A plane wave is characterized by→⋅⋅ E = (0.5

1. Linearly polarized
2. Circularly polarized
3. Elliptically polarized
4. Unpolarized

Elliptically polarized as X and Y components have different magnitudes and are not in same phase.

→		⋅	⋅
E =	(0.5	x +	y	E^jπ/2)	e^{jωt– jkz}