Multilevel fast physical optics algorithm for radiation from non-planar apertures

Amir Boag*, Christine Letrou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A novel multilevel algorithm for computing the radiation patterns of nonplanar aperture antennas over a range of observation angles is presented. The proposed technique is directly applicable to reflector and lens antennas as well as to radomes. The multilevel computational sequence is based on a hierarchical decomposition of the radiating aperture and comprises two main steps. First, computation of the radiation patterns of all subapertures of the finest level over a very coarse angular grid. Second, multilevel aggregation of the radiation patterns of neighboring subapertures into the final pattern of the whole aperture via a phase compensated interpolation. The multilevel algorithm attains computational complexity comparable to that of the fast Fourier transform based techniques while avoiding their limitations.

Original languageEnglish
Pages (from-to)2064-2072
Number of pages9
JournalIEEE Transactions on Antennas and Propagation
Issue number6
StatePublished - Jun 2005


  • Computation time
  • Fast algorithms
  • Lens antennas
  • Multilevel algorithms
  • Physical optics
  • Radomes
  • Reflector antennas


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