| 主权项 |
1. A directional coupler comprising:
an input port; an output port; a coupling port; a terminal port; a main line connecting the input port and the output port; and a first subline section and a second subline section each of which is formed of a line configured to be electromagnetically coupled to the main line; and a matching circuit provided between the first subline section and the second subline section, wherein each of the first subline section and the second subline section has a first end and a second end opposite to each other, the first end of the first subline section is connected to the coupling port, the first end of the second subline section is connected to the terminal port, the matching circuit includes a first path connecting the second end of the first subline section and the second end of the second subline section, and a second path connecting the first path and a ground, the first path includes a first inductor, and the second path includes a first capacitor and a second inductor connected in series. |
