| 摘要 |
PURPOSE:To extend a call distance so as to improve communication quality by connecting a circuit which comes to be high impedance at a transmission frequency to the opposite side of the antenna of a transmission reception circuit which executes radio communication with a codeless telephone set. CONSTITUTION:When a base station 1a transmits sound and data to a mobile station 20 by radio, a part of transmission power flows from a transmission reception circuit part 2 to its own inductor 10a through a call circuit 3. Since its own inductor 10a resonates and it comes to high impedance in the transmission frequency, a part of transmission power is prevented and therefore radiation from module codes 7a and 7b are prevented. A part of transmission power similarly flows from the reception circuit 2 into its own self inductance 10b through a power circuit 5. Since the inductance 10b resonates in the transmission frequency and it comes to high impedance, power is prevented and therefore radiation from AC adapters 8a and 8b is prevented, whereby transmission power is concentrated on the base station antenna 6. |
