DIRECTIONAL COUPLER

摘要

Disclosed is a directional coupler which outputs a first output signal, obtained from a first input signal input from an input terminal, from an I/O terminal, and outputs a second output signal, obtained from a second input signal input from the I/O terminal, from an output terminal. The directional coupler is provided with: a phase shifter no. 1 having one terminal connected to the input terminal, a phase shifter no. 1-1 having one terminal connected to phase shifter no. 1 and the other terminal connected to the I/O terminal, a phase shifter no. 1-2 having one terminal connected to phase shifter no. 1 and the other terminal connected to the output terminal, a phase shifter no. 2 having one terminal connected to the input terminal, a phase shifter no. 2-1 having one terminal connected to phase shifter no. 2 and the other terminal connected to the I/O terminal, and a phase shifter no. 2-2 (122) having one terminal connected to phase shifter no. 2 and the other terminal connected to the output terminal.