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Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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ON THE INFLUENCE OF INCOMPLETE RADIATION PATTERN DATA ON THE ACCURACY OF A SPHERICAL WAVE EXPANSION

By P. Koivisto and J. C.-E. Sten

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Abstract:
The accuracy of a spherical wave expansion is examined when the expansion is calculated from incomplete data of the radiation pattern, i.e., when field data on a part of the far-field sphere is missing. The effect of antenna size and truncation index on the interpolation capacity of a SWE is examined by using an analytical expression for the radiation pattern of wire antennas of different lengths. The error of the SWE is seen to increase drastically when the smallest diameter of the dead zone surpasses the length of a period of the highest included wave function. The influence of the size and shape of the dead zone is studied by the aid of a measured pattern, of which a part of the field data is ignored. Two different ways are proposed for estimating the accuracy of the obtained SWE in a practical instance, when the field in the dead zone is unknown.

Citation:
P. Koivisto and J. C.-E. Sten, "On the Influence of Incomplete Radiation Pattern Data on the Accuracy of a Spherical Wave Expansion," Progress In Electromagnetics Research, Vol. 52, 185-204, 2005.
doi:10.2528/PIER04080902
http://www.jpier.org/PIER/pier.php?paper=0408092

References:
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doi:10.2528/PIER03120301

2. Koivisto, P., "Demonstration of reflection error reduction in antenna radiation patterns using spherical wave expansion," Microwave and Optical Technology Letters, 2004.

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4. Harrington, R. F., Time-Harmonic Electromagnetic Fields, McGraw-Hill, 1961.

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8. Koivisto, P., "Elimination of rotation axes offset error in antenna radiation pattern measurements using spherical wave expansion," Submitted for publication in Int. J. Electron. Commun. (AEü)..


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