Liao Xiaoyi, Yang Rongyu, Zheng Yongheng, Qian Xiangcheng, Zhao Chen
School of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing, Jiangsu Province 210044, China.
Rev Sci Instrum. 2024 Dec 1;95(12). doi: 10.1063/5.0230286.
A waveguide branch-line crossover with broad bandwidth is designed for beam-forming networks in millimeter wavebands. To realize the power coupling between two parallel branch lines, a substrate with metal gratings patched replaces the common E-plane waveguide wall. Compared with the traditional crossover with coupling vias, the metal gratings achieve continuous and efficient power coupling, endowing the proposed crossover with advantages in compactness and broad bandwidth. A simulation-assisted transfer-matrix approach is used to rapidly estimate and optimize the parameters of the crossover. The coupling obtained from the simulation is over -0.5 dB from 32.1 to 39.1 GHz, with isolation greater than 15 dB and reflection less than -20 dB. A prototype is fabricated, and the measurement results agree with the simulation results, demonstrating that the proposed crossover is a promising candidate for millimeter-wave beamforming networks.
本文设计了一种用于毫米波频段波束形成网络的具有宽带宽的波导分支线耦合器。为了实现两条平行分支线之间的功率耦合，采用了带有金属光栅贴片的基板来替代普通的E面波导壁。与传统的带有耦合通孔的耦合器相比，金属光栅实现了连续且高效的功率耦合，使所提出的耦合器在紧凑性和宽带宽方面具有优势。采用仿真辅助转移矩阵方法来快速估计和优化耦合器的参数。仿真得到的耦合在32.1至39.1GHz范围内超过-0.5dB，隔离度大于15dB，反射小于-20dB。制作了一个原型，测量结果与仿真结果相符，表明所提出的耦合器是毫米波波束形成网络的一个有前途的候选方案。
