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//Chapter 8: Helical Antennas
//Example 8-5.3
clc;
//Variable Initialization
n = 10.0 //Number of turns (unitless)
S = 0.236 //Spacing between turns (lambda)
n_a = 4.0 //Number of helical antennas in the array (unitless)
//Calculation
D = 12*n*S //Directivity of a single antenna(unitless)
Ae = D/(4*%pi) //Effective aperture (lambda^2)
A = sqrt(Ae) //Area of square/spacing between helixes (lambda)
Ae_total = Ae*n_a //Total effective aperture (lambda^2)
D_array = (4*%pi*Ae_total) //Directivity of the array (unitless)
D_array_db = 10*log10(D_array) //Directivity of the array (dBi)
//Result
mprintf("The best spacing between the helixes is %.1f lambda",A)
mprintf("\nThe directivity of the array is %d or %.1f dBi",D_array,D_array_db)
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