| 摘要 |
PURPOSE:To make it comparatively easy to execute an inspection process where the real action state of an equipment is simulated without really radiating radio waves into the air by incorporating a directional coupler in an electrric wave black box for a transmission antenna and a reception antenna and directly connecting between branching terminals through respective combination line sides with a feeder. CONSTITUTION:Since the directional coupler 2f is incorporated in the electric wave black box 2b for the transmission antenna, an RF signal radiated from the transmission antenna 1b of an radio wave transmitter-receiver 1 is received in an internal antenna 2d and a part of the signal appears in the branching terminal J2 through the combination line of the directional coupler 2f. The RF signal is transmitted to the branching terminal J2 of the electric wave black box 2a for the reception antenna through the feeder 3. Since the combination line side of the directional coupler 2e is connected to the J2, the RF signal is composed with the RF signal for a test which is entered from the terminal J1 connected to the main line side of the directional coupler 2e and radiated from the antenna 2c. Thus the conditions like the real action state of the device can be simulated without radiating the radio waves into the air. |
