| 摘要 |
An impedance converter circuit includes a transformer with a primary coil connected to a power feed port, a phase shifter circuit connected between a secondary coil of the transformer and an antenna port, and a bypass circuit connected between the power feed port and the antenna port. In a high band, an absolute value of impedance of the transformer viewed from the antenna port via the phase shifter circuit is higher than an absolute value of impedance of the bypass circuit. In a low band, the absolute value of the impedance of the transformer viewed from the antenna port via the phase shifter circuit is lower than the absolute value of the impedance of the bypass circuit. |
