At a single operating frequency any impedance with a negative (capacitive) reactance may be exactly represented by either a parallel RC network or series RC network. The math is quite simple. The results are even summarized in the figure. The book by Krauss et. al. referenced below provides some additional narrowband (exact at one frequency, close over a narrow frequency range) transformations.

Selected References

1. Herbert L. Krauss, Charles W. Bostain and Frederick H. Raab, "Solid State Radio Engineering", John Wiley and Sons, New York, 1980.

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