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//Chapter-9 example 19
//=============================================================================
clc;
clear;
//input data
F = 8*10^9;//radar operating frequency in hz
Vo = 3*10^10;//velocity of EM wave in cm/s
D = 10;//pyramida horn diameter in cm
W = 5;//pyramida horn width in cm
//Calculations
lamda = Vo/F//wavelength in cm
Gp = (4.5*W*D)/(lamda*lamda);//power gain
G = 10*log10(Gp);//power gain in dB
Di =(7.5*W*D)/(lamda*lamda);//directivity
DI =10*log10(Di);//Directivity in dB
//Output
mprintf('Powergain is %3.2f dB\n Directivity is %3.2f dB',G,DI);
//=============end of the program==============================================
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