Stored electromagnetic energy and quality factor of radiating structures.
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.
Faculty of Electrical Engineering , Department of Electromagnetic Field, Czech Technical University in Prague , Technicka 2, 16627 Prague, Czech Republic.
Miloslav
0000-0002-7442-889X
M
Capek
Faculty of Electrical Engineering , Department of Electromagnetic Field, Czech Technical University in Prague , Technicka 2, 16627 Prague, Czech Republic.
Lukas
L
Jelinek
Department of Electrical Engineering , Division ESAT-TELEMIC (Telecommunications and Microwaves), Katholieke Universiteit Leuven , 3001 Leuven, Belgium.
Guy A E
GA
Vandenbosch
antenna theory; electromagnetic theory; quality factor; stored electromagnetic energy