| At present,with the rapid development of science and technology and the everincreasing demand for resources,space resources have become one of the important goals of various countries competing for development.Aerospace vehicles are particularly important as a tool for the development of space resources.This also means that highaltitude vehicles will inevitably face the problem of communication interruption,that is,the black barrier problem.This is the most challenging problem encountered by aerospace vehicles so far.One of the difficult problems.The black barrier problem is mainly reflected in the transmission of electromagnetic waves in the dispersive medium plasma,so it is very necessary to study the relationship between the two to alleviate the black barrier problem.Therefore,the research of this topic is of great significance to alleviate the black barrier problem.Although domestic and foreign scholars and researchers have done a lot of research on the transmission of electromagnetic waves in plasma,and its transmission mechanism is relatively perfect,there are still some problems worthy of our in-depth consideration and solution.Therefore,this article has carried out related research on the transmission of electromagnetic waves in plasma on the basis of the metamaterial electric small antenna.The main purpose is to transmit electromagnetic waves in the plasma.The main work of this paper is as follows:1.This thesis studies the influence of high density and thin plasma layer on radiation regulation of electric small antenna,and makes theoretical calculations and related simulations,and analyzes the simulation results,and summarizes the influence of plasma layer parameters and antenna parameters on antenna radiation performance under resonant conditions.The study found that the relationship between the antenna resonant frequency and the plasma frequency when the plasma spherical sheath covers the electric small antenna is linear,and the ratio between the two is 0.57,which is consistent with theoretical calculations,And when the plasma sheath and the electric small antenna resonate,the radiation performance of the electric small antenna is enhanced.Based on a single antenna,an antenna array is designed to improve the radiation performance of the wire in a certain direction.The results show that the antenna array can increase the gain of the antenna in a certain radiation direction,and then the plasma sheath is developed.Experiments related to small electrical antennas show that the plasma sheath can effectively improve the radiation efficiency of small electrical antennas.2.From the perspective of an artificial metamaterial structure antenna,the effect of a metamaterial structure electric small antenna on plasma is studied.Firstly,the unit structure of supermaterials is simulated and its electromagnetic parameters are inverted to obtain its band interval,and the influence law of the parameter changes of the structure of artificial supermaterial units on its electromagnetic characteristics is further analyzed,and the shell-type supermaterials are designed according to this,and then the supermaterial electric antenna is designed on the basis of the shell-type supermaterials.The relationship between the resonant point of the supermaterial antenna and the plasma density is simulated,and the performance of the antenna is compared with that of the antenna when there is no supermaterial,and the radiation gain of the small antenna is improved when there is supermaterial. |
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