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The book presents solutions to a complex of internal and external
problems of electromagnetics associated with the development of
theory, construction of mathematical models and the development of
rigorous methods for calculating the electrodynamic characteristics
of combined vibrator-slot structures. The solutions of problems for
determining the characteristics of impedance vibrator and slot
radiators with arbitrary geometric and electrophysical parameters
presented in the monograph were obtained within the framework of
the unified methodological approach to construct asymptotic
solutions of integral equations on currents and their systems. This
approach made it possible to study a number of new combined
vibrator-slot structures. The research results reveal the
possibilities of using such structures as basic elements in the
creation of modern antenna-waveguide devices operating in the
ranges from meter to millimeter wavelengths, with new technical
characteristics and functional purpose. The book is intended for
senior and postgraduate students and researchers working in the
fields of radiophysics, radio engineering and antenna-feeder
design. The book covers the following topics: * excitation of
electromagnetic waves in volumes with coordinate boundaries;*
general issues of the theory of thin impedance vibrators and narrow
slots in a spatial-frequency representation;* solution of current
equations for isolated vibrator and slot scatterers;* combined
radiating vibrator-slot structures in rectangular waveguide;*
T-junctions of rectangular waveguides with vibrator-slot structures
in coupling areas;* waveguide radiation of the combined
vibrator-slot structures;* combined vibrator-slot structures
located on a perfectly conducting sphere;* combined vibrator-slot
Radiators in antenna arrays;* ultrawideband vibrator-slot
structures;
The book is devoted to exploring the foundations of the theory of
thin impedance vibrator antennas. The text provides a continuation
of the classic theory of thin perfectly conducting vibrators. Many
consider impedance conception one of the most universal models in
the theory of wave processes, as it informs such a wide spectrum of
uses in solving practical problems of electrodynamics. This topic
provides an opportunity to further search analytical solutions,
allowing a simplification of the mathematical formulation of the
boundary problem. The theory strives to widen the boundaries of the
impedance vibrator antennas application in complex modern
radio-and-electronic systems and devices. The results of much
original research conducted by the authors will be useful for
practicing engineers and designers of antenna and waveguide
systems. The book is written in an academic style, and can be used
to teach students and post graduates about radiotechnical and
radiophysical specialities. The conclusion of the book lists many
actual applied problems, which can provide inspiration for several
potential PhD projects. Topics covered in this book are: *general
questions of the theory of impedance vibrators in the
spatial-frequency representation *electromagnetic waves radiation
by impedance vibrators in free space and material mediums
*electromagnetic waves radiation by impedance vibrators in material
mediums over the perfectly conducting plane *electromagnetic waves
scattering by irregular impedance vibrators in free space
*generalized method of induced electromotive forces for
investigation of the characteristics of impedance vibrators
*radiation of electromagnetic waves by radial impedance vibrators
on the perfectly conducting sphere *electromagnetic waves
scattering by impedance vibrators in the rectangular waveguide
This book provides the reader with the possibility of rapid
study and application of methods of computer analysis of
electrodynamic problems. The authors address the development of
analytical methods to solve the problems of diffraction of
waveguide electromagnetic waves on slot coupling holes. All the
authors have experience in the field and the topics addressed are
based on their original research results. The book is written in a
laconic style and is visually accessible.
This book discusses the problem of electromagnetic wave excitation
in spatial regions with spherical boundaries and the accurate
mathematical modeling based on numerical and analytical methods to
significantly reduce the time required for developing new antenna
devices. It particularly focuses on elements and systems on mobile
objects of complex shape that are made of new technological
materials. The experimental development of such devices and systems
is an extremely time-consuming, lengthy, and expensive process. The
book is intended for senior and postgraduate students and
researchers working in the fields of radiophysics, radio
engineering and antenna design. The authors assume that readers
understand the basics of vector and tensor analysis, as well as the
general theory of electrodynamics. The original results presented
can be directly used in the development of spherical antennas and
antenna systems for the mobile objects. The book addresses problems
concerning the construction of Green's functions for Hertz
potentials in electrodynamic volumes with spherical boundaries, and
solves these clearly and concisely. It also uses specific examples
to analyze areas where the results could potentially be applied.
The book covers the following topics: * excitation of
electromagnetic fields in coordinate electrodynamic volumes; *
Green's functions for spherical resonators; * Green's functions for
infinite space outside of spherical scatterers; * electromagnetic
fields of dipole radiators on spherical scatterers; *
electromagnetic fields of thin radial impedance vibrators on
perfectly conducting spheres; * electrodynamic characteristics of
narrow slots in spherical surfaces; * multi-element and combined
vibrator-slot radiators on spherical surfaces.
This book discusses the problem of electromagnetic wave excitation
in spatial regions with spherical boundaries and the accurate
mathematical modeling based on numerical and analytical methods to
significantly reduce the time required for developing new antenna
devices. It particularly focuses on elements and systems on mobile
objects of complex shape that are made of new technological
materials. The experimental development of such devices and systems
is an extremely time-consuming, lengthy, and expensive process. The
book is intended for senior and postgraduate students and
researchers working in the fields of radiophysics, radio
engineering and antenna design. The authors assume that readers
understand the basics of vector and tensor analysis, as well as the
general theory of electrodynamics. The original results presented
can be directly used in the development of spherical antennas and
antenna systems for the mobile objects. The book addresses problems
concerning the construction of Green's functions for Hertz
potentials in electrodynamic volumes with spherical boundaries, and
solves these clearly and concisely. It also uses specific examples
to analyze areas where the results could potentially be applied.
The book covers the following topics: * excitation of
electromagnetic fields in coordinate electrodynamic volumes; *
Green's functions for spherical resonators; * Green's functions for
infinite space outside of spherical scatterers; * electromagnetic
fields of dipole radiators on spherical scatterers; *
electromagnetic fields of thin radial impedance vibrators on
perfectly conducting spheres; * electrodynamic characteristics of
narrow slots in spherical surfaces; * multi-element and combined
vibrator-slot radiators on spherical surfaces.
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