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Three contradictory but state-of-the-art concepts for defining and evaluatingstored electromagnetic energy are treated in this communication, and arecollated with the widely accepted definition of stored energy, which is thetotal energy minus the radiated energy. All three concepts are compared, andthe results are discussed on an example of a dominant spherical mode, which isknown to yield dissimilar results for the concepts dealt with here. It is shownthat various definitions of stored energy density immanently imply diversemeanings of the term "radiation".

Various Interpretations of the Stored and the Radiated Energy Density