Sm. Narayana et al., INTERPOLATION EXTRAPOLATION OF FREQUENCY-DOMAIN RESPONSES USING THE HILBERT TRANSFORM/, IEEE transactions on microwave theory and techniques, 44(10), 1996, pp. 1621-1627
The Hilbert transform relates the real and the imaginary parts of the
transfer function of a causal system. The objective of this paper is t
o illustrate how the Hilbert transform relationship can be utilized to
interpolate/extrapolate measured frequency domain responses of device
s, Sample numerical examples are presented to illustrate the efficacy
of this method.