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2-port calibration for reference planes separated far apart

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oac

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Hi all,

I need to perform a 2-port calibration of my network analyzer. The two ports (reference planes) are separated far apart (4.5m).

My initial thought is to perforn an unknown thru calibration; as here: https://ena.support.keysight.com/e5...ced_calibrations/unknow_thru_calibiration.htm
According to this document, the electrical length of the thru should be known at an accuracy of ±1/4 of the wavelength.

Therefore, I can use just any another transmission line of adequate length as unknown thru, provided I know the electrical length. Will this work and be accurate ? In your experience, would there be better ways to calibrate this two-port ?

Greetings and thanks in advance,
oac
 

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