S參數(shù)問題

請教高手：hfss算S參數(shù)的時候，是根據(jù)輸入端口的電磁波的能量與輸出端口的電磁波的能量之間的某種比例關(guān)系來計算的嗎？還是根據(jù)相位關(guān)系算的？
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貼幫助文件中的幾段話，希望對你有幫助：
1.When solving for the S-parameters, HFSS assumes that the structure is excited by the natural field patterns (modes) associated with these cross-sections
2.Lumped ports compute S-parameters directly at the port.
3.HFSS solves in the frequency domain and obtains a phasor representation of the steady-state finite element field solution. Physical quantities such as the instantaneous (time domain) electric field are then obtained as derived quantities from the phasor representation
S參數(shù)用來描述端口間能量反射和傳輸特性
=[s][a],其中這里的元素都是復(fù)數(shù)，有幅度和相位，通常我們用dB作單位來得到s參數(shù)圖
其中，|bi|^2 是端口i的傳輸或反射功率，|ai|^2是端口i的入射功率，ai和bi的相位表示入射和反射/傳輸場在t＝0時的相位

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S參數(shù)是根據(jù)電壓關(guān)系算的，關(guān)于S參數(shù)問題，推薦樓主看看微波技術(shù)相關(guān)書籍

waveport和lumpport的s參數(shù)的定義是一樣的么?