help in drawing the attached schematic in hfss or cst

please help me in drawing planar waveguide with edges round in cst or hfss. I have shown the attachment schematic.

Please upload hfss or cst file if possible. Or guide me/

its very easy dear........first u make an rectangular waveguide of desired dimensions then select the edge of the waveguide and apply the chamfering by using tab chamfer and then this function will curved ur edges one by one after selecting and applying this function.......................after that u can make another similar waveguide with chamfered edges but with some smaal dimensions and intersect between these first one..then u get ur desired shape.......................

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