| Summary: | 碩士 === 國立臺灣大學 === 物理學研究所 === 107 === Researches of Open Cavities are commonly used in gyrotrons and gyromonotron oscillators. Different from the enclosed cavities, it has well-defined geometrical boundary conditions. There are mainly two kinds in previous researches. One is under Time-Domain, analyzing and discussing the relation of different quality factor Q and resonant frequency with the basic structure or changing the structure or the material of the cavities. The other is under Frequency-Domain, injecting electromagnetic waves with different frequency. Then, observe and discuss the relation of coefficient and the injected frequency.
The main result of this thesis is developed from the previous researches of Time-Domain. Basic from the knowledges of Electrodynamics, we denote the average value of the Poynting vector in the z-direction among a period as the net wave power flowing. Also, changing the structure, analyze the power flow of the wave with numerical simulations. Lastly, we give reasonable physical explanations in this thesis.
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