| Microstrip reflectarray antenna is a new type of antenna structure.With the advantage of high gain,electronic beam scanning,and relatively simple structure,it is applied to all kinds of long distance wireless communication system frequently.This paper takes from the analysis of the basic reflectarray elements,and the research essentially focuses on the function of reflected beam scanning and controllable trace scanning.The first chapter is the general chapter,explain the research background and significance of this part of work.Firstly,the development process of the array antenna is described,and then the recent research status and key research directions of the reflective array are expounded.Finally describing the research content of this paperThe second chapter introduces the working principle and analysis mode of the reflective array.Firstly,the basic theoretical analysis is carried out.Secondly,the modeling and comparison of the microstrip unit simulation and the setting method of the boundary are introduced in detail.Then,the phase-shifting principle and the merits of the common microstrip structural elements are expounded,to lay the foundation to the terahertz elements used in the next chapter.In the third chapter,after the discussion of the previous chapters,a new type of multi-resonant monolayer microstrip element with a frequency range of 225 GHz ~ 315 GHz is proposed and analyzed in detail.It has good linear phase shift characteristics and large Phase shift range.Then,the steps of the array are described.Finally,the beam scanning range which can be realized by the array is discussed,and several conditions can be put forward that the corresponding relationship between the scanning angle and the frequency can be realized.The fourth chapter is the focus of this paper.According to the theory proposed in Chapter 3,the optimization program is designed to obtain the interval of the scanning angular frequency relationship that can be realized when the upper chapter is used.Then,according to the calculated results,a set of theoretical feasible scanning relationship is selected to carry out the design and implementation,and the physical processing and experimental test are carried out.The test results are in good agreement with the simulation results.In the frequency range of 225 GHz ~ 315 GHz,the gain range is 21.03 ~ 26.12 d dBi.Then,the design of the frequency scanning controllable trajectory reflection array is carried out.A circular scanning trajectory scanning array is designed using the unit described in Chapter 3.In the 225 GHz ~ 315 GHz frequency range to achieve the pitch angle fixed 10 °,while the azimuth angle from 65 ° to 120 ° scan function.The fifth chapter discusses the design of the lens from the reflective array theory,combined with the lens design concept,for the current application of the field of communication requirements,the design of two adjustable phase compensation of the plane lens unit,the first microstrip laminated patch Non-resonant structural elements,with the filter theory to achieve passband and phase shift,can achieve ± 35 ° scan range.The second unit is phase-adjusted using a phase-shifted line by means of a transceiver antenna design and a large-angle beam scanning planar lens is designed using this element.The lens operates at 1.7GHz ~ 2.2GHz,by changing the feed angle of injection,can achieve large scanning range.Chapter 6 summarizes the work of this paper and looks forward to the future work direction. |
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