The Research Of High Power Rectenna

Microwave energy transmission system has always been a hot topic in the world.Its energy transmission method truly realizes the wireless connection between the two places.In the past few decades,microwave energy transmission systems have been mainly used for wireless transmission of solar energy.In recent years,its application fields have been broadened,and it is closer to actual production and life.For example,the microwave energy transmission system is used to wirelessly power sensors,the driving of drones,and the power supply of robots.In addition,there are related topics to explore its use of mobile phones.The microwave energy transmission system avoids many disadvantages of wired transmission.The rectenna is an important component of the microwave energy transmission system,and it has also attracted the research of many scholars.This paper designs high-power rectennas on the basis of consulting domestic and foreign literature on rectennas.In the design of the rectifying circuit,the miniaturization of the rectenna,harmonic suppression,and research on the optimal load of the rectennas array are all innovative.The main contents are as follows:Firstly,the principle analysis and simulation verification of the common rectifier circuit are carried out and the double-tube series-parallel circuit is determined as a rectifier circuit.According to the characteristics of Schottky diodes,we determine the type of diode suitable for high-power rectification.On this basis we model Schottky diodes,use ADS simulation software for simulation design,proces and test rectifying circuit.The experimental and simulation results are in good agreement.Second,the idea of designing a rectifier circuit using a field effect transistor is proposed.There is a metal-semiconductor junction between the source and drain of the field effect transistor,so field effect transistor should have a rectifying effect.The simulation is performed in the ADS simulation software,and experimental verification is performed.The experimental results and the simulation results are basically consistent,which proves the correctness of the idea of using the field effect transisitor to design the high-power rectifier circuit.Third,for the above two types of rectifying circuits,equivalent model analysis is performed.Using the results of the test,straight line fitting is performed,and the bestload obtained by the experimental test is basically consistent with the best load obtained by straight line fitting.It laid the foundation for the subsequent optimal load analysis of the rectenna array.Fourth,we design the rectenna using HFSS and ADS software.The receiving antenna of the rectennas adopts a rectangular microstrip patch antenna.and on this basis,a U-shaped slot is opened to achieve harmonic suppression and miniaturization.The two rectenna were tested,and the results showed that the efficiency of the rectenna with harmonic suppression was slightly improved compared with the traditional rectenna.Then the rectennas array is studied.According to the equivalent model of the rectenna unit,the equivalent model of the series and parallel of the rectennas array is obtained.The equivalent model is simplified according to the principle of circuit equivalence to obtain its optimal load.And use ADS simulation software to verify the correctness of the conclusions.