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Time Domain, Option 2
8-3 VNA Master Implementation
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
Vector Network Analyzer MG
PN: 10580-00289 Rev. K
8-13
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