Up to now you have probably simulated your circuits with ideal passive components
(inductors, capacitors, resistors), but real circuit components are far from ideal. Consider,
for instance, a capacitor, which has an equivalent circuit model shown in Fig. 2. The model
has many parasitic components which only become relevant at high frequencies. A plot of
the impedance of the capacitor, shown in Fig. 3, shows that in addition to the ideal behavior,
the most notable difference is the self-resonance that occurs for any real capacitor. The selfresonance
is inevitable for any real capacitor due to the fact that as AC currents flow through
a capacitor, a magnetic field is also generated by the capacitor, which leads to inductance