2-18 GHz Cavity Backed Archimedean Spiral Antenna, s11 not good

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ahsaan

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Hi
I have modeled a cavity backed two arm archimedean spiral antenna in HFSS, but I am not getting good s11 results. I am uploading the hfss file alongwith the s11 result , can you please identify and provide solution to the problem?

I believe I might have made some error in feeding the spiral arms, but I dont know it.
Thanks
 

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