| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact directional coupler having a high directionality.SOLUTION: The directional coupler includes a dielectric substrate 10, a main line 11 formed on the surface of the dielectric substrate 10, a sub-line 12 formed on the front or back surface of the dielectric substrate 10, while spaced apart therefrom in the plan view of the dielectric substrate 10, and an aperture 14 provided between the main line 11 and sub-line 12 so as to penetrate the dielectric substrate 10. |
