、區域,
關於“上感下容,左串右並”的問題還差一個門檻, 篇幅所限,留待下一個篇章進行敘述。
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解答01:Smith圆为什么能“上感下容 左串右并”?
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