Orbital Angular Momentum in Radio—A System Study

Author

Mohammadi, Siavoush Mohaghegh ; Daldorff, Lars K S ; Bergman, Jan E S ; Karlsson, Roger L. ; Thidé, Bo ; Forozesh, Kamyar ; Carozzi, Tobia D. ; Isham, Brett

Author_Institution

Swedish Inst. of Space Phys., Uppsala, Sweden

Volume

58

Issue

2

fYear

2010

Firstpage

565

Lastpage

572

Abstract

Recent discoveries concerning rotating (helical) phase fronts and orbital angular momentum (OAM) of laser beams are applied to radio frequencies and comprehensive simulations of a radio OAM system are performed. We find that with the use of vector field-sensing electric and magnetic triaxial antennas, it is possible to unambiguously estimate the OAM in radio beams by local measurements at a single point, assuming ideal (noiseless) conditions and that the beam axis is known. Furthermore, we show that conventional antenna pattern optimization methods can be applied to OAM-generating circular arrays to enhance their directivity.

Keywords

angular momentum; antenna radiation patterns; beam steering; conical antennas; laser beams; optimisation; radiocommunication; antenna pattern; circular arrays; laser beams; magnetic triaxial antennas; optimization methods; orbital angular momentum; radio OAM system; radio beams; radio frequencies; vector field-sensing electric antennas; Antenna arrays; Antenna measurements; Electric variables measurement; Extraterrestrial measurements; Laser beams; Magnetic field measurement; Magnetic noise; Noise measurement; Optimization methods; Radio frequency; Directivity optimization; microwave orbital angular momentum; orbital angular momentum (OAM); radio orbital angular momentum; rotating phase fronts;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2009.2037701

Filename

5345758