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De-embedding setup questions

Question asked by circulator on May 2, 2012
Latest reply on May 3, 2012 by circulator

I'm making 4-port measurements using an E5071B network analyzer and would like to understand how I can make the best measurements with the equipment I have.

My PCB is .030" Rogers 4350 with female SMA edge-launch connectors.  I'm measuring from 300 kHz to 8.5 GHz.  There is a single DUT at the end of four 50 Ohm transmission lines.

The first problem is that I'm using adapters for my cal kit.  I'm using a 85033E 3.5mm cal kit, and my test setup is using SMA connectors, so I've been instructed to use the male cal kit instead of the female to avoid damaging the female kit.  I've been using port rotation to remove the adapters, but I realize this could be adding errors to my setup.

My plan is to:

1. Calibrate the VNA using the adapters.
2. Use an unpopulated PCB and Open Auto Port Extension to de-embed the transmission lines.
3. Measure the DUT on another PCB.

I am hoping that the Auto Port Extension will reduce the effect of the adapters to a negligible amount.

Is this a reasonable plan for de-embedding?  How could it be improved?