推 akisora:我猜..P向量=Re[E外積H*] 形成駐波能量就不會出去 11/30 22:20
推 popintaco:樓上正解 你先假設一個E場行進波 再用旋度方程求出H場 11/30 23:07
→ popintaco:Pav=1/2Re{E cross H* } 就可以看出K值是純虛數時候 11/30 23:09
→ popintaco:總能量=0 11/30 23:09
→ shareing:感謝各位解答 11/30 23:22
第6題
http://www.lib.nthu.edu.tw/library/department/ref/exam/eecs/el/97/5004.pdf
The mathematical expression for plane waves was well-known to you.
Please verify the net energy transmission(or flow) of the above-mentioned
plane wave is zero along the direction where the component of its propagation
vector is pure imaginary.
好像是問說行進常數為純虛數的話
證明它的總能量流為零
不知道有沒有看錯題目意思
不太懂為什麼總能量流會等於零
希望有人能開示我一下
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※ 編輯: shareing 來自: 220.141.8.139 (11/30 21:21)