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// chapter 4 example 5
//-----------------------------------------------------------------------------
clc;
clear;
// given data
Pi = 5*10^-3; // Input power in W
CF = 10; // coupling factor
Piso = 10*10^-6 // power at isolated port in w
// calculations
// CF = 10log(Pi/Pc)
Pc = Pi/(10^(CF/10)) // antilog conversion and coupling power
// D = 10log(Pc/Piso) // Directivity
D = 10*log10(Pc/Piso)
// Output
mprintf('Directivity = %3.0f dB\n',D);
//------------------------------------------------------------------------------
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