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A negative inductor is a capacitor whose impedance increases with
increasing frequency. This is potentially a useful element for modeling bizarre impedances.
A traditional Hartley oscillator’s resonant circuit consists of a tapped inductor and resonating capacitor (a).
Allowing for mutual coupling between windings produces an equivalent circuit containing a negative inductance (b).
Replacing the negative inductance with a capacitor yields an easily modeled equivalent circuit (c).