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By Robert S. Elliott

A vintage Reissue within the IEEE Press sequence on Electromagnetic Wave thought —Donald G. Dudley, sequence Editor

"Beautifully and obviously written and of the top technical quality." -Dr. Robert J. Mailloux, AFRL/SNH

"A vintage paintings within the box. there are lots of special descriptions of key electromagnetic thoughts mentioned during this textual content that aren't stumbled on anyplace else. the writer is likely one of the most sensible researchers during this box. lots of his scholars also are prime researchers during this box. this article has been utilized by some of the senior antenna engineers in industry." -Kathleen L. Virga, collage of Arizona, Tucson

First released in 1981, Robert S. Elliott's Antenna concept and layout is without doubt one of the most important works in electromagnetic concept and purposes. In its broad-ranging, analytic remedy, replete with aiding experimental facts, Antenna conception and layout conveys basic tools of research that may be used to foretell the electromagnetic habit of approximately every thing that radiates. After greater than twenty years, it is still a key source for college kids, professors, researchers, and engineers who require a finished, in-depth remedy of the topic.

according to requests from a lot of our contributors, IEEE is now reissuing this vintage. Newly revised, it once more could be a useful textbook and an everlasting reference for working towards engineers.

The IEEE Press sequence on Electromagnetic Wave thought deals impressive insurance of the sphere. It involves new titles of latest curiosity in addition to reissues and revisions of well-known classics by way of verified authors and researchers. The sequence emphasizes works of long term archival importance in electromagnetic waves and purposes. Designed in particular for graduate scholars, researchers, and practising engineers, the sequence offers cheap volumes that discover and clarify electromagnetic waves past the undergraduate point.

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4a. Fig. 4 Geometries for T w o Applications of the Reciprocity Theorem The volume V is enclosed between the surfaces S , and S,, with S , completely surrounding S , . 134) has a null value. 134) vanishes. 136) occurs if d S is instead drawn outward from V,, the volume enclosed by S , . 136). 136 will be used in Chapter 7 in the establishment of the induced EMF method for computing the self-impedance of a dipole. 3. 4b. The closed surface S , excludes all the sources, that is, the volume V, is source free.

21). The total current density and field at any point are therefore 9The decomposition of the total current system into impressed and response current densities is arbitrary, but often forms a natural division. For example, the currents that flow in a dipole may be considered to be a response to the impressed currents that flow in the generator and transmission line feeding the dipole. T h e F a r - F ~ e l dIntegrals, Reciproclty. 22), J i = V x H , - - 2dD -Jr at so that d 3 P = [-E . 36) may b: rewritten as This result gives the power balance in a volume element dV.

B. INTEGRAL SOLUTIONS OF MAXWELL'S EQUATIONS I N T E R M S O F THE SOURCES The next four sections and two related appendices are devoted to a rigorous solution of Maxwell's equations in integral form, giving the fields at any point within a volume V in terms of the sources within V and the field values on the surfaces S that bound V. One advantage to this development, beyond its rigor, is that the results are in a perfect form to delineate approaches to the two types of antennas mentioned in the introduction, namely those on which the current distribution is known quite well (such as dipoles and helices), and those for which the close-in fields are known quite well (such as slots and horns).

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