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In recent times, we have seen increased interest in the direct time domain methods to calculate
electromagnetic scattering/interaction phenomenon. This may be due to the surge in activities
in the areas of EMP, short-pulse radar, or other related applications. It may also be due to the
fact that the time domain methods have several advantages over conventional frequency domain
methods. For example, time domain methods work better for wideband signature studies, are
better suited for parallel processing, and provide better visual representations for understanding
the field interactions.
Although time domain methods have been available to the user for more than a decade, there is
no single textbook dedicated to this subject for the interested student or practicing engineer. Most
of the material is scattered in research papers. It is true that some related material has appeared
as chapters in some books. Unfortunately, these books typically have very little to do with time
domain studies and such treatment is often piecemeal. Thus, we believe that a textbook devoted
entirely to time domain methods is long overdue, and we desire to fill this gap.
It is our intention to develop this book as a kind of textbook useful for teaching and for selflearning.
For this reason, the emphasis is more on describing the already existing techniques
(published in the literature) in a detailed manner rather than giving a piecemeal description of all
the current and possible future techniques. However, we assume the reader has some familiarity
with Maxwell's equations and basic mathematics. Furthermore, the book may be broadly divided
into two parts. In the first part, we deal with the solution of integral equations. These methods
have not been given the deserved attention until now, and this effort is intended to promote them or
at least to put them on equal footing with the differential equation-based techniques. The second
part examines the differential equation methods.
Finally, we note with profound regret that, during the course of development of this book,
one of the contributors. Prof. K. R. Umashankar, passed away. We respectfully acknowledge his
contributions to this book and hope that his efforts will not go in vain. |
