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Measurement of passive DUT having separated ground plans

Question asked by hoanghai on Sep 3, 2010
Latest reply on Sep 7, 2010 by hoanghai
Hello,

I'm using PNA E8361A to do S-parameter measurement for a 2-port passive DUT. The ground planes for the 2 ports of this device are separated by a small capacitor (less than 1pF). The measurement results show some strange resonances at frequencies around 50 MHz, 150 MHz and 400 MHz. As what I understand the ground for the 2 ports of the PNA are connected together inside the PNA. Is there anyway to separate the ground of these 2 ports of the PNA to do this measurement? since I think this is the reason of some strange resonances in the measurement results.

Thanks,

Hai  

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