| In this thesis,the research status and development trend of holographic antenna at home and abroad are introduced,and the different construction forms of holographic antenna are analyzed.Through the study of the radiation characteristics and sweeping characteristics of holographic antenna,several typical holographic structures are selected for further analysis The In this thesis,Ansys HFSS software is used to construct the basic holographic antenna structure.Analyze the miniaturized structure of the holographic antenna and study the effective radiation area and the radiation characteristics of the holographic antenna.By designing the holographic antenna with different substrate angles,the optimal holographic structure is selected and optimized by comparing the simulation results,which can effectively reduce the antenna size and improve the antenna gain.In this paper,the design method of several holographic antennas is analyzed by using the phase compensation principle and the theory of holographic antenna.The factors influencing the one-way radiation of the antenna are studied.Then,the holographic antenna Based on the above research,a double-layer holographic antenna with unidirectional radiation is designed.According to the radiation direction of different target antennas,the thickness of the upper and lower dielectric substrate of the holographic antenna is designed according to the design and simulation of the proposed method.This method can make the holographic antenna realize the unidirectional radiation in any direction and effectively enlarge the sweep angle range of the holographic antenna,so as to improve the sweep characteristics and radiation characteristics of the holographic antenna.Based on the theoretical knowledge and research,this paper designs a holographic antenna with miniaturized structure and a Unidirectional radiation double holographic antenna for frequency scanning.The main research contents are as follows:1.In this thesis,the holographic antenna theory is studied deeply,and the holographic antenna with two different directions is used to analyze the energy distribution and radiation characteristics of the holographic antenna.The substrate with different angle is intercepted on the complete holographic structure,and the optimal radiation efficiency is obtained.Holographic substrate angle,to achieve holographic antenna miniaturization.The miniaturized holographic antenna enables the target antenna to increase gain in the main radiation direction and the sidelobe decrease.2.In order to improve the radiation characteristics of the holographic antenna,the relationship between the effective radiation area of the holographic antenna and the radiation characteristics of the holographic antenna is analyzed by using the radiation principle of the leaky wave antenna,and a reasonable optimization scheme is proposed.For the sake of generality,Direction of the holographic antenna to simulate the design to improve the holographic antenna radiation characteristics.3.Aiming at the problem of unidirectional radiation characteristics and frequency scanning characteristics of holographic antenna,two different holographic antennas with different radiation directions are used to improve the thickness of the upper and lower media,and the single radiation characteristics of the holographic antenna are effectively improved.range.By means of overlapping the holographic structure on the upper and lower layers of the dielectric substrate with different thicknesses,the rotation of one of the beams is realized.In the other beam,the effective gain of the two beams is realized,and the gain of the antenna is improved.By changing the operating frequency of the antenna,can achieve the antenna main beam in a certain range of beam scanning.In addition,the simulation results demonstrate the effectiveness of the proposed structure. |
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