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determine physical offset length from reference plane

Question asked by labdevo on Aug 3, 2015
Latest reply on Apr 3, 2016 by cmains
Hello, 
I read the following online document and have a question about the physical offset length from reference plane.

http://cp.literature.agilent.com/litweb/pdf/5989-4840EN.pdf

I want to engineering coaxial solt calibration standards and I don't have an idea how to define the physical offset length from reference plane of the short and open. My frequency span is from 10 MHz to about 20 GHz and I want an return loss of about 40 dB in average over the span. It is posibble to calculate my length with the following formula: 

S11=-e^(-j*4*pi*l/lambda) with lambda= c/fcenter

If I calculate, I get a length of about 8.8 mm. Is it right how I am thinking? Or has anyone a hint to me how I can calculate the length l?

I would be grateful, if someone could help me.  

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