This paper presents electromagnetic and particlein-cell (PIC) simulation studies of ring strapped vane resonator of a 2.45 GHz 1-kW magnetron using Computer Simulation technology microwave studio and MAGIC-3-D. The aim was to gain design understanding through the analysis of constituent parts of the resonant system and to deduce results having significant engineering value. The electromagnetic analysis includes modeling the effect of the end-gap length, the straps, the coupling antenna, and the surface roughness of cavity wall on resonant frequency. It was found that a clearance of 4 mm and beyond between cavity resonator and end plate have negligible effect on resonance frequency. Straps influence the resonant frequency of the π mode maximum, and can be used to control and fine tune the resonant frequency of the desired π mode. A surface roughness of 1 μm or more affects the unloaded Q of the resonator cavity adversely. Coupling antenna height is found to play an important role to achieve desired Q l and Q ext for the segment loaded axial extraction of power. The PIC simulation study predicted that the hot resonant frequency differ from cold resonant frequency by ∼9 MHz. The computed frequency, power, and efficiency were found to be 2.462 GHz, 1.3 kW, and 70%, respectively.Index Terms-Cold resonant frequency, electromagnetic and particle-in-cell (PIC) simulation, hot resonant frequency, industrial magnetron, virtual prototyping.
This paper describes a simple approach to electromagnetic design of vane-type resonant system for high-power high-efficient industrial continuous wave (CW) magnetrons. It uses empirical equations in conjunction with normalization techniques to synthesize all the parameters of the resonant structure and then optimize them through simulation using computer simulation technology, microwave studio/ particle studio. A method to select constant parameters in the empirical equations has been proposed and shown to be effective in designing practical high-power CW magnetrons. The approach has been benchmarked by designing and developing a double ring ten-vane resonator for a 10-kW output power at a 2.45 GHz ± 30 MHz frequency CW magnetron with a 75% efficiency. The measured circuit parameters such as π-mode frequency, quality factors, and circuit efficiency were found in good agreement with the computed one validating the effectiveness of the proposed design approach. The particle-in-cell simulation of this magnetron predicted that an output power of 10.98 kW can be achieved with an efficiency of 71.45%.Index Terms-Industrial magnetron, particle-in-cell (PIC) simulation, strap-and-vane resonator, virtual prototyping.
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