03840nam a22005775i 4500 978-981-99-9449-6 DE-He213 20251030110922.0 cr nn 008mamaa 240116s2024 si | s |||| 0|eng d 9789819994496 978-981-99-9449-6 10.1007/978-981-99-9449-6 doi TK5101-5105.9 TJF bicssc TEC024000 bisacsh TJF thema Xiao, Gaobiao. author. aut http://id.loc.gov/vocabulary/relators/aut 69596 Electromagnetic Sources and Electromagnetic Fields [electronic resource] / by Gaobiao Xiao. 1st ed. 2024. Singapore : Springer Nature Singapore : Imprint: Springer, 2024. XV, 335 p. 180 illus., 150 illus. in color. online resource. text txt rdacontent computer c rdamedia online resource cr rdacarrier text file PDF rda Modern Antenna, 2731-7994 Electromagnetic Sources and Electromagnetic Fields -- Q Factor of a Radiator -- Non-Relativistic Radiation of a Moving Charge -- Spherical Harmonic Expansion -- Nonuniform Transmission Line Model -- Pulse Radiator in Free Space -- Synthesis of Far Field Patterns -- Electromagnetic Inverse Source Problems. This book presents a modified spherical harmonic expansion method in which the electromagnetic fields and their sources are expanded with the same set of spherical vector basis functions in a similar procedure. Explicit expressions for the electromagnetic fields, potentials, energies, and the related Green’s functions are derived for the spherical modes in both frequency domain and time domain. Based on the formulation, the relationships between the electromagnetic sources, the electromagnetic far fields, and the electromagnetic near fields are clearly revealed. In particular, a nonuniform transmission line model is developed for intuitively characterizing the total radiation process. The introduction of the cutoff radius and the cutoff mode degree provides a simple reference for determining the numbers of degrees of freedom of the fields associated with sources in a bounded region. Based on the theory, an efficient hybrid method for synthesizing antenna arrays with complex footprints is proposed and demonstrated with several numerical examples. Effective algorithms are also developed for reconstructing the radiating part of the current sources. This book is intended for researchers, engineers, and graduate students who are interested in studying the energy transfer in electromagnetic radiation, synthesis and measurement of antenna arrays, and applications of inverse electromagnetic source problems. . Telecommunication. Electrical engineering. 65586 Mathematical physics. Computer simulation. Computer science. 58552 Microwaves, RF Engineering and Optical Communications. 65752 Electrical and Electronic Engineering. 65588 Computational Physics and Simulations. 65564 Theory and Algorithms for Application Domains. 67030 SpringerLink (Online service) Springer Nature eBook Printed edition: 9789819994489 Printed edition: 9789819994502 Printed edition: 9789819994519 Modern Antenna, 2731-7994 67414 https://doi.org/10.1007/978-981-99-9449-6 ZDB-2-ENG ZDB-2-SXE 57209 57209