Time Domain, Option 2 8-3 VNA Master Implementation
Vector Network Analyzer MG PN: 10580-00289 Rev. K 8-13
Phasor Impulse
Impedance discontinuities are more difficult to analyze in the time domain with bandpass
processing because the phase of the discontinuity cannot easily be extrapolated to DC. A
technique called phasor impulse allows you to determine whether a mismatch is caused by a
low impedance line or a high impedance line by using a special technique to “unwrap” the
phase by using the peak reflection as the starting point. Phasor impulse is available in the
Bandpass Mode menu. The graph in the lower-left corner of Figure 8-11 uses phasor impulse
to reveal a low impedance mismatch in a waveguide measurement.
Figure 8-11. Phasor Impulse Revealing a Low Impedance Mismatch
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