PLASMA ANTENNA ON THE BASIS OF THE STRATIFIED PLASMA POST
DOI:
https://doi.org/10.26906/SUNZ.2018.4.042Keywords:
striations, microwave radiation, cold plasma, surface waves, directional patternAbstract
The subject of the study in the article is the radiation of a plasma antenna, in which the longitudinal heterogeneity is a stratum, that is, the zone of high and low density of the plasma. The aim is to calculate the directivity patterns and co-factors of the transformation of the surface plasma energy of the plasma cylinder into the energy of radiation. Objective: An analysis of the dependence of the directional diagrams and the coefficients of the transformation of the energy of the surface wave from the geometric parameters of the antenna (plasma cylinder radii and dielectric shell), plasma density, radiation frequency, dielectric permeability, and others. The methods used are the spectral method, the pass method for calculating the asymptotic integral, the method of successive approximations for the solution of the system of introspection equations. The following results are obtained. It is shown that with a small number of strata, the plasma antenna radiates at small angles to the antenna axis. The directional diagram for practically important antenna parameters is calculated. The dependences of the energy conversion factor in the radiation on the depth of modulation of stationary stratums and stratums, whose amplitudes change, are obtained. Conclusions. The studies carried out in the article showed that the stratified plasma column can be used as an antenna. The maximum of the main petal of the directional pattern, which has a small width of half the heights, and is located at small angles to the antenna axis. The above examples show that the energy conversion factor in radiation reaches 10 - 30%.Downloads
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