Forward Scattering of Loaded and Unloaded Antennas

Forward scattering of antennas is related to antenna performance via the forward-scattering sum rule. The forward-scattering sum rule is an integral identity that shows that a weighted integral of the extinction cross section over all spectrum is proportional to the static polarizability of the ante...

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Veröffentlicht in:	IEEE transactions on antennas and propagation 2012-12, Vol.60 (12), p.5663-5668
Hauptverfasser:	Gustafsson, M., Andersen, J. B., Kristensson, G., Pedersen, G. F.
Format:	Artikel
Sprache:	eng
Schlagworte:	Absorption Absorption efficiency Antenna measurements Antennas Applied sciences Cross sections Dipole antennas Electrical Engineering, Electronic Engineering, Information Engineering Elektroteknik och elektronik Engineering and Technology Exact sciences and technology Extinction extinction cross section Forward scattering Integrals Loaded antennas Lossless polarizability Radiocommunications Receiving antennas Scattering Sum rule Sum rules Teknik Telecommunications Telecommunications and information theory
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Beschreibung
Zusammenfassung:	Forward scattering of antennas is related to antenna performance via the forward-scattering sum rule. The forward-scattering sum rule is an integral identity that shows that a weighted integral of the extinction cross section over all spectrum is proportional to the static polarizability of the antenna structure. Here, the forward-scattering sum rule is experimentally verified for loaded, short-circuit, and open-circuit cylindrical dipole antennas. It is also shown that the absorption efficiency cannot be greater than 1/2 for reciprocal linearly polarized lossless matched antennas with a symmetric radiation pattern in the forward and backward directions.
ISSN:	0018-926X 1558-2221
DOI:	10.1109/TAP.2012.2214191