Why is there a difference in the ADS layout and schematic simulation results?

Dalia_Hassan

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I am working on a rectifier using Schottky diode HSMS 2852 and a matching circuit. There is a difference between the layout and schematic results for S11 (between m9 vs m10 and m11 vs m12). How can I solve this problem to get better results?

I have used TML for the input port as mentioned @volker@muehlhaus in his posts. I also used TML for the output port.

I have attached the layout and substrate screenshots. Please have a look.

Thanks very much.
 

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