Foster's reactance theorem is an important theorem in the fields of electrical network analysis and synthesis. The theorem states that the reactance of a passive, lossless two-terminal (one-port) network always monotonically increases with frequency. The proof of the theorem was first presented by Ronald Martin Foster in 1924.
Read more about Foster's Reactance Theorem: Explanation, Examples, Poles and Zeroes, Realization, Non-Foster Networks, History
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