Doubt in Antenna desiging in HFSS

i am designing a bowtie antenna in HFSS .In order to design a bowtie structure , I drawn the bowtie structure using "draw line" command .how can i change this structure to 2D i.e sheet so that i can assign material to that structure .

There are two possible ways to convert a 1D model to 2D model
1. Modeler >Surface>Move Face >Along the Normal or Along the vector
2. Modeler >Surface>Sweep Faces Along the Normal

I think any of two will work in your case