| 摘要 |
<p>In the present invention, a series resonance circuit of a coil (L1) and a capacitor (C1) resonating in an FM band is connected to a terminal (1) of an impedance transformation transformer (T). As a result, the terminal (1) is in an ungrounded state in the AM band. Therefore, the signal of the AM band passes through the impedance transformation transformer (T), is output from a terminal (3), and, via a capacitor (C3), is output from a port (PT2). Furthermore, the terminal (1) is grounded in the FM band. Therefore, the signal of the FM band is impedance-transformed at the impedance transformation transformer (T) so as to be output from the terminal (3), and, via the capacitor (C3), is output from the port (PT2). As a result, it is possible to reduce pass-through loss in the AM band and the FM band, and to achieve a superior VSWR in the FM band.</p> |
