微带-槽线转换结构的数值分析  

Numerical analysis of microstrip-slotline transitions

作　　者：高昕[1] 宣晓峰[1] 张瑞[1] 姜万顺[2] 杨明武[1] 

机构地区：[1]合肥工业大学电子科学与应用物理学院,安徽合肥230009 [2]中国电子科技集团公司第41研究所,山东青岛266555

出　　处：《合肥工业大学学报（自然科学版）》2010年第7期1090-1093,共4页Journal of Hefei University of Technology：Natural Science

基　　金：电子测试技术国家重点实验室测试仪器基础研究资助项目

摘　　要：文章利用FDTD算法对微带-槽线正交背靠背转换结构进行了仿真模拟,提取了0-10 GHz频率范围内传输系数和反射系数,所得结果与HFSS仿真软件图形具有较好的一致性,与等效电路理论的结果接近,表明方法可靠有效;计算得到该模型的中心频率为5.1 GHz,100.73%的相对带宽内插入损耗小于1.3 dB,同时建立了等效电路模型并与电磁仿真结果进行比较;改变槽线宽度进行FDTD仿真,绘制S21（Ws,f）曲面图观察功率传输随槽宽的变化规律,对目标函数进行优化并得到了优化槽宽,进一步分析得出转换结构的中心频率和通频带带宽对于槽宽的变化不敏感。In this paper,the FDTD method is applied to simulate a back-to-back microstrip-slotline transition in which the slotline is crossed at a right angle by a microstrip conductor on the opposite side.The transmission and reflection coefficients from 0 GHz to 10 GHz are extracted.The validity of the method is verified by the good consistency with the graphics achieved by using software HFSS and the approximated results of equivalent circuit theory.The central frequency of the model is 5.1 GHz and an insertion loss of less than 1.3 dB is achieved over a relative bandwidth of 100.73 %.Equivalent circuit model is established and the comparison with electromagnetic simulation results is made.Transitions with different slotline widths are also simulated.The surface of S21（Ws,f） is given to observe the variation tendencies of transmitted power via the slotline width.The objective function is applied to optimize the structure and obtain optimized slotline width.Through further analysis,the conclusion is made that the central frequency and bandwidth of the transition are not sensitive to the slotline width.

关 键 词：微带-槽线转换 FDTD算法 散射参数 相对带宽 

分 类 号：O451[理学—无线电物理]