| 摘要 |
<p>The purpose of the present invention is to have more even performance in the degree of coupling in a directional coupler. A low-pass filter (LPF1) includes a coil (L1) connected between an external electrode (14a) and a main track (M) and has a property that attenuation increases as frequency increases in a given frequency band. A low-pass filter (LPF2) includes a coil (L2) connected between an external electrode (14b) and the main track (M) and has a property that attenuation increases as frequency increases in a given frequency band. A high-pass filter (HPF) is connected in parallel with the main track (M) between a halfway point from the coil (L1) to the external electrode (14a) and a halfway point from the coil (L2) to the external electrode (14b), and has a property that attenuation decreases as frequency increases in a given frequency band.</p> |
