can a wave be polerized RHCP and LHCP at the same time?

In principle yes, it all depends on the way you look at it.
You can represent an right hand or left hand circularly polarized wave by a superposition of two orthogonal linear states with some phase shift.
Conversely you can represent a linear wave as a superposition of RHCP and LHCP states. It's simply a different orthogonal basis.
See the wikipedia page on the subject for a mathematical description: http://en.wikipedia.org/wiki/Circula...al_description