jvol jsurf hfss
1 - For a wire, draw a cylinder, and specify a radius. You can also use a rectangular sheet.
2 - For the boundary, create a flat square at the location of your inductor. make it as small as possible, and assign boundary (Lumped RLC)
3 - make your box or radiation boundary, change the material to your medium. after that, change boundary to radiation boundary.
4 - Current distribution - not sure about this, but you may have to use the field calculator.