Lumped element filtering directional coupler

The invention discloses a lumped element filtering directional coupler, which is characterized in that a central LC mutual coupling circuit is cascaded with two side LC mutual coupling circuits, four E-type LC circuits are connected to the outer side, and the transmission pole and the transmission zero point of each channel are adjusted by using the side LC mutual coupling circuits and the E-type LC circuits, and the coupling is adjusted by using the central LC mutual coupling circuit. The lumped element filtering directional coupler has the advantages of being high in integration level, small in size, wide in stop band and the like, and meanwhile, the characteristics of broadband work and high frequency selectivity can be considered. 本发明公开了一种集总元件滤波定向耦合器，将中心LC互耦电路与两个旁侧LC互耦电路相级联，四个E型LC电路连接于外侧，利用旁侧LC互耦电路与E型LC电路对传输极点及各通道传输零点的调节，中心LC互耦电路对耦合的调节，以及整体电路对阻抗匹配、定向性的控制和对阻带带宽的拓展，实现了集总元件滤波定向耦合器，具有集成度高、尺寸小及阻带宽等优点，同时能兼顾宽带工作及高频率选择性的特性。