| 摘要 |
PROBLEM TO BE SOLVED: To provide a directional coupler that has excellent directionality by eliminating a phase difference between a passing phase during operation in an even mode and a passing phase during operation in an odd mode.SOLUTION: A directional coupler is configured such that the coupled line impedance Z1of a coupled line formed by electromagnetically coupling a first main signal line 11 and a first sub-signal line 13 is lower than the coupled line impedance Z2of a coupled line formed by electromagnetically coupling a second main signal line 12 and a second sub-signal line 14. This allows eliminating a phase difference between a passing phase during operation in an even mode and a passing phase during operation in an odd mode. |
