Free Space Calibration Procedure
I am trying to do some free space calibration to extract material data from unknown arbitrary material. I am struggling with the calibration part as the s parameters i am getting is not good enough to get proper value. Can anybody please suggest the calibration procedure?
I have E8361 keysight VNA. I have Type N short, open, load, through (50ohm) but no standard precise calkit. What should I do?
I would recommend that you perform a free space TRL calibration. The through is simply the distance between the two ports (antennas) without any sample. Reflect is a reflective plate in the sample holder. Line is the additional distance between the two ports depending on the measurement frequency - take the quarter wavelength of the mid-band frequency and move the second antenna by the corresponding length - example X-band - 9 GHz - 8 mm = line is through length + 8 mm.
Make sure you specify a sexless connector with a characteristic impedance of 377 Ohms.
Hope this helps.
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