基于枝节加载技术的宽带分支线耦合器  

Broadband Branch-line Couplers Based on Stub-loading Technique

作　　者：王兵凯 李斌 魏浩 兰宝岩 唐陆瑶 WANG Bingkai;LI Bin;WEI Hao;LAN Baoyan;TANG Luyao(National Engineering Research Center of Communication Software and Asic Design,The 54 th Research Institute of CETC,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团公司第54研究所通信软件与专用集成电路设计国家工程研究中心,石家庄050081

出　　处：《计算机测量与控制》2025年第4期192-199,共8页Computer Measurement &Control

摘　　要：针对当前通信系统对宽频带和高平坦度耦合器的需求,设计了一款基于枝节加载技术的新型宽带分支线耦合器;在对耦合器奇偶模分析过程中将奇偶模模型视为枝节滤波器,在模型端口引入半波长微带线,显著提高了奇偶模模型的带宽和平坦度;将该优化方案代入耦合器本体,有效提升了耦合器的带宽;同时为了控制耦合器的尺寸,采用枝节加载技术等效替换耦合器微带线与加载线,在提升耦合器带宽的前提下有效控制了耦合器的尺寸,在此基础上通过弯曲传输线保证电路结构的紧凑进一步控制耦合器尺寸;通过电磁仿真软件进行优化设计,所得的耦合器在2.58~3.12 GHz带宽内平坦度低于0.4 dB,回波损耗大于20 dB,带内耦合端口与直通端口的输出信号幅度差异不超过0.34 dB,且相位差处于90°±2°之间。耦合器尺寸约为22.64 mm*19.63 mm,对所设计的耦合器进行实物加工测试,测试结果与设计仿真结果较为贴近,证明了设计的有效性。In response to the requirement of current communication systems on wide bandwidth and high flatness couplers,this paper presents a new wideband branch-line coupler based on stub-loading technology.During even-odd mode analysis,the even-odd mode model is treated as a stub filter.Half wavelength microstrip lines are introduced at the model ports to significantly improve the bandwidth and flatness of the even-odd mode model.This optimization scheme is then applied to the coupler body,effectively enhancing the bandwidth.And then,to control the size of the coupler,the stub-loading technology is used to equivalently replace the microstrip line and loading line of the coupler.This method effectively controls the size while improving the bandwidth.On this basis,using bent transmission lines ensures a compact circuit structure,further controlling the size of the coupler.Through optimization design of electromagnetic simulation software,the obtained coupler achieves a flatness of below 0.4 dB and a return loss greater than 20 dB within the bandwidth of 2.58 GHz to 3.12 GHz,The output signal amplitude difference between the coupling port and direct port does not exceed 0.34 dB,with a phase difference within 90°±2°.The coupler size is 22.64 mm*19.63 mm(approximately 0.5λ*0.5λ).The designed coupler is processed and tested,and the results are consistent with the designed results,proving the effectiveness of the designed coupler.

关 键 词：枝节加载 宽带 分支线耦合器 平坦 奇偶模分析 

分 类 号：TN622[电子电信—电路与系统]