| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna calibration device which reduces the number of times of measurement.SOLUTION: In an antenna device including a plurality of M-bit phase shifters each for adjusting phases of a plurality of transmission signals inputted from a distributor and a plurality of transmission antennas that radiate a plurality of transmission signals, the antenna calibration device receives a combination signal for which a plurality of transmission signals are combined, by a reception antenna and calculates an amplitude value of the combination signal at X (3≤X≤2) points that are obtained by changing a phase adjustment amount of a phase shifter connected to a transmission antenna of a calibration object for a phase amount corresponding to (360/X) degrees every time. Among the X points, between two points with relatively great or small amplitude values, a phase where the amplitude value of the combination signal becomes maximum or minimum is detected, and a differential between the maximum value or the minimum value of the amplitude value of the combination signal and an amplitude value at a point different from the phase with which the amplitude value of the combination signal becomes maximum or minimum at 180 degrees is calculated. Based on the phase with which the amplitude value of the combination signal becomes maximum or minimum and the differential, calibration values of the phase adjustment amount and the amplitude value are calculated.SELECTED DRAWING: Figure 1 |
