03655nam a22005295i 4500001001800000003000900018005001700027007001500044008004100059020003700100024003500137050001800172072001600190072002300206072001500229100008300244245009800327250001800425264007200443300006600515336002600581337002600607338003600633347002400669490003100693505031100724520143101035650002302466650003502489650002602524650002502550650002902575650006602604650005002670650005002720650005802770710003402828773002602862776003602888776003602924776003602960830003802996856004603034912001403080912001403094999001703108978-981-99-9449-6DE-He21320251030110922.0cr nn 008mamaa240116s2024    si |    s    |||| 0|eng d  a97898199944969978-981-99-9449-67 a10.1007/978-981-99-9449-62doi 4aTK5101-5105.9 7aTJF2bicssc 7aTEC0240002bisacsh 7aTJF2thema1 aXiao, Gaobiao.eauthor.4aut4http://id.loc.gov/vocabulary/relators/aut96959610aElectromagnetic Sources and Electromagnetic Fieldsh[electronic resource] /cby Gaobiao Xiao.  a1st ed. 2024. 1aSingapore :bSpringer Nature Singapore :bImprint: Springer,c2024.  aXV, 335 p. 180 illus., 150 illus. in color.bonline resource.  atextbtxt2rdacontent  acomputerbc2rdamedia  aonline resourcebcr2rdacarrier  atext filebPDF2rda1 aModern Antenna,x2731-79940 aElectromagnetic 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.  aThis 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. . 0aTelecommunication. 0aElectrical engineering.965586 0aMathematical physics. 0aComputer simulation. 0aComputer science.95855214aMicrowaves, RF Engineering and Optical Communications.96575224aElectrical and Electronic Engineering.96558824aComputational Physics and Simulations.96556424aTheory and Algorithms for Application Domains.9670302 aSpringerLink (Online service)0 tSpringer Nature eBook08iPrinted edition:z978981999448908iPrinted edition:z978981999450208iPrinted edition:z9789819994519 0aModern Antenna,x2731-799496741440uhttps://doi.org/10.1007/978-981-99-9449-6  aZDB-2-ENG  aZDB-2-SXE  c57209d57209