| 摘要 |
PROBLEM TO BE SOLVED: To realize a wireless information household electrical appliance, the mounting position of an antenna which has no restriction, whose installation is less restricted and that causes only a small limit in its communication area and has less reduction in a communication distance, even when the wireless information household electrical appliances such as set-top boxes are stacked. SOLUTION: A metal case 101 is used for a resonance antenna and power is supplied through a mount screw 104, or a ground wire 109 connected in terms of DC, or an exciting patch 113 which is coupled electromagnetically. Furthermore, diversity is conducted in exciting modes. Moreover, the antenna is matched automatically by using a varactor diode and a ferroelectric capacitor. |
