波纹误差对同轴布拉格结构反射特性的影响

利用模式匹配法建立了分析波纹参数具有随机误差的矩形槽同轴布拉格结构反射特性的理论模型，并以一个以基模（TEM）工作于220 GHz附近的矩形槽同轴布拉格结构为例，研究了矩形凹槽的深度、宽度、周期长度以及位置的随机误差对其反射率频率响应的影响。数值模拟结果表明：在给定的误差范围条件下，凹槽宽度与位置的随机误差对该结构的反射性能影响较小，而凹槽深度与周期长度的随机误差是影响结构反射特性的主要因素，因此在结构的加工制备过程中应视器件性能要求严格控制两者的制造公差。

Effect of random corrugation errors on reflection characteristics of coaxial Bragg structure with rectangular ripples

By using the mode-matching method, a theoretical model is presented to analyze the reflection characteristics of the coaxial Bragg structures corrugated with rectangular ripples, where the inner-rod and outer-wall ripples have random parameters due to fabrication error. Numerical simulations are carried out to investigate the effect of the errors of the corrugated depth, corrugated width, length of period and ripple position on the reflectivity frequency response for a coaxial Bragg structure which operates with TEM mode in the vicinity of 220 GHz. Numerical results reveal that, with a given range of error values, the random errors of corrugated width and ripple position have less influence on the reflection spectrum, while the random errors of corrugated depth and length of period critically affect the reflection properties of the example structure. Therefore, the manufacturing tolerances of these two parameters should be strictly controlled in accordance with the performance of the devices employed with coaxial Bragg structures. The theoretical model as well as the corresponding numerical code may provide engineering references for further applications of the coaxial Bragg structure with rectangular ripples.