| 摘要 |
PURPOSE:To use a transmission line in common for an amplified signal and electric power voltage by providing a method of passing the amplified signal from an active circuit selectively and another method of passing an operation power voltage for the active circuit selectively. CONSTITUTION:An antenna signal from antenna element 1 is input to antenna box 2. Then, active circuit 3 amplifies the antenna signal. This amplified signal output is transmitted to coaxial cable 6 by way of high-pass filter 4. To the output terminal of this high-pass filter, the input terminal of a low pass filter is connected to lead a DC voltage out and the DC voltage is led to the electric-power-voltage application terminal of active circuit 3. |
