7.
= (LlH) (LSH)
G =LlH -LSH
LSH- , LlH- . , :
G =20 lg rSH / rLH
rSH- , rLH- .
, ( 10), :
G =20 lg rSH / r
.
: r=6, rSH =40.
G =20 lg 40/ 6=16.5
= ( ):
G =20 lg rSH / r -10lg (R2+ r2SH) / (R2+ r2)
R- ( ), .. , (=).
R
R=0.06 (V/T)0.5
:
10003, 2. .
R=0.06 (V/T)0.5=0.06(1000/2) 0.5=1.34
(R2+ r2SH)= 1.342+402=1601.79
(R2+ r2)= 1.342+62=37.79
10lg(R2+ r2SH)/ (R2+ r2)=10lg1601.79/37.79=16.2
G =20 lg rSH / r -10lg (R2+ r2SH) / (R2+ r2)=16.5-16.2=0.3
, , .
(.. ), . , =0.5,
R=0.06 (V/T)0.5=0.06(1000/0.5) 0.5=2.68
(R2+ r2SH)= 2.682+402=1607.18
(R2+ r2)= 2.68 2+62=43.18
10lg(R2+ r2SH)/ (R2+ r2)=10lg1607.18/43.18=15.7
G =20 lg rSH / r -10lg (R2+ r2SH) / (R2+ r2)=16.5-15.7=0.8
G=20lg { rSH rLM / rSM rLH}+20lg (θ)-
-10lg {D(rSH) D(rLM)/ D(rSM) D(rLH)}+LR,
LR- , -6 -15( );
rSH- ;
rLM- ;
|
|
rSM- ;
rLH- .
(θ)-
(θ)= (θs) L(θH)/ L(θM) M(θL)
(θs)- θs
L(θH)- θH
L(θM)- θ
M(θL) - θL .
D(rSH)= R2+ r2SH
D(rLM)=R2+ r2LM
D(rSM)= R2+ r2SM
D(rLH)= R2+ r2LH
R=0.06 (V/T)0.5
:
(.. =1)
R=9.5
LR=-6
rSH =39
rLM =13.7
rSM=0.6
rLH=27.4
G=20lg { rSH rLM / rSM rLH}+20lg (θ)-
-10lg {D(rSH) D(rLM)/ D(rSM) D(rLH)}+LR=
20lg{39x13.7/0.6x27.4}-10lg{1611x277.5/90.61x841.1}-6=20lg32.5-10lg5.9-6=30.23-7.7-6=16.5