双光栅绕射辐射器件谐振腔模式特性研究  

Mode Characteristics of Resonant Cavity in Diffraction Radiation Device with Dual-Grating

作　　者：邓光晟[1,2,3] 杨军[1,2] 阮久福[1,2] 吕国强[1,2,3] 

机构地区：[1]省部共建现代显示技术国家重点实验室特种显示技术教育部重点实验室,合肥230009 [2]合肥工业大学光电技术研究院,合肥230009 [3]合肥工业大学计算机与信息学院,合肥230009

出　　处：《真空科学与技术学报》2014年第4期340-345,共6页Chinese Journal of Vacuum Science and Technology

摘　　要：对双光栅绕射辐射器件谐振结构中的模式分布规律进行了分析,研究了谐振腔的结构参数对腔内电场分布的影响。结果表明,双光栅绕射辐射器件谐振结构中的电场分布受矩形腔宽度的影响显著。特别是在槽高b=λgroove/2情况,绕射辐射器件谐振模式能分解为球-柱开放腔准TEM与矩形腔中TM模式的叠加表示;在该情况下,a=λ/2是槽宽设计的较合理结果。此外,在谐振结构中加入"四分之一波长变换"结构并不能有效增强矩形腔内的电场强度,反而会对谐振腔的谐振模式及工作频率产生影响。The electromagnetic field distribution in the diffraction radiation device with dual-grating was physically modeled and analytically calculated. The influence of the geometry of the resonant cavity on the electric field intensity was evaluated. The calculated results show that the width of a rectangular cavity has a major impact on the electric field in the resonant cavity. For example, when the rectangular cavity has a height of λgroove/2, the resonance mode can be decom- posed into an independent transverse electro magnetic（TEM）mode of the rectangular cavity and aquasi-TEM mode of the spherical-cylindrical open cavity. In addition,the quarter-wave transformer in resonant cavity does not effectively increase the field intensity in the rectangular cavity, but simultaneously affects the electro magnetic resonant mode and operating frequency.

关 键 词：双光栅 绕射辐射器件 谐振腔 模式 

分 类 号：TN129[电子电信—物理电子学]