Hello Rahul,
1. There are several options for creating complex-shaped objects. I suggest checking the FDTD product reference manual under Simulation objects > Structures for details.
2. Based on my understanding of your geometry, the Waveguide might be useful. Also, take a look at Tips for creating waveguide bends using the path object. You can easily create something like this:
3. The Planar solid is another option, though it may be less convenient in this case.
4. Additionally, you can be creative with polygon primitives. Check out Tips for creating spiral and helix geometries and Tips for creating a 3D contour path object for inspiration.
Best regards,
Kirill
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