Function:

${\displaystyle I_{\alpha }=I_{0}{\frac {\sin ^{2}(\pi \cdot d\cdot \sin \alpha \cdot \lambda ^{-1})}{(\pi \cdot d\cdot \sin \alpha \cdot \lambda ^{-1})^{2}}}{\frac {\sin ^{2}(N\cdot \pi \cdot g\cdot \sin \alpha \cdot \lambda ^{-1})}{\sin ^{2}(\pi \cdot g\cdot \sin \alpha \cdot \lambda ^{-1})}}}$

with:

d:=1*10^(-7)m (gap width)

g:=2*10^(-6)m (gab distance)