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Power problem with channel measurment using S12 and S21

Question asked by on Dec 29, 2011
Latest reply on Dec 29, 2011 by Dr_joel

I tried to perform a channel measurement using a network analyzer E5071C and two identical antennas. If the antennas are separated to fulfill the far field condition, (in my calculation it is about 4m), the mesurement results of S12 and S21 are extremely small as shown in the below figure
The peak is only about -45 dB. If we use the Transform in Analysis to look at S12 and S21 in time domain, the magnitudes are below -90 dB. I wonder if the results are realistic and usable for other purposes?
Does anyone meet the same problem and have a solution or any comment for this issue?

Thanks and best regards

Viet Vu