Design And Experimental Study Of S-band High-power Magnetron

As a small,efficient and low-cost microwave power source,magnetron has a wide range of applications in communications,radar,medical equipment,household microwave ovens and industrial heating.In recent decades,microwave ovens have become an important household appliance in people’s daily lives.At present,the market demand for microwave oven magnetrons is large and the economic benefits are high,the annual output of magnetrons has reached more than 60 million,China has become the world’s largest number of microwave oven magnetrons to reach the country.Therefore,is very necessary to study magnetrons for microwave ovens.In order to explore the higher power-to-volume ratio in a single volume,this paper designs an S-band high-power magnetron with a similar volume and the same operating frequency as a magnetron for microwave ovens,but can provide higher output power.The main work of this article is as follows:1.The development history and research status of magnetron are introduced.In addition,the structure and working principle of the magnetron are briefly introduced.2.The resonant system of S-band high-power magnetron is designed by combined with the theory.Use CST software to model and simulate the 10-cavity resonant system.From the simulation results,it can be seen that the operating frequency of the magnetron designed in this thesis is about 2.46 GHz.In addition,the electric field distribution of the magnetron tube can also be obtained from the simulation results of CST.3.Model and PIC simulate the S-band high-power magnetron.Usually the working voltage of the magnetron for microwave oven is about 4 kV,the working magnetic field is 0.17 T,the working frequency is 2.458 GHz,and the output electronic efficiency is about 70%.According to the magnetron B-V curve,the influence of different voltages on the output power and output efficiency of the magnetron was analyzed,and the final working voltage of the S-band high-power magnetron was determined to be 7.8kV and the working magnetic field was 0.32 T.From the simulation data,the magnetron output power is 12.6 kV,the operating frequency is 2.4624 GHz,and the output electronic efficiency can reach 90.25%.4.Design a magnetic circuit system that provides an operating magnetic field for Sband high-power magnetrons.The CST software is used to model and simulate,determine the final size and structure of the magnetic circuit system,and set the residual magnetic field size of the toroidal magnet to 1.1T to obtain the central magnetic field distribution of the magnetic circuit system.The magnetic circuit system designed in this thesis designs the left and right iron brackets as 10 removable magnetic stripes,which can not only change the size of the magnetic field in the provided magnetron interaction space when different numbers of magnetic strips are placed,but also have better heat dissipation.The central magnetic field measurement of the processed magnetic circuit system entity was carried out by Gaussian meter and displacement table,and the magnetic field measurement data were obtained,and the experimental data showed that the magnetic circuit system could provide a magnetic field of 0.32 T.The magnetic circuit system is combined with a magnetron,which is experimentally tested and concluded.