| 摘要 |
PURPOSE:To obtain the accurate measured value of antenna capacity by removing the change portion of a transmission line, by providing change-over function to a transmission line part revolving along with a receiving side antenna and calculating the change in the characteristics of a movable line. CONSTITUTION:When a switch SW 10 is in the side of a contact (a) and connected to an antenna 3 to be tested, a received ratio wave value is supplied to a recorder 13 through a receiver 6, Next, when the switch SW10 is changed over to the side of a contact (b) and connected to a shortcircuit board 11, the reference signal extracted from the side of a transmitter 1 by a coupler 8a is supplied to the receiver 6 and inputted to a circulator CCL 12 through the coupler 8b and further reflected by the board 11 through a movable line 5 and the switch SW 10 while the reflected wave is supplied to the receiver 6 through SW 10, CCL 12 and the amplitude and phase thereof are measured. The change portions of the amplitude and phase of the radio wave in the line 5 accompanied by the rotation of the antenna 3 are calculated. By this method, the radiation pattern of the antenna 3 can be accurately measured.
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