光子晶体谐振腔的研究设计

【作者】 王雷雷；

【导师】 罗勇；

【作者基本信息】 电子科技大学 ， 物理电子学， 2011， 硕士

【摘要】 随着回旋管向高频阶段发展,高次的谐波互作用研究已经成为成为重要方向。但是高次谐波的互作用有以下几个缺陷：互作用效率随着谐波次数的升高而迅速下降；同步范围窄,各项参数需要做进一步调整；不同的模式之间竞争严重。当普通的回旋管工作在高频时,效率很低,尤其是模式之间的竞争问题较难解决。因为基波和低阶谐波起振电流小,容易被激励,抑制了高次谐波振荡,因此,必须改进结构以抑制模式竞争、除去杂模,这样才能够有效地实现高次谐波互作用。上世纪八十年代中期,一种新的概念“光子晶体”被提出。它是一种由介质或者金属通过周期性排列而构成的一种人工材料,其最根本的特性是具有光子带隙。光子带隙的存在使得光子晶体拥有了频率选择特性,可以有效的对非工作模式进行抑制,实现单模传输的效果。这为解决高频结构的上述种种问题提供了可能。本文首先简单介绍了光子晶体的基本概念,然后通过时域有限差分法对两种基本模式下光子晶体禁带进行了分析计算。然后,根据所得的能带结构图,通过HFSS仿真,设计出了两种工作在我们所需频段且单模工作的光子晶体谐振腔。更多还原

【Abstract】 According to the resonance condition for the excitation, the static axial magnetic field has inverse proportion of the cyclotron harmonic number. The static axial magnetic field will much be reduced, if operation frequency is in the harmonic state So harmonic wave interaction researches become more and more very important, with the development of gyrotrons. There are several disadvantages by the above merit, with the cyclotron harmonic number:The interaction effect falls much. The bandwidth becomes small, which needs modify the parameters continually. Mode competition upgrades. Special structure shall be promoted to solve these problems.The Photonic crystal is a new subject developed from 80 years of twentieth century. It is an artificial structure which has a periodic arrangement of metallic or dielectric materials. The greatest feature of Photonic crystal is the band structure, which makes it has the frequency selective characteristic. We may save these problems mentioned in the first paragraph.We first introduce the general idea of Photonic crystal. Then we use The Finite Difference Time Domain method to discuss two basic kind of geometry structure. After calculating the triangle lattice and square lattice we design two PBG resonators for Gyro klystrons working with single mode transmission and verify the result by HFSS.更多还原