Fig 4.6: Rectangular Horn antenna Consider a rectangular horn as in figure 4.6(b). from figure L θ cos  L  δ a θ sin   2  L δ a θ tan  2L Where L= length of the horn side length=L+δ A=Aperture angle θ=Flare From the geometry, we have also that a δ  2   L L 8δ and 2 cos   2 tan θ a L  L 2L δ Optimum horn dimensions 0 δ L   L optimum δ cosθ / 2 cosθ / 2   L optimum length δ 0 cosθ / 2
Fig 4.6: Rectangular Horn antenna Consider a rectangular horn as in figure 4.6(b). from figure cos θ  L L  δ sin θ  a 2 L  δ  tan θ  a 2L Where L= length of the horn side length=L+δ A=Aperture θ=Flare angle From the geometry, we have also that L  a 2 δ  L  8δ and θ  2 tan a  2 cos L 2L L  δ Optimum horn dimensions δ 0  L L  optimum δ cosθ / 2 L  δ 0 cosθ / 2  optimum length cosθ / 2
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