具有坡度的同轴布喇格结构的频率响应特性  

Characteristics of frequency response in a coaxial Bragg structure with tapered ripples

作　　者：丁学用[1] 张世昌[1] 谢永超[1] 

机构地区：[1]西南交通大学光电子学研究所,成都610031

出　　处：《强激光与粒子束》2008年第12期2051-2054,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(60870123)

摘　　要：在CST软件平台上,对具有坡度的同轴布喇格结构的频率响应特性进行了数值模拟。结果表明:具有正圆锥形坡度的同轴布喇格结构,其带宽随着所加坡度角的增大而变窄;而具有倒圆锥形坡度的同轴布喇格结构,其带宽随着所加坡度角的增大而变宽。采用窗函数技术可以有效地抑制具有坡度的同轴布喇格结构的频率响应曲线的残余旁瓣。汉明窗函数、汉宁窗函数及布拉克曼窗函数均有利于改善同轴布喇格结构作为反射器或者滤波器的性能。Based on the CST software, numerical simulations are carried out for the frequency response in a coaxial Bragg structure with tapered ripples. The bandwidth of the coaxial Bragg structure with positive taper can be narrowed by increasing the tapering angle, whereas the bandwidth of the coaxial Bragg structure with negative taper can be expanded by increasing the tapering angle. The residual side-lobes of the frequency response can be effectively suppressed by employing the window function technique, using Hanning, Hamming and Blackman window functions. These characteristics of a tapered coaxial Bragg structure are favorable to improvement of its performance as a reflector or a filter.

关 键 词：高功率微波 同轴布喇格结构 坡度正弦波纹壁 残余旁瓣 窗函数 

分 类 号：TN129[电子电信—物理电子学]