Matsushima, Takaaki

Kyoto University Research Information Repository

TitleStudy on Pulse-driven Phase ControlledMagnetron(ABSTRACTS (MASTER THESIS FORGRADUATE SCHOOL OF ENGINEERING))Author(s)Matsushima, TakaakiCitationSustainable humanosphere : bulletin of Research Institute forSustainable Humanosphere Kyoto University (2006), 2: 48-48Issue Date2006-08-31URL http://hdl.handle.net/2433/51121RightType Departmental Bulletin PaperTextversionpublisherKyoto University------------------ ----_._---_._-------Study on Pulse-driven Phase Controlled MagnetronTakaaki MatsushimaGraduate School ofEngineering, Kyoto UniversityThe object of the present study is to develop a pulse-driven PCM(Phase Controlled Magnetron). A PCMhas been originally developed for a microwave source of a microwave power transmission system. Thepulse-driven PCM for radar systems has a possibility for an additional application. Also, a key feature ofthe pulse-driven PCM is adjustment of the output microwave power by pulse width control. Compared tosemiconductor devices, a PCM is efficient, inexpensive and light. However the previous PCMs are drivenin CW mode and they need three second to control the phase. Therefore, the response time of the PCMs isnecessary to be improved to develop a pulse-driven PCM and high-speed beam directional control for amicrowave power transmission system.The PCM developed by our study group can stabilize its phase and its oscillating frequency by combinationof the injection locking method and controlling anode current of the magnetron with a PLL(Phase-LockedLoop) technique.First, we experimentally succeeded in a high-power microwave beam forming with SPORTS2.45 (SpacePOwer Radio Transmission System for 2.45GHz). We also analyzed the effect of phase fluctuation onmicrowave beam pattern.Next, we optimized a PLL system of the previous PCM. Response time of the optimized PCM is about1.6ms. Furthermore, we designed a new phase control system for a high voltage power supply with quickresponse time and succeeded in speed-up of the phase control system. As the result, the response time isimproved to be about 0.2rns.Finally, we developed a kHz-class pulse-driven PCM by the improved PCM. The pulse-driven PCM wasable to stabilize its phase within 0.1 ms in most pulses. Furthermore, we suggested a MHz-class PCMcontrol system, which is designed with a standard weather radar system.48

Study on Pulse-driven Phase Controlled Magnetron(ABSTRACTS (MASTER THESIS FOR GRADUATE SCHOOL OF ENGINEERING))

http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/51121/1/KJ00004529270.pdf

Study on Pulse-driven Phase Controlled Magnetron(ABSTRACTS (MASTER THESIS FOR GRADUATE SCHOOL OF ENGINEERING))

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