Time-domain near-field analysis of short-pulse antennas-part I: spherical wave (multipole) expansion

Amir Shlivinski, E. Heyman

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

The radiation from a time-dependent source distribution in free-space is analyzed using time-domain (TD) spherical wave (multipole) expansion. The multipole moment functions are calculated from the time-dependent source distribution. The series convergence rate in the near and far zone and the bounds on the near-zone reactive field are determined as functions of the source support and of the pulse length. The formulation involves a spherical transmission line representation that can be extended to more general spherical configurations. This formulation also describes the field and energy transmission mechanisms in a physically transparent fashion that will be used in a companion paper to define and explore fundamental concepts such as TD reactive energy and Q and to derive bounds on the antenna properties. Finally, the concepts discussed above are demonstrated numerically for pulsed radiation by a circular current disk.

Original languageEnglish
Pages (from-to)271-279
Number of pages9
JournalIEEE Transactions on Antennas and Propagation
Volume47
Issue number2
DOIs
StatePublished - 1 Dec 1999
Externally publishedYes

Keywords

  • Antenna theory
  • Near field
  • Short-pulse electromagnetics
  • Time-domain analysis

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