電磁場(chǎng)葉老師第九章高頻電磁波

9.1.1 微 紫外 γ射

10-

10-

10-

10-

10-

9.

22 E D=22

D=e0E+ cE cE'm

2222

E D

g=Ae-B/cw

·H=gE+jweE=jwecE;ec=e-jg/或

w

m

1

=——E

w2t

j E

g=ne

'-

w2w0

1+=ne2/——

w2t

j '-

1+——

w2 we=e1- w

eff- w 0 w'-

eff- E+wmecE= E=E0x,yZz

H+

2

c H=c x,y?+ x,y

x,y?0 0

0

研究電磁波沿方向配等方式問題（包含了

E0x,y2

=

TE0x,y+K

x=K2 c=w2mec+K2E=9.2.1 0x,yE=9.2.1 0x,yZ2E+w2meE=

x,y +

() E0

E0

E0

x,yez

=T,y)+E0z,?zc,z+,cz

2= + +? ?y ?

?=T+?z?

=2 2

T

e

x, x,

z2 2 () 2

T x?T x?y+A-c

z=

+w

x

x,

x,y+w ( +GEx,y=( G22Tx,y+ 02cx,y=

+A-

c

= xZz0 0 x,y?+ x,0 0

x,y?0

E(x,y,=E0,

·H=jwec

wmy,=H0,

·E=- 0=-1jwmK 2+G 0z jwmK-G 2 0z=1K 2jwec 0z-G 0z=-1jweK c+G0zT·ETx,y,z=-jwmHx,y,z T·HT,y,=jweEz,y,?

cccc(a)

xEvz xEvz xvzH

xEvzxEvzxE -1

jwmKc2 Kc

+G 0zc G=jwmec

1

jwm

-G 0z

K2

(a) · ETx,y,z=-jwm

zx,y,ze

T·ETx,y,z)=· HTx,y,z=jwEzx,y,ze

T·HTx,y,z=可能TEM波。但是反過來(lái)就未必，因?yàn)槟苄纬伸o電場(chǎng)的電磁裝置也可以傳 G

G=jwmec G

c=,

?zx,jwm

E0x,=-

?zx, 0x=

0y=

=jwm

jwc m m 。ZZ=mecZZ=Gjwec

K2 K2

xxvzH(b)ZZjwmG

K2 K2y

(c)

vxExE Ex,y,

(E0x,y(

z=x,y2E0, sinwtEx, vvp=dz=b21+ E1E2

2E0wDwtb?2E0wDwtb?E=E1+2E0wtz+w?2E0sinwtbw= wzcosDwze?yE=E1+2E0wtz+w?2E0sinwtbw= 2E0sinwt-wt-Dbze?yEEA=2E0cosDt-z g1p g1p Dwt-Dbz= vb=

Dbdbdb vp

+vg

dvp10.20-----

t1t2z

1E0-0--1z-z

1EE0-

t1t2

EtEt

- --

t1tG=G=K2-w2me=a+ccz-z

0

GG=K2-w2me=a+ccG=G=jwmec=a+c在導(dǎo)電媒質(zhì) =1-j/w)we

2 we

meme21+we-

bwb

1

21+21+wem0

vp 0

1

=3·108m/

K2 K2

-w2

l=v