Frequency-independent scattering for the large sphere

Wei E.I. Sha, Weng Cho Chew

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The high frequency scattering of a scalar plane wave from an impenetrable sphere with the diameter of one thousand wavelength is treated by the saddle-point technique and the numerical steepest descent method. The far-field solution for the sphere is computed in the observation angle range of 0 to 180 degree. In particular, a novel numerical steepest descent method is proposed to overcome the breakdown of the traditional saddle-point technique in the forward region. Numerical results show that the CPU time for the far-field calculation is frequency-independent with controllable error. This work can be used to benchmark future works in frequency-independent methods.

Original languageEnglish (US)
Title of host publicationAPMC 2009 - Asia Pacific Microwave Conference 2009
Number of pages4
StatePublished - 2009
Externally publishedYes
EventAsia Pacific Microwave Conference 2009, APMC 2009 - Singapore, Singapore
Duration: Dec 7 2009Dec 10 2009

Publication series

NameAPMC 2009 - Asia Pacific Microwave Conference 2009


OtherAsia Pacific Microwave Conference 2009, APMC 2009


  • Frequency independent
  • High frequency scattering of sphere
  • Numerical steepest descent method
  • Saddle-point technique

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering


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