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//Chapter 7: Loop, Slot and Horn Antennas
//Example 7-8.2
clc;
//Variable Initialization
Rr = 197.0 //Self resistance of loop (ohm)
Rm = 157.0 //Mutual resistance of two loops (ohm)
theta = 2*%pi/10 //Angle of radiation (radians)
//Calculation
D = 1.5*(2*sqrt(Rr/(Rr-Rm))*sin(theta))**2 //Directivity (unitless)
D_db = 10*log10(D) //Directivity (dBi)
//Result
mprintf("The directivity is %.1f or %.1f dBi",D,D_db)
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