Abstract

By use of the currents on the infinite cylinder excited by a radial dipole, approximate expressions for the two components of the far-zone electric field of a radial electric dipole near a perfectly conducting finite cylinder are derived. The validity of the approximation depends on the conditions, <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">kl_{2}\gg 1</tex> and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">kl_{1} \gg 1</tex> , i.e., the cylinder must be long compared to a wavelength. The expressions are initially in integral form but it is shown that they may be evaluated approximately over most of the range of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\theta</tex> by use of the saddle point method. The theoretical results are compared to experimental results for a particular cylinder.

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