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TRL calibration in Pozar's book

Question asked by nauticawh on Jul 25, 2011
Latest reply on Jan 10, 2012 by Dr_joel
I notice that TRL calibration in David M. Pozar's book Microwave Engineering page  193 (3rd edition) has a different description. It says "It is not necessary to know the length of the line and it is not required that the line be lossless...". However, in Agilent TRL appnotes have already stated that we must know the characteristics of the standards Thru, Reflect and Line.

Can someone explain on this issue?

Thanks a lot.