Cross-type directional coupler

A cross-type directional coupler comprising:

• a ground plate electrically connected to a reference potential;
• first and second transmission lines disposed to face each other to be electromagnetically coupled by alternately crossing at a position spaced apart from the ground plate by a first distance in one direction and at a position spaced apart from the ground plate by a second distance greater than the first distance, and alternately crossing at a position spaced apart from the ground plate by a third distance in the other direction and at a position spaced apart from the ground plate by a fourth distance greater than the third distance, each end portion in a length direction forming each of first to fourth ports, and configured to transmit, with respect to input power of a signal input to any one of the first to fourth ports, through power, coupled power, and isolated power to remaining ports, respectively;
• and
• a dielectric having a predetermined dielectric constant and disposed between each of the first and second transmission lines and the ground plate to support each of the first transmission line, the second transmission line, and the ground plate.