A stripline forward-wave directional coupler is proposed using periodical double multi-via mushroom structures and short-circuited branch lines in this paper. By adding the short-circuited branch lines to the coupled lines and the patch of the upper or lower mushroom structure, the operating bandwidth is enhanced for the unit cell design. The even/odd mode phase difference of one unit cell is located within 20 ~ 30° from 6.1 to 6.7 GHz with an acceptable even/odd mode Bloch impedance mismatching. Finally, a prototype is fabricated by multi-layer printed circuit broad technology and measured. The agreement is achieved between the simulated and measured results.

中文翻译：

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基于双多通孔蘑菇短路支线的带状线前向耦合器

本文提出了一种采用周期性双多通孔蘑菇结构和短路支线的带状线正向波定向耦合器。通过在耦合线和上或下蘑菇结构的贴片中添加短路的支线，提高了单元电池设计的工作带宽。一个单元的偶/奇模相位差位于 6.1 至 6.7 GHz 的 20 至 30° 内，具有可接受的偶/奇模 Bloch 阻抗失配。最后，通过多层印刷电路广泛技术制作原型并进行测量。模拟结果和测量结果之间达到了一致。