This Windows program plots S-parameters for one or two Touchstone files. It generates rectangular plots as well as impedance, admittance, and immittance Smith charts. It displays wrapped or unwrapped phase, filtered or unfiltered group delay, file comments, and file data. It plots Z, L, Q, C, DF, and ESR using the S11 reflection, S21 or Y21 series-through, and S21 shunt-through methods.
The program can renormalize the reference impedance. This lets you measure a device at 50 ohms and plot the response at its design impedance. No matching network is needed. The plot compares insertion loss for two winding techniques for a 1:49 ferrite transformer, the kind used with an end-fed halfwave antenna. The port impedances differ. Port 1 includes shunt capacitance.
Two grid colors help clarify the immittance plot.
Magnify.
Unwrap crystal filter phase.
88–108 MHz