Propagating and Scattering of the Electromagnetic Vortex Generated by a Spiral Parabolic Antenna
Keywords:
Electromagnetic vortex, incorporate modeling, MLFMA, octree grouping, orbital angular momentum, spiral parabolic antennaAbstract
A modified octree grouping scheme of the multilevel fast multipole algorithm (MLFMA) is proposed to analyze the electromagnetic (EM) scattering from the electrically large target, which is illuminated by a spiral parabolic antenna. The spiral parabolic antenna is used to generate the electromagnetic vortex of a specific mode number by adjusting the height of split. The proposed method builds two octree groups and decouples the interaction between the antenna and the target, so as to save the computational resource and improve the computational efficiency. Using this scheme, the numerical example with double metal spheres illuminated by the electromagnetic vortex reveals some special phenomena due to the spiral phase distribution, while the example with a scaled-down airplane at long operating range demonstrates that the electromagnetic vortex tends to be plane wave locally with the increase of propagation distance.
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