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How can I control the impedance of the spiral antenna?

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fan1200

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Dear all

I am a student and i am trying to design 2 arm archimedean spiral antenna@60GHz in HFSS 10.

however the simulation result of s11 can not be satisfied.In hfss design, i put lump port in center of spiral, between 2 spiral arms.I want to match it with coaxial 50 ohm.

so how can I control the impedance of the spiral antenna.(How to reduce that imaginer and decrease that real)

thank you for helping me...
Best regards
 

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