In this paper, a wideband quadrature hybrid coupler is presented. The proposed structure has a multi-layer microstrip topology. In this topology, there are three substrate layers including prepreg material and four conductive layers. In order to achieve equal power division between through and coupled arms of the directional coupler while maintaining a 90° phase shift, aperture coupling between the resonators located at both top and bottom layers is utilized. So as to avoid any unwanted effects of prepreg material in such multilayer topology, via shielding around resonators are inserted. In this study, coupling from input ports to output ports is accomplished by the shielded butterfly shaped slot etched to the ground layer of top and bottom layers. The proposed design operates within 3–12 GHz. The acquired phase imbalance between the coupled ports is <±2.5°. The results of the manufactured quadrature hybrid coupler agree well with the simulated results.

本文提出了一种宽带正交混合耦合器。所提出的结构具有多层微带拓扑。在这种拓扑结构中，有三个基板层，包括预浸材料和四个导电层。为了在定向耦合器的直通臂和耦合臂之间实现相等的功率分配，同时保持 90° 相移，利用位于顶层和底层的谐振器之间的孔径耦合。为了避免预浸材料在这种多层拓扑结构中的任何不良影响，在谐振器周围插入了屏蔽层。在这项研究中，从输入端口到输出端口的耦合是通过蚀刻到顶层和底层接地层的屏蔽蝶形槽来实现的。建议的设计在 3–12 GHz 范围内运行。耦合端口之间获得的相位不平衡 <±2.5°。制造的正交混合耦合器的结果与模拟结果吻合良好。