Help with network analyser

flyhigh said:

I am not quite sure for the particular NA you have, but for plane shifting only without de-embedding you can use electric delay to come to the reference you need. It is beneficial if you know your delay exactlly, but it is adjust easily so you can play a bit to get to the reference plain you need. Be carefull, if you introduce delay phi for S11, you should introduce 2*phi for S21!

FlyHigh

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flyhigh said:

Hi Element7k,

For the first questiion, yes, your formula is OK. The second one is a bit of a story. As with other things concerning NA you need a calibration. I assume that you have to eliminate the lengh of a cable. Do the usual callibration. Then attach the cable and leave the other end open. Look on the phase of S11. Adjust the electric delay until you get the phase of an ideal open (0deg). Your reference plane is then shifted to the end of the open cable. If the length of a cable is greater than wavelength you can account for that roughly and then fine-tune the delay. This can be scaled to the length of the same cable type and delay of any length be known, but you have to do it once on an open cable if you don't know Er of the cable.

FlyHigh

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