Design Of Rectenna System For Microwave Energy Transmission

With the increasing development of electronic science and technology,people rely more and more on electronic equipment in daily production and life.However,the endurance of electronic devices is always a challenge.There are many inconveniences in the use of traditional wired charging due to the restrictions of terrain and other aspects.Therefore,how to realize convenient charging of various electronic devices,especially terminal devices,has become a new technical research direction.Among them,microwave energy transmission technology is an important subject in this direction.This technology breaks through the limitations of traditional transmission lines and can be applied not only to the energy transmission of daily-use terminal equipment,but also to high-power space energy transmission operations.It also has good prospects for energy supply in some remote areas.In microwave energy transmission technology,transmission efficiency is an important indicator to measure the success of the technology.Especially in high input power and higher frequency environment,how to maintain high efficiency transmission of the system is a challenging issue.This article relies on the “Daily Project” project jointly promoted by Xi'an University of Electronic Science and Technology and the Shaanxi Provincial Government.The project intends to use space solar power plants to convert solar energy to transmit the converted microwave energy through an antenna and receive it on the ground using an antenna array.Then the energy is converted into DC form for output through the rectifier circuit connected to the antenna.This paper designs,processes and debugs the antenna and rectifier module of the ground receiving part.When the working frequency is 5.8GHz,the working state of the rectifier antenna system is studied.The main work includes the following three aspects:First,the structure of the rectifier circuit is designed and optimized.First of all,the diode model was selected and the internal equivalent circuit model of the diode related to it was built under the requirements of the design index.Secondly,In terms of aspect,an eighthwavelength short-circuit structure is adopted for the diode branch structure to replace the input filter part in the traditional rectifier circuit to achieve efficiency improvement.Thirdly,the structure of the output filter is simplified so that it is filtered only at the corresponding point frequency,which reduces the circuit size and further reduces the circuit loss.Finally, after combining the measured results,the matching circuit design was carried out through HFSS.Taking into account the effects of parasitic parameters,metalized vias are used around the circuit to further improve efficiency.Finally,under the condition of 26 d Bm input power of a single rectifier circuit,the simulation terminal achieves 70% rectification efficiency,and 60% rectification efficiency after actual processing and debugging.Second,the relevant DC synthesis is performed at the DC terminal of the rectifier circuit.In this synthesis,the power supply equivalent of the rectifier circuit was first performed in the linear region,and then the related synthesis was carried out through the principle of serialparallel connection of several equivalent power supplies.To divide,use the principle of symmetry to operate modules with the same voltage in parallel,and to operate in series with the same current.After the series and parallel connection of a single quadrant is completed,the synthesis between the quadrants is generally completed.In the end,the entire rectifier antenna system reached a DC output power of 829.50 W,and the series-parallel efficiency reached 79.02%.Third,the receiving antenna array is designed.First,the antenna array is divided according to the power density received by the antennas in different areas.Three corresponding lefthanded circularly polarized air microstrip antennas with different gains are designed.The three antennas use the same antenna unit.In the arrangement,a single antenna element module is used in the central area of the antenna array,a double antenna element module is used in the middle area,and a four antenna element module is used in the edge area.Then the three antenna modules were simulated,processed and tested.The test results are compared with the simulation and the corresponding design requirements are met.Finally,it explains how the antenna array is erected in practice and its structure.Finally,a relatively good design result is achieved.