Efficient evaluation of antenna fields by a time-domain multipole analysis

J. Adam*, L. Klinkenbusch

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Abstrakt

The contribution describes a systematic method to efficiently determine frequency-domain electromagnetic antenna fields and characteristics for a broad spectrum via a single time-domain (e.g., Finite-Difference Time-Domain, FDTD) calculation. From a time-domain simulation of an antenna driven by a wide-band signal, a single modified Fourier transformation yields the frequency-domain multipole amplitudes. The corresponding multipole expansions are valid for the entire spectrum of the input pulse and at any point outside a minimum sphere enclosing the antenna. This allows a computationally cheap and elegant post-processing of arbitrary antenna characteristics. As an example of use the method is applied to determine high-resolution three-dimensional radiation patterns of an antipodal Vivaldi an-tenna.

OriginalsprogEngelsk
TidsskriftAdvances in Radio Science
Vol/bind7
Sider (fra-til)43-48
ISSN1684-9965
DOI
StatusUdgivet - 2009
Udgivet eksterntJa

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