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Question on GR900 calibration standards

Question asked by rf_user001 on Feb 3, 2016
Hello experts, 

I came across old GR900 calibration standards and I have a question in this regard. These standards have different models in terms of "support plane". For example, "short" comes as   "Precision Short-Circuit without support plane at 4 cm" and " Precision Short-Circuit without support plane at 0.00 cm".

Can you, please, explain what does "support plane" mean and what effect does it have on calibration standards RF performance?

Thank you!  

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