Generation of a wide-band electromagnetic response through a Laguerre expansion using early-time and low-frequency data

Tapan K. Sarkar, Jinhwan Koh

Research output: Contribution to journalArticle

15 Scopus citations


The objective of this paper is to generate a wide-band and temporal response for three-dimensional conducting structures. This is accomplished through the use of a hybrid method that involves generation of early-time and low-frequency information for the electromagnetic structure of interest. These two, early-time and low-frequency information, are mutually complementary and contain all the necessary information for an ultrawide-band response for a sufficient record length. The time-domain response is modeled as a Laguerre series expansion. The frequency-domain response is also expressed in an analytic form using the same expansion coefficients used in modeling of the time-domain response. The data in both the domains is used to solve for the polynomials coefficients in a data-fitting procedure. Once the polynomial coefficients are known, the available data is simultaneously extrapolated in both domains. This approach is attractive because expansions with a few terms give good extrapolation in both time and frequency domains. The computation involved is minimal with this method.

Original languageEnglish (US)
Pages (from-to)1408-1416
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number5
StatePublished - May 1 2002



  • Early time
  • Hybrid methods
  • Laguerre expansion
  • Low frequency

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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