→ iyenn:時變源,順序 求A->H->E 11/15 19:48
→ plumeshouse:I大抱歉 我比較笨不是很懂= = 11/15 20:00
An infinite time-harmonic surface current sheet with surface current density
-> ->
Js = ax Js e^(jwt) (A/m)
located on the z=0 plane. Find the electromagnetic wave it produces everywhere
in space.
(92交大電信)
ANS:
$=本質阻抗
z>0
-> ->
E = -ax $ (Js/2) e^(-jkz)
-> ->
H = -ay $ (Js/2) e^(-jkz)
z<0
-> ->
E = -ax $ (Js/2) e^(jkz)
-> ->
H = ay $ (Js/2) e^(jkz)
-----------------------------------------------
我想問說為什麼不可以用
-> ->
J=(sigma) * E
來決定E方向
也久是說E是+ax方向??
可以幫我解答一下嗎
頭腦轉不過來了
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