Khoa Ñieän ÑAÙP SOÁ THI CUOÁI KHOÙA MOÂN TRÖÔØNG ÑIEÄN TÖØ – DD11 (Ngaøy 25-12-2012)
BMCSKTÑieän ( Thôøi gian 110 phuùt , khoâng keå cheùp ñeà )
Baøi 1:
4
5
555
555
( )
5
( )
5
H()
( )
5
()
( )
5
rra
aarb
r
abr brc
r
abc cr
r
φ
<
<<
=+−
<<
+−
<
.
Baøi 2:
(a) m
E6; /6
π
ϕπ
==
(b) y
4
H(z,t) 0,1cos a (A/m)
36
tz
ππ
ω

=−+


GG
(c) 0,9425 W/m2.
Baøi 3:
(a) 0,126(1 j); 0,0444 45o
γη
=+=∠Ω
(b) αzjβzj/4
x
H45 a (A/m)ee e
π
−− −
=−
GG
?
(c) 29,2 W
Baøi 4:
Baøi 5:
(a) 21
0,6374 7,14 ; 0,6374 1053
oo
Γ= ∠− Γ= ∠−

(b) in
Z 153,3 44,3
o
=∠Ω
(c) 4,516
(d) 12
11, 42cos( 10 ) ; 11,7 cos( 166 )
oo
utVutV
ωω
=+=−
(e) 0,304 W
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Baøi 6:
(a) j8 sinθjβr
r
Eea (V/m)
π
θ
−
=
GG
(b) 42
15
u( , ) sin (W/sr)
π
θφ θ
=
(c) Pbx = 7,018 W (d) D = 1,5, <Pr>max = 8,4 nW/m2
Baøi 7:
(a) TE10 (5 GHz); TE01 (7,5 GHz); TE11/TM11 (9,01 GHz)
(b) β01 = 138,53 rad/m; η01 = 570 Ω; P = 0,0665 W
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