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How to feed spiral antenna in CST?

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suraya

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Hi,

I'm trying to simulate a 2-arm equiangular spiral antenna in CST.
I'm using coaxial feed to feed the antenna.
Anybody knows where i should place the feed?
Should it be in the middle of the spiral or on one of the arms?

Many thanks
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Dear Suraya,

feeding of spirals through coaxial cables is very tricky, as you need baluns (check Balanis book for that).
I would suggest you simulate first with a discrete port between the two arms of the spiral, in order to check the antenna behaviour and then study some proper way of feeding!
 

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