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 Free Download Electromagnetic Sources and Electromagnetic Fields English | 2024 | ISBN: 9819994489 | 556 Pages | PDF EPUB (True) | 60 MB 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.  Free Download John Bird, "Electrical and Electronic Principles and Technology Ed 4" English | ISBN: 0080890563 | 2010 | 440 pages | PDF | 32 MB This book is written for the 6,000 BTEC National Engineering students who follow the electrical pathway each year. The course has a brand new syllabus for 2010 and Electrical and Electronic Principles and Technology has been fully updated to reflect these changes. In this 4th edition, John Bird introduces electrical principles and technology through examples rather than theory covering - enabling level three students to develop a sound understanding of the principles needed for careers in electrical engineering, electronics and telecommunications. The book includes numerous worked problems, multiple-choice and short-answer questions, exercises and revision tests and is supported with free online instructor's and solutions manuals. 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