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Reflection measurement with Z analyzer E4991A

Question asked by chstergiou on May 14, 2015
Latest reply on May 18, 2015 by helenpt
Hello,
I'm using a E4991A Z-analyzer with a 7mm port to measure the reflection coefficient S11 of a component with 7mm connector as well (1MHz-3GHz).

However, I have to extend the port with a coaxial cable.

Which of the described ways is the correct for calibration before measurement?

1. Calibrate the port (SOL). Connect the extension cable. Insert the delay time of the cable.
2. Connect the extension cable. Calibrate its end (SOL).
3. Connect the extension cable. Calibrate its end (SOL). Insert the delay time of the cable.

I've tried solution 2 with the original Agilent standards but S11>1 comes out in higher frequencies

Thank you.  

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