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# Design of dielectric lens using User Functions

This document shows an example of how to use the user functions. This specific case has been detailed the process to design a circular dielectric lens with newFASANT. The antenna will be made as the combination of conical horn, corrected by dielectric lens plugged over its aperture.

``````double getLensThickness2(double step) {
// Find the distance of phase2
// Phase = (distance / lambda) * 2 * PI
double z0 = 0.0562;          //Distance of initialPhase1
double zPlane = 1;           //ZPosition of Observation Plane
double freq = 8E9;           //Frequency in Hz
double epsReal = 2.7;        //Dielectric constant
double lambda = 3E8 / freq;  //Lambda_0
double lambdaMaterial = (lambda / Math.sqrt(epsReal)); //Lambda_m
double initialThickness = 0.02;
double minimumThickness = 0.005;
double error = 1E-6;
// Calculate Initial Phase
double initialPhase1 = (z0 / lambda) * 2 * Math.PI;
double initialPhase2 = (initialThickness / lambdaMaterial) * 2 * Math.PI;
double initialPhase3 = ((zPlane - initialThickness - z0) / lambda) * 2 * Math.PI;
double initialPhaseTotal = initialPhase1 + initialPhase2 + 	initialPhase3;
// Calculate Initial Thickness
double phase1 = (Math.sqrt(Math.pow(z0,2)+Math.pow(step,2)) / lambda) * 2 * Math.PI;
double phase3 = initialPhase3;
double phase2 = initialPhaseTotal - phase3 - phase1;
double thickness = lambdaMaterial * (phase2 / (2*Math.PI));
// Find the correct thickness
double diff = Double.MAX_VALUE;
while (Math.abs(diff)>error) {
phase3 = ((zPlane - thickness - z0) / lambda) * 2 * Math.PI;
phase2 = (thickness/lambdaMaterial) * 2 * Math.PI;
diff = initialPhaseTotal - (phase1 + phase2 + phase3);
thickness = thickness + lambdaMaterial * diff / (2 * Math.PI);
if (thickness < minimumThickness) {
thickness += lambdaMaterial;
initialPhaseTotal += 2*Math.PI;
}
}
return thickness;
}``````

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