Radiation Characteristics of a Source in a Thin Substrate Mounted Over a Dielectric Medium

Nader Engheta, University of Pennsylvania
Charles Elachi, California Institute of Technology

Article comments

Copyright 1988 IEEE. Reprinted from IEEE Transactions on Antennas and Propagation, Volume 36, Issue 3, March 1988, pages 322-330.

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Abstract

The radiation pattern of a line source is calculated for the case where the source is lying on the top or the bottom surface of a lossless dielectric substrate that is mounted on the top of a semi-infinite dielectric medium. It is found that in both cases the pattern along interfaces has a null; that the pattern in the upper semi-infinite medium has a single lobe; and that the pattern in the lower semi-infinite medium has many lobes, the number of which varies with the substrate thickness. It is shown that in both cases the power radiated into the lower medium is more than that radiated into the upper medium. Applications of this calculation in remote sensing, microstrip antenna technology, and antenna arrays are discussed.