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Freq=[10e6::1e6::75e6] + f9 {& o G7 S+ f U" A
b1=2e-5
8 z7 u5 Q7 m, p$ Y: Ob2=1.1e-10 5 w6 g( K+ Z( N/ W" w
b3=3.2e-20 g. w; V8 w! [
b4=1.2e-40
; m5 Q" m8 G8 [/ L4 ~+ C- j ce=2.71828 4 d9 ?- W" A( Z, a5 E" v# t
ILpcb(f)=0.3*[20*lg(e)*(b1*(power(f,1/2)+b2*(power(f,1)+b3*(power(f,2)+b4*(power(f,3)]
. b u1 h) V6 a2 T, R. v9 f
: U" b' H% j5 x' HA=12-2*POWER(f,1/2)
) d5 }2 \4 E* F$ }2 `; D4 JB=6.3-13*lg(f/5.5) ( A/ M& I/ y" [ h( c, \
RL=if(freq<4.1)then a else b 4 T$ a g3 Q# u7 j; d4 _& H: ?
; d* f& N+ b+ h( H% g: e8 q2 Y
4 G1 }# ?8 K, ~0 L) q* ]& b
可以参照这个写 |
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