Physics – Classical Physics
Scientific paper
2009-05-02
ISSN 1401-5757 (2007)
Physics
Classical Physics
Diploma thesis at Uppsala University, Sweden, 2007. 196 pages
Scientific paper
In this diploma thesis we study the characteristics of electromagnetic fields carrying orbital angular momentum (OAM) by analyzing and utilizing results achieved in optics and then apply them to the radio domain to enable innovative radio studies of space and the development of new concepts in wireless communications. With the recent advent of fast digital converters it has become possible, over a wide radio frequency range, to manipulate not only the modulation properties of any given signal carried by a radio beam, but also the physical field vectors which make up the radio beam itself. Drawing inferences from results obtained in optics and quantum communication research during the past 10-15 years, we extract the core information about fields carrying orbital angular momentum. We show that with this information it is possible to design an array of antennas which, together with digital receivers/transmitters, can readily produce, under full software control, a radio beam that carries electromagnetic orbital angular momentum, a classical electrodynamics quantity known for a century but so far preciously little utilized in radio, if at all. This electromagnetic field is then optimized with the help of various antenna array techniques to improve the radio vector field qualities. By explicit numerical solution of the Maxwell equations from first principles, using a de facto industrial standard antenna software package, we show that the field indeed carries orbital angular momentum, and give a hint on how to detect and measure orbital angular momentum in radio beams. Finally, we discuss and give an explanation of what this can be used for and what the future might bring in this area.
Palmer Kristoffer
Sjöholm Johan
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