        AN-SOF ANTENNA SIMULATOR
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Frequency sweep simulation of a lossy transmission line.

The transmission line is made of one horizontal conductor above a perfect ground plane. A voltage source is placed at one line end and the other end is short-circuited against ground. The horizontal conductor has a finite resistivity of 0.01 Ohm meters, so a loss of power occurs along the line.

By plotting the input impedance as a function of frequency the resonance frequencies can be obtained (imaginary part of input impedance goes to zero), which are offset from the lossless line. The current distribution along the line can also be plotted to see the effect of power losses.