ifft in VNA

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AK
AK 2012-3-9
Sir, I have a bandpass complex data spectrum in 2-20 GHz obtained from Vector Network Analyser i need to take its inverse Fourier Transform how to follow in such a bandpass case. I have worked it out for lowpass case where i took the negative frequencies to be the complex conjugate of the positive and then make a vector containing the both hence the results were found correct but in Bandpass case they are not coming like this please help

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