Complex wire grid antennas: determining the optimal source location using characteristic mode analysis

Articles in Press

Document Type : Research Article

Authors

Department of Television and Control, Tomsk State University of Control Systems and Radioelectronics, 634050 Tomsk, Russia

Abstract

Wide use of radioelectronic systems requires more complex antennas. Determining the location of the excitation source (feed) in a complex antenna structure plays an important role and depends on many factors. Currently, this choice is often made based on the designer experience and requires careful modeling and analysis. One of the popular methods used in such programs is the characteristic mode analysis (CMA). However, previous CMA-based studies that determine the source location often considered the excitation of low-order modes. In this paper, we present an algorithm to determine the optimal source location in a wire grid antenna that excites all modes reasonably well. This algorithm is based on the product of characteristic current and modal significance to obtain the maximum possible current distribution along the an-tenna wires and radiation field. The proposed algorithm is tested here on the example of dipole and conical spiral structures in the frequency ranges of 0.1–1 GHz and 9–11 GHz, respectively, and verified by the method of moments.

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Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 09 July 2025

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History

  • Receive Date: 31 January 2025
  • Revise Date: 07 May 2025
  • Accept Date: 09 July 2025

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