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if the thickness of your wires are neglible compared tot he wavelength then i would say it is better to use ansoft designer.since the neglible thickness would make it a line and can be considered as 2-D.
if i am wrong with my assumption let me know.i can clarify a lil further
yes sheeta are a perfect way to be excuted in desinger using method of moments and moreover u can draw it on desinger and export it to HFSS using the option LAYOUT---> export to HFSS. it creates a VB file and then u can run it on hfss.