Directional coupler integrated with filtering function

The invention discloses a directional coupler integrated with a filtering function, which is characterized in that four L-shaped strip lines and four single-ended short-circuited side coupling strip lines are arranged at four ends of a central coupling strip line, and zero transmission points and matching and isolation adjustment of a main channel and a coupling channel formed by the L-shaped strip lines and the single-ended short-circuited side coupling strip lines are utilized; in combination with the directional coupling effect of the center coupling strip line, the directional coupler integrating the filtering function is formed, and small size, high directionality and simple structure can be taken into consideration. 本发明公开了一种融合滤波功能的定向耦合器，将四条L型带状线与四条单端短路的旁侧耦合带状线置于中心耦合带状线的四端，利用L型带状线与单端短路的旁侧耦合带状线形成的主通道及耦合通道传输零点及匹配与隔离的调节，结合中心耦合带状线自身的定向耦合作用，形成融合滤波功能的与定向耦合器，并且能够兼顾小尺寸、较高的定向性及简单结构。