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// Example 4.3
// To find a)power at receiver b)magnitude of E-field at receiver c)rms voltage applied to receiver input
// Page no. 112
clc;
clear all;
// Given data
Pt=50; // Transmitter power in Watt
fc=900*10^6; // Carrier frequency in Hz
Gt=1; // Transmitter antenna gain
Gr=2; // Receiver antenna gain
Rant=50; // Receiver antenna resistance in ohm
// a)Power at receiver
d=10*10^3; // Distance from antenna in meter
lambda=(3*10^8)/fc; // Carrier wavelength in meter
Prd1=10*log10((Pt*Gt*Gr*lambda^2)/((4*%pi)^2*d^2)); // Power at transmitter in dBW
Prd=10*log10(((Pt*Gt*Gr*lambda^2)/((4*%pi)^2*d^2))/(10^-3)); // Power at transmitter in dBm
// Displaying the result in command window
printf('\n Power at receiver = %0.1f dBW',Prd1);
printf('\n Power at receiver = %0.1f dBm',Prd);
// b)Magnitude of E-field at receiver
Ae=(Gr*lambda^2)/(4*%pi); // Aperture gain
Pr=10^(Prd1/10); // Receiver power in W
E=sqrt((Pr*120*%pi)/Ae); // Magnitude of E-field at receiver
// Displaying the result in command window
printf('\n \n Magnitude of E-field at receiver = %0.4f V/m',E);
// c)rms voltage applied to receiver input
Vant=sqrt(Pr*4*Rant)*10^3; // rms voltage applied to receiver input
//Answer is varrying due to round-off error
//Displaying the result in command window
printf('\n \n RMS voltage applied to receiver input = %0.3f mV',Vant);
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