Directional coupler and radio-frequency module

Abstract

A directional coupler (10) includes a main line (11), a sub-line (12), and a termination circuit (13) that is connected to one end (121) of the sub-line (12), and further includes an adjustment terminal (ADJ), as a lead-out terminal, that is led out from a node (N) between the one end (121) of the sub-line (12) and the termination circuit (13). The termination circuit (13) may be formed of a circuit in which a capacitance element (131) and a resistance element (132) are connected in parallel with each other, a capacitance value of the capacitance element (131) may be smaller than a capacitance value with which the directivity of the directional coupler (10) is optimized and a resistance value of the resistance element (132) may be larger than a resistance value with which the directivity of the directional coupler (10) is optimized.

Dependencies are inferred from the claim text.