双枝节加载的L波段宽带高隔离度定向耦合器  

Dual-branch loaded L-band broadband high isolation directional coupler

作　　者：马壮 周东方[1] 张德伟[1] 张毅[1] 吕大龙[1] Ma Zhuang;Zhou Dongfang;Zhang Dewei;Zhang Yi;LüDalong(Information Engineering College,PLA Strategic Support Force Information Engineering University,Zhengzhou 450001,China)

机构地区：[1]战略支援部队信息工程大学信息工程学院,郑州450001

出　　处：《强激光与粒子束》2022年第4期50-55,共6页High Power Laser and Particle Beams

基　　金：国家科技重大专项项目。

摘　　要：提出了一种小型化双枝节加载的L波段微带线定向耦合器。使用功率相消技术提高定向耦合器的隔离度,并且采用两根长度不同的加载枝节分别在两个相近的频点上反射信号,从而实现耦合器的带宽扩展;同时采用缺陷地结构的慢波特性减小该定向耦合器的物理尺寸,并利用缺陷地结构产生的陷波,合并上述两根枝节反射抵消产生的的两个陷波,进一步提高定向耦合器的带宽和隔离度。该耦合器工作在L波段,耦合度约为10 dB,在整个L波段内的隔离度均优于-20 dB,最大约为-52.81 dB,相对带宽为60%。最后对设计的定向耦合器进行加工和测试,测试与仿真结果一致性较好,证明了该电路的可行性。This paper presents a miniaturized L-band microstrip line directional coupler loaded with double branches. Power cancellation technology is used to increase the isolation of the directional coupler, and two loading branches with different lengths are used to reflect signals at two similar frequency points respectively, so as to realize the bandwidth expansion of the coupler;at the same time, the slow wave characteristics of the defective ground structure are used to reduce the physical size of the directional coupler, and the notch generated by the defective ground structure is used to combine the two notch waves generated by the reflection of the two branches to further improve the bandwidth and isolation of the directional coupler. The coupler works in the L-band, the coupling is about10 dB, the isolation in the entire L-band is better than-20 dB, and the maximum is about-52.81 dB, and the fractional bandwidth is 60%. Finally, the designed directional coupler is processed and tested, and the test and simulation results are in good agreement, which proves the feasibility of the circuit.

关 键 词：定向耦合器 隔离度 相对带宽 功率相消 缺陷地结构 

分 类 号：TN715[电子电信—电路与系统]