Electric-and magnetic-field strengths in the Fresnel zone of a microradiator formed by an electric and a magnetic dipole |
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Authors: | O G Vendik I A Pakhomov |
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Institution: | (1) St. Petersburg Institute of Electrical Engineering, St. Petersburg, 197376, Russia |
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Abstract: | The propagation of electric and magnetic fields and of the Poynting vector in the near zone (Fresnel zone) of an electric
dipole, a loop, and a dipole-loop pair is considered. The dimensions of all radiators are much smaller than the radiation
wavelength. It is shown that the ideas of the field distribution (polar diagram) in the far zone cannot be applied to the
properties of the field in the Fresnel zone. The radiated-power fraction that is absorbed by an object whose electrodynamic
properties are close to those of biological media is found at a distance from the radiator to the absorbing object on the
order of several millimeters. |
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Keywords: | |
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