| 摘要 |
<p>Provided is a directional coupler (10a) used in a predetermined frequency band. A main line (M) is connected between a first terminal (14a) and a second terminal (14b). A first sub line (S1) is connected to a third terminal (14c) and is electromagnetically coupled to the main line. A second sub line (S2) is connected to a fourth terminal 14d) and is electromagnetically coupled to the main line. A low pass filter (LPF1) is connected between the first sub line and the second sub line and causes a phase shift to be generated in a passing signal passing therethrough in such a manner that the phase shift monotonically increases within a range from about 0 to about 180 degrees with increasing frequency in the predetermined frequency band.</p> |
