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Design of wideband directional coupler based on secondary stage coupled structure
Microwave and Optical Technology Letters ( IF 1.5 ) Pub Date : 2021-01-05 , DOI: 10.1002/mop.32775
Dun Wei Liao 1 , Yun Qi Fu 1
Affiliation  

A wideband directional coupler based on secondary coupled structure is presented and implemented in this paper. The proposed coupler is formed by two stepped‐impedance shaped microstrip and parallel coupled‐lines with a stepped rectangular slot in a common ground plane. The phase velocity differences between the even‐ and odd‐modes of the coupler are compensated by introducing broadside principal coupling and parallel‐line secondary coupling structures, which can achieve a flat coupling without any enlarging the size of the coupler. The simulation results show that the designed device exhibit a coupling of 3 ± 1 dB across the 2.3–11.8 GHz band, which obtained a wideband over 5‐octave wider than other couplers. In order to demonstrate the effectiveness of the design, a prototype is fabricated and measured. The measured results reveal a coupling of 3 ± 1 dB across the 2.7–11.1 GHz band, which also show good performance.

中文翻译:

基于次级耦合结构的宽带定向耦合器设计

提出并实现了一种基于次级耦合结构的宽带定向耦合器。拟议的耦合器是由两条阶梯状阻抗微带线和平行耦合线组成,并在公共接地平面上有一个阶梯状矩形槽。耦合器偶数模式和奇数模式之间的相速度差可通过引入宽边主耦合和平行线次级耦合结构来补偿,这可以实现平坦耦合,而无需扩大耦合器的尺寸。仿真结果表明,所设计的器件在2.3-11.8 GHz频带范围内表现出3±1 dB的耦合,与其他耦合器相比,它获得了5倍频程的宽带。为了证明设计的有效性,制造并测量了原型。
更新日期:2021-01-05
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