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Comment on ‘Numerical check on the accuracy of spherical-wave expansions’

Comment on ‘Numerical check on the accuracy of spherical-wave expansions’

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© The Institution of Electrical Engineers
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Errata or comment

A convergence criterion for the Laurent spherical-wave expansion is discussed, with particular emphasis on its dependence on the nature of the radiating source. Both an inappropriate choice of truncation point of the series and of the integration surface for the determination of the spherical-wave coefficients may introduce errors in near-field antenna calculations. However, a procedure is outlined which ensures that an accuracy of the order of one part in 105 is achieved.

Inspec keywords: antennas; electromagnetic fields; electromagnetic waves

Other keywords: radiating source; numerical check; Laurent; spherical wave expansion; near field calculations; antenna; accuracy; convergence criterion

Subjects: Antenna theory; Antennas

References

    1. 1)
      • P.J. Wood . Spherical waves in antenna problems. Marconi Rev. , 149 - 172
    2. 2)
      • J.R. James , L.W. Longdon . Calculation of radiation patterns. Electron. Lett. , 567 - 569
    3. 3)
      • A.C. Ludwig . Near-field far-field transformations using spherical wave expansions. IEEE Trans. , 214 - 220
    4. 4)
      • J.A. Stratton . (1941) , Electromagnetic theory.
    5. 5)
      • P.J. Wood . Spherical-harmonic expansions in near-field aerial problems. Electron. Lett. , 535 - 536
    6. 6)
      • A.C. Ludwig . Numerical check on the accuracy of spherical-wave expansions. Electron. Lett. , 202 - 203
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