[CST] How to generate Dual Polarized Plane Wave.

Dear Members

I am simulating a tag structure on a single sided substare. Plane wave excitation is used to see the refelected results at difference polarizations (Horizaontla and Vertical).
Now I would like to excite the antenna with a Dual Polarized Plane wave. How can i do that in CST MWS.Your assistance is needed.

Regards