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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
 

jallem

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Spiral antenna

The spiral antenna usually has an impedance to
about 150 to 200 Ohms. It is intrinsically that way.
Most people just design a matching network for
a 50 Ohm cable.
 

fan1200

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Re: Spiral antenna

Hello jallem

First Thank you for your reply.

I want to design a spiral antenna to operate as filter and antenna.(and the size of it is limited)so I can not use matching network.

Is there any way else to change its impedance ?

Thanks.
 

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