| With the rapid development of electromagnetic theory and technology,it has been widely used in tumor ablation,near-field scanning,information-energy co-transmission,near-field wireless energy transmission and other fields.How to control the distribution of electromagnetic field in space has become an important research of electromagnetic theory and technology.The study of electromagnetic shaper technology cannot be separated from the verification of field shaper effect.In current experiments of electromagnetic field shaper regulation,the effect of field shaper is usually obtained through the movement of probe or antenna in space and observation by connecting vector net or power meter.This method is complex and not intuitive,so a simple and intuitive observation method is needed to show the effect of field shaping.Based on the basic electromagnetic principle,the miniaturized rectifying antenna array is used in this study to visually demonstrate the electromagnetic field shaping effect.The details include:Firstly,the basic theory of antenna and the common analysis method of microstrip antenna are introduced.Then,the core component of the rectifier circuit Schottky diode is modeled to analyze the influence of the diode parameter change on the rectifier circuit,and several common rectifier circuit structures are introduced.At the same time,the theoretical rectification efficiency of series structure rectifier circuit is theoretically derived by using the two-terminal network model.Secondly,several commonly used microstrip antenna miniaturization methods are introduced,and the principles,advantages and disadvantages of three microstrip antenna miniaturization technologies,"using high dielectric constant material as microstrip antenna dielectric substrate","short-circuit needle loading technology" and "meanderingflow technology",are theoretically analyzed.Then,the effect of dielectric constant of microstrip antenna dielectric substrate on antenna miniaturization and antenna performance were explored,and a miniaturized microstrip antenna working at 2.45 GHz using TP-2 material as dielectric substrate was designed,the size of which was reduced by 49.8% compared with that of ordinary microstrip antenna.The effect of the number and position of short-circuit needles on the miniaturization of microstrip antenna and the effect on the performance of the antenna were investigated,and a miniaturized microstrip antenna loaded with three short-circuit needles was designed.The size of the miniaturized microstrip antenna was reduced by63.4% compared with that of ordinary microstrip antenna.The effects of slot shape,position and number of microstrip antenna radiation patch on miniaturization of microstrip antenna and antenna performance were investigated,and a rectangular slot miniaturized microstrip antenna was designed,the size of which was 44.3% smaller than that of ordinary microstrip antenna.Then,a miniaturized microstrip antenna is designed by using the above three miniaturization methods,and its size is reduced by 83.8%compared with that of ordinary microstrip antenna.Finally,a small size lumped parameter series structure rectifying circuit working at2.45 GHz is designed,and the rectifying circuit is loaded onto the miniaturized microstrip antenna to form a planar array rectifying antenna unit.Then the rectenna array element is composed of 4×4 array for simulation,and the antenna position plate slot is de-coupled between elements.Finally,the antenna array is processed and tested,and the visual microwave rectifying planar antenna array is realized. |
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