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Stored electromagnetic energy and quality factor of radiating structures
Miloslav Capek1, Lukas Jelinek1, Guy A E Vandenbosch2
1Faculty of Electrical Engineering , Department of Electromagnetic Field, Czech Technical University in Prague , Technicka 2, 16627 Prague, Czech Republic.
Abstract:
This paper deals with the old yet unsolved problem of defining and evaluating the stored electromagnetic energy-a quantity essential for calculating the quality factor, which reflects the intrinsic bandwidth of the considered electromagnetic system. A novel paradigm is proposed to determine the stored energy in the time domain leading to the method, which exhibits positive semi-definiteness and coordinate independence, i.e. two key properties actually not met by the contemporary approaches. The proposed technique is compared with an up-to-date frequency domain method that is extensively used in practice. Both concepts are discussed and compared on the basis of examples of varying complexity.
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