Time Harmonic and Transient Scattering by Finite Periodic Flat Strip Arrays: Hybrid (Ray)-(Floquet Mode)-(MOM) Algorithm


Journal Article

Finite periodic structures are of interest in a variety of Narrowband applications. With the trend toward wider bandwidth, culiminating in the ultra-wideband or short pulse (SP) regime, it is of interest to explore how well defined narrowband wave fields, such as the dispersive periodic structure modes, behave under SP conditions. These considerations have motivated the present frequency and SP time-domain (TD) study of two-dimensional plane wave scattering from a finite periodic array of thin, flat, coplanar perfectly conducting strips. Rigorous analytical-numerical reference solutions are established by spatial spectral wave number decomposition and the method of moments (MOM), followed by frequency inversion. The analytical portion is approximated so as to yield via high-frequency asymptotics, for a sufficiently large number of strips, a hybrid ray-(Floquet mode)-MOM algorithm which not only explains the phenomena in physical terms but is also numerically efficient and reasonably accurate when compared with the reference solution. Of special interest are the TD Floquet modes with their spacetime dependent frequencies and wave numbers. By superposition, they can synthesize the highly resolved pulse train return under SP conditions. Attention is given also to direct SP-TD synthesis, and to processing options of SP-TD data. © 1993 IEEE

Full Text

Duke Authors

Cited Authors

  • Carin, L; Felsen, LB

Published Date

  • January 1, 1993

Published In

Volume / Issue

  • 41 / 4

Start / End Page

  • 412 - 421

Electronic International Standard Serial Number (EISSN)

  • 1558-2221

International Standard Serial Number (ISSN)

  • 0018-926X

Digital Object Identifier (DOI)

  • 10.1109/8.220973

Citation Source

  • Scopus