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2 port measurement of unequal Impedance

Question asked by paulh on Oct 23, 2011
Latest reply on Oct 26, 2011 by scottrf

I have a matching network that has a source impedance of 4 ohms and a terminating impedance of 50 ohms.
The circuit is basically a filter.

I can do a single port S11 measurement of the circuit if I cal the VNA for 50 Z and just terminate the source with
a 4z load. I am trying to figure out how can I look at the response or shape of the filter so I can be sure that it
rolls off at the desired frequency. My problem is that while one port of my circuit is 50 Z the other is 4 Z so I am
unsure how to handle the 4 Z from the perspective of doing a one port 2port cal.

I am using a HP8753A with a HP778D Directional Coupler

Any suggestions most welcome

Thanks Paul