Evaluation of the Available Directivity of a Radiating Structure in Terms of Its Characteristic Mode Content

Ruiyang Li, Derek A. McNamara, Gao Wei

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A quantity called available directivity is defined for a radiating structure in terms of its characteristic mode content. It is shown how its maximum value can be evaluated when a certain number of such modes are considered to be excited with appropriate modal excitation coefficients. The achievable directivity is found by constraining the associated quality factor. This provides a more precise way of determining the prospective directivity of a structure than the usual estimates in terms of the spherical wave modes related to the smallest sphere enclosing the structure.

Original languageEnglish
Article number8759090
Pages (from-to)6686-6691
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Volume67
Issue number10
DOIs
StatePublished - Oct 2019

Keywords

  • Achievable directivity
  • available directivity
  • characteristic modes (CMs)
  • radiating structures
  • super-directivity

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