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Signal output for simulation and hardware testing are different, pls help!

Question asked by waikit on Jun 8, 2013
HI. I desiged my circuit using ADS 2008 and fabricated my PCB using the same specification ( etc substrate layer, thickness, permittivity) as  the software. Unfortunitely the signals (S-Parameter measuring terms)  turn out to be  different. What could be the possible reasons of the failure???  Your contribution will be greatly appreciated. 

Thanks  

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