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Feedpoint for planar antenna

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aloishis89

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I designed an antenna using the antenna creator in HFSS that looks like this:
https://www.dropbox.com/s/waqh3wi3va6bpm1/antenna.pdf

I want to turn this into a PCB, but I'm a little confused on how I'll hook it up. Whenever I create a spiral antenna, it adds a large square in the middle. Is that whole surface the center of my coax, or are each of the two spirals the center of the coax and the middle is a ground plane?
 

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