摘要
基于多模耦合理论,利用三维电磁仿真软件CST对毫米波双内导体和三内导体布喇格结构电磁特性分别进行了比较研究。结果表明:双内导体布喇格结构相比同轴布喇格结构可以抑制竞争模式,反射率稳定并接近1,对称性结构电磁特性优于非对称性结构;随着内导体距离同轴轴心距离的增大,双内导体布喇格结构频率响应带宽变宽,且当内导体距离同轴轴心距离较远时,带宽变宽趋势明显,而反射率值趋于稳定;对于三内导体布喇格结构,随着内导体距离同轴轴心距离的增大,频率响应带宽变窄,且当内导体距离同轴轴心距离较近时,带宽变宽趋势明显。因此,可根据实际需要恰当选择毫米波多内导体布喇格结构参数,拓宽其作为反射器或者滤波器的性能,提高模式的选择性及模式的纯度,改善布喇格结构的性能。
Based on the theory of multimode coupling,the electromagnetic characteristics of the millimeter wave Bragg structure with double inner conductors and three inner conductors are compared by using the 3D electromagnetic simulation software CST.The results show that the double inner conductor Bragg structure can suppress the competitive mode compared with the coaxial Bragg structure,the reflectivity is stable and close to 1,and the electromagnetic characteristics of the symmetric structure is better than the asymmetric structure;With the increase of the distance between the inner conductor and the coaxial axis,the bandwidth of the double inner conductor Bragg structure frequency response becomes wider,and when the inner conductor is far from the coaxial axis,the bandwidth becomes wider obviously,while the value of reflectivity tends to be stable;For the three inner conductor Bragg structure,the frequency response bandwidth narrows with the increase of the distance between the inner conductor and the coaxial axis,and the bandwidth widens obviously when the inner conductor is close to the coaxial axis.Therefore,the Bragg structure parameters of millimeter wave inner conductor can be properly selected according to the actual needs to broaden its performance as a reflector or filter,improve the selectivity and purity of the mode,and improve the performance of the Bragg structure.
作者
丁学用
王石峰
王连胜
袁帅
DING Xueyong;WANG Shifeng;WANG Liansheng;YUAN Shuai(The Polytechnic Institute of San Ya University,Sanya 572022,China;The Institute of Marine Communications of San Ya University,Sanya 572022,China)
出处
《电波科学学报》
CSCD
北大核心
2024年第1期142-147,共6页
Chinese Journal of Radio Science
基金
海南省自然科学基金(620MS063)
海南省重点研发计划(ZDYF2020196)
三亚市院地科技合作项目(2018YD03)。
关键词
同轴布喇格结构
双内导体结构
三内导体结构
频率响应
电场分布云图
coaxial Bragg structure
double inner conductor structure
three inner conductor structure
frequency response
electric field distribution nephogram