KEYWORDS: Antennas, Metamaterials, Reflectors, Telecommunications, Switching, Control systems, Signal processing, Solar cells, Reflector design, Mirrors
Antennas with actively tunable radiation patterns are advanced devices for providing distant communication, but the disadvantage of such antennas is the mechanical control of the position and reflectors characteristics. Sometimes, when it would be necessary to provide directional communication, it is necessary to install additional antennas, although the reflector feed would have the required characteristics. The simulation results show that the proposed antenna design allows controlling the characteristics of radiation patterns in a wide frequency range. Thus, in the mode of a transparent reflector, the radiation pattern of the irradiator is provided; in the presence of switching in the layers of the metamaterial, the formation of a narrowly directed beam of the radiation pattern of the mirror antenna is ensured. This design providing broadband communication with various characteristics of radiation patterns.
This article discusses various aspects of coherent control of the medium using a preparatory laser radiation that provides favorable conditions for the propagation of useful radiation. We discussed the possibility of decrease molecular scattering full section in channels of propagation of laser signals, formation of clarified channel in the inhomogeneous medium of propagation and we analyze the molecular dissociation resulting from an increase in rotational energy induced by two successive laser pulses with orthogonal polarizations. Based on the results of calculations, a constant dipole moment of the molecule is shown to play an insignificant role in its orientation in a laser field.
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