A coupled-line coupler having a coil in one of the coupled lines may include first and second conductors having at least first and second coupled sections in which the first and second conductors are closely coupled. A coil extending around an axis may be formed in the first conductor. At least a portion of the coil may be between the first and second coupled sections. A first portion of the first conductor may cross over a second portion of the first conductor when viewed along the axis. At least a first capacitor may be connected between a circuit ground and the first conductor at a position of the coil between and spaced from the first and second coupled sections.