In electrodynamics elliptical polarization
is the polarization
of electromagnetic radiation
such that the tip of the electric field
vector describes an ellipse
in any fixed plane intersecting, and normal
to, the direction of propagation. An elliptically polarized wave may be resolved into two linearly polarized waves in phase quadrature
with their polarization planes at right angles to each other.
All forms of polarization can be considered elliptical, including circular and linear polarization.