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quasi-yagi antenna design in ADS-CPW fed

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aberforth

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Hello,
I am simulating a quasi-yagi cpw fed antenna on ADS. The results do not match with the results as given on the research paper. The research paper did that on HFSS. Can anyone help me in this problem? The points to note:

(1) I tried CPW feeding with P1 + and P2 & P3 -ve wrt P1. So the two right & left blocks are assumed to be ground.
(2) In the substrate stackup, should there be cover at the bottom or not? Or is the stackup correct?
 

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