.5.8 Ghz Magnetron Design

Magnetron has broad applications in radar, communication, accelerating power, medical devices, home microwave oven and industrial heating for its small size, high efficiency and low cost. 2.45 GHz magnetron has dominated the field of microwave heating. Efficiency and has the inverse relationship between wavelength. 5.8 GHz CW magnetron development has got the attention by researcher. At present, the Matsushita from Japan has successfully developed an 18-vane 5.8 GHz magnetron. Its output power is 700 W, and the efficiency is 50%. In order to fill the gaps in this area, the Media from Guangdong China has decided to formulate research project for 5.8 GHz magnetron. This paper is supported by Guangdong Midea- Electronics University of Science and Technology United Laboratory for the research of 5.8 GHz magnetron's development.In this thesis, the main researching contents are listed as follows:1. The history of the development of magnetron, the status quo and prospect of research are introduced.2. The characteristics of the cold cavity are studied by simulation, which are confirmed by experiment tests. The resonant frequencies for each mode are calculated, vector graphs of high frequency field for theπmode and other adjacent modes are devised, the influence on the mode division by no, single and double interlink are analyzed, respectively. The loaded quality factor are calculated and measured and the effect on the performance of magnetron for which are also studied shortly.3. Magnetic circuit of magnetron are simulated and calculated by FEMM.4. The characteristic of the hot cavity are discussed using particle simulation. The results of output power and efficiency are in agreement with experiments. The influence on the rise and shake time, mode competition, output frequency and stability by cathode current are researched. The Non-uniform magnetic field is studied by particle simulation.5. The output system is introduced, and simulated. The structure of the output system is optimized. The efficiency of the magnetron is improved by the new design of the output system.6. A new type of magnetron is simulated. Cold cavity and hot cavity simulation are studied for helping to develop magnetron with independent intellectual property rights...