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A General Formulation of Applied Potential Tomography

Authors
Publisher
American Geophysical Union
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Disciplines
  • Communication

Abstract

Elektrotechnik & Informationstechnik (2012) 129/6: 383–386. DOI 10.1007/s00502-012-0051-y ORIGINALARBEITEN Antennas for next generation mobile communications J.B. Andersen Life Fellow IEEE, G.F. Pedersen In future mobile communications many antennas will coexist on the device. This creates a number of problems related to bandwidth, efficiency, and correlation. Remedies are discussed in the paper, and attention is called to the promising area of adaptive matching, which also can solve problems related to the user. Keywords: antennas; mobile; millimeter Antennen für die nächste Mobilfunk-Generation. In der künftigen Mobilkommunikation werden mehrere Antennen auf einem Gerät vorhanden sein. Dies schafft eine Reihe von Pro- blemen im Zusammenhang mit Bandbreite, Effizienz und Korrelation. Im vorliegenden Beitrag werden mögliche Lösungen diskutiert, wobei im Besonderen der zukunftsträchtige Bereich der adaptiven Anpassung betrachtet wird. Diese wird auch in der Lage sein, bestehende anwenderseitige Herausforderungen zu bewältigen. Schlüsselwörter: Antennen; Mobilkommunikation; Millimeter Received March 29, 2012, accepted April 10, 2012, published online November 9, 2012 © Springer-Verlag Wien 2012 1. Introduction Antennas 50 years ago were simple in principle, usually simple wire structures, which were difficult to analyze theoretically, and they were usually stationary. Designers were concerned with gain, side- lobe level and such point-to-point issues. The emerging satellite communications put high demands on the performance, but ter- restrial mobile communications have changed all that. At least for the handsets the demands on the radiation pattern are minor; in fact the mean gain is unity in a completely random environment. The days of theoretical integral equation studies are over, in fact the present day numerical codes for solving complex electromag- netic structures are so efficient that they are used everywhere. The results are not questioned, which may be a proble

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