Mutual Impedance Properties in a Lossy Array Antenna

Tokarsky, Peter L.

doi:https://doi.org/10.1155/2019/1687497

International Journal of Antennas and Propagation

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Research Article | Open Access

Volume 2019 | Article ID 1687497 | https://doi.org/10.1155/2019/1687497

Mutual Impedance Properties in a Lossy Array Antenna

Peter L. Tokarsky¹

Academic Editor: Hervé Aubert

Received11 Aug 2019

Accepted05 Oct 2019

Published11 Nov 2019

Abstract

The impedance matrix of an arbitrary multiport array antenna with Ohmic losses was studied. It was assumed that the partial current distributions in the array, corresponding to the alternate exciting one of its terminals while the other ones are open-circuited, are known. Consideration of the power balance in the lossy array antenna has allowed ascertaining that its impedance matrix is a sum of the radiation resistance matrix and loss resistance matrix, which are in general case complex Hermitian matrices and only in some particular cases can be real. The theoretical statements obtained are confirmed by two numerical examples, where analysis of two lossy dipole arrays was performed. In the first example, the dipoles were located above the imperfect ground, which served as a source of losses, and in the second example, the same dipoles were located in free space, and the embedded parasitic element was the source of losses. The results of the analysis showed that the asymmetric placement of energy absorbers in the array antennas leads to the appearance of imaginary parts in the matrices of radiation and loss resistances, which allow one to correctly predict the behavior of the array radiation efficiency during beam scanning.

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Copyright

Copyright © 2019 Peter L. Tokarsky. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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