Title :
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
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;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2009.2037701
