基于介质集成悬置线的W波段功分器设计

Design of W-band Power Divider Based on Substrate Integrated Suspended Line

介质集成悬置线(SISL)具有低损耗、高品质因数的特点,在毫米波电路设计中具有广阔的应用前景。基于上述特点,本文提出了一种采用SISL结构的W波段功分器,主要由十字型谐振器和输入输出耦合线构成。通过对十字型谐振器进行奇偶模分析,得到了谐振频率与谐振器臂长的关系,功分器工作带宽可以通过调整谐振器臂长来设计。论文提出了端口加载高阻抗线结构,用以提高端口与谐振器之间的耦合,便于实际加工。最后给出了功分器的结构参数,并对其进行仿真优化,仿真结果显示,在77-87GHz频段内回波损耗均小于-10dB,插入损耗小于0.5dB,S_(21)与S_(31)完全重合。

Substrate integrated suspended line(SISL)has the characteristics of low loss and high quality factor,and has a broader application prospect in millimeter wave circuit design.Based on the above characteristics,this paper proposes a W-band power divider using SISL structure,which is mainly composed of a cross-shaped resonator and input and output coupled lines.By analyzing the odd and even modes of the cross-shaped resonator,the relationship between the resonant frequencies and the lengths of the resonator arms are obtained,so the working bandwidth of the power divider can be designed by adjusting the length of the resonator arm.The paper proposes a port-loaded high-impedance line to improve the couplings between the ports and the resonator,which is convenient for actual processing.Finally,the design parameters of the power divider are given,and the optimization is carried out.The simulation results show that the return loss is less than-10 dB from 77-87 GHz,the insertion loss is less than 0.5 dB,and S_(21) and S_(31) overlap completely.