Parameter

Quantity

Feed location

F(0, −r_fsinθ˳, r_fcosθ˳)

Feed beam direction (FBD)

P˳(x˳, y˳, 0)

Element location

P(x_mn, y_mn, 0)

Location vector from feed to FBD

$r_o=F{P}_o$

Location vector from feed to the element

$r=FP$

Distance of element and FBD

$s=\left|P{P}_o\right|$