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S11 with external amplifier

Question asked by GiJoe on Dec 15, 2009
Latest reply on Dec 17, 2009 by daras
All,

I am using an E8364B PNA to make an S11 measurement with an external amplifier attached in series to port 1.  The amplifier seems to isolate the reflected signal, so I used a directional coupler connected in series an after the amplifier to run an S21 measurement Iinstead.  I am making use of the IFFT to view the reflected/transmitted signal in the time domain.  I am using an antenna as the load and use a target at various distances from the antenna to see the changes in the reflection/transmission loss signal.  The S11 measurement works as expected when I don't use the amplifier. 
QUESTION:  HOW TO SET UP AN S11 MEASUREMENT WHILE CONNECTING AN AMPLIFIER IN SERIES TO PORT 1?

The idea is to detect the distance to a move and stop target, any suggestions are appreciated.

Joe  

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