Interpolating Spherical Harmonics for Computing Antenna Patterns

Abstract

This report reviews spherical harmonic expansions to compute wideband antenna patterns. Some "antenna" patterns, such as the far-field of a ship, require lots of computer time per each frequency. Consequently, computing such a pattern across a wide frequency band at each frequency is prohibitive. Spherical harmonics offer an alternative-compute the pattern over a coarse sampling across the frequency band, interpolate the spherical harmonics, and use these harmonics to recover the pattern at a fine frequency sampling with small CPU. This report develops an adaptive spline interpolation algorithm with error control. The development used antennas with smooth analytic patterns for verification. Further developments must test this algorithm on a suite of tactical antenna patterns.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2011
Accession Number
ADA554243

Entities

People

  • J. C. Allen
  • J. Meloling
  • J. Rockway

Organizations

  • Naval Information Warfare Systems Command

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Air Force Research Laboratories
  • Algorithms
  • Broadband Antennas
  • Channel Capacity
  • Communication Channels
  • Compressed Sensing
  • Computations
  • Department Of Defense
  • Electromagnetic Fields
  • Estimators
  • Far Field
  • Frequency
  • Frequency Bands
  • Governments
  • Multiple Input Multiple Output
  • Spherical Harmonics
  • United States Government

Readers

  • Approximation Theory.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering