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// chapter 7 example 2
//-----------------------------------------------------------------------------
clc;
clear;
// given data
Rr = 72; // Radiation resistance in ohms
Rl = 8; // Loss resistance in ohms
Ap = 27; // power gain
// Calculations
n = Rr/(Rr + Rl); // radiation efficiency
D = Ap/n; // Directivity
D_dB = 10*log10(D); // directivity in dB
// Output
mprintf('Directivity = %3.2f dB',D_dB );
//------------------------------------------------------------------------------
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