Hi nccu1990, Kaspalla,
Thanks for your answer. Actually I want only to focus on S11 parameters.
Kaspalla,
I cannot calibrate the VNA at power levels below -60dBm, the VNA returns an error mentionning that it cannot calculate the error cofficient for the reference load (open, short..). I assume this is due to the attenuation commutated inside the VNA for these levels.
nccu1990,
I will definitively saturate my DUT for power level around -20dBm, which can skew the S11 parameter measurement. Moreover, putting an attenuator between VNA input port and DUT will false the S11 calibration.
Any other suggestions.
regards,
Issam