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www.adv-radio-sci.net/7/43/2009/
doi:10.5194/ars-7-43-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
Efficient evaluation of antenna fields by a time-domain multipole analysis
Institute for Electrical and Information Engineering, Christian-Albrechts-Universität zu Kiel, Germany
Abstract. 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 antenna.
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Citation: Adam, J. and Klinkenbusch, L.: Efficient evaluation of antenna fields by a time-domain multipole analysis, Adv. Radio Sci., 7, 43-48, doi:10.5194/ars-7-43-2009, 2009. Bibtex EndNote Reference Manager XML
