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//Chapter 9: Reflector Antennas
//Example 9-2.1
clc;
//Variable Initialization
P_transmit = 25000.0 //Power transmitted by station transmitter (W)
gain_dbi = 29.0 //Gain of array (dBi)
r = 7500e3 //Distance (m)
h = 250e3 //Height (m)
z = 377.0 //Intrinsic impedance of free space (ohm)
//Calculation
gain = 10**(gain_dbi/10) //Gain of array (unitless)
erp = gain*P_transmit //Effective radiated power (W)
p_area = erp/(2*%pi*r*h) //Power per unit area at distance r (W/m^2)
field_str = sqrt(p_area*z) //Field strength (mV/m)
//Result
disp(erp,"The effective radiated power in W")
mprintf("\nThe field strength at the distance r is %.3f V/m^2",field_str)
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