1 P- R+ f2 J y0 y5 F; ^
! I- Y0 T9 p& _. P% q4 X, {求教大神FCC RF MPE评估的两套公式是否完全等价?但是把它们变形后发现结果相差1个数量级啊,还请大神能够帮忙看看,谢谢。A)E= √(30xPxG)/d and S=E2/377 4 E2 N0 k6 b' A
--> E= (30xPxG)/(377d2) --> E=0.0796xPxG/d2 Where E=Field strength in Volts/meter P=Power in Watts G =Numeric antenna gain d =Distance in meters S =Power density in milliwatts / square centimeter . [2 _* B5 Y z8 a
6 G$ |- G6 Y6 ^* d2 c: {+ C # r( v% f2 y$ k; Q+ r
- B) Friis transmission formula: Pd = (Pout*G)/(4* Pi * R2)
- --> Pd = 1000*P*G / 4*pi*10000 r2
- --> Pd = 0.00796 * P * G / r28 B4 N) j& G! E
Where Pd = power density inmW/cm2 Pout = output power toantenna in mW G = gain of antenna inlinear scale Pi = 3.1416 R = distance betweenobservation point and center of the radiator in cm $ l4 \& T1 M2 p# x$ i
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