[問題] 解波導管與天線的問題
在解波導管內電磁波問題時
我們是用無源Maxwell方程式去解
因為管子內部無電荷與電流
但是為什麼解天線問題時
是用有源Maxwell方程式去解
導致分析過程很複雜
天線外部空間不也是沒電荷與電流嗎
這兩種問題本質其實是一樣的
為什麼解法不一樣?
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