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Measurement and simulation in high frequency

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isla4018

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Hi,

I have simulated S parameters of a PCB board from 0-10 GHz in Ansys HFSS 13. The measurement data is agreeable with the simulation data up to 2 GHz. But after 2 GHz, measurement and simulation data are not that much close. I am assuming my simulation is correct. So can anyone please answer why the higher frequency affect the measurement? Or what may be the reason that simulation and measurement are not that much agreeable in high frequency?

Thanks
 

which type of devices ar u using to simulate ? blocs ?
 

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