r1 0.01[m] Waveguide radius
angle 29.5[deg] Flare angle
hl 0.1[m] Horn length
ht 0.005[m] Horn thickness
wl 0.03[m] Waveguide length
max_para r1+hl*sin(angle) Maximum lens curvature input parameter
hlens 0.0305[m] Lens curvature thickness