| 摘要 |
PROBLEM TO BE SOLVED: To achieve calibration of outputs of digital/analog converters of a DBF(digital beam forming) antenna between channels with simple circuitry. SOLUTION: The DBF antenna, where Fourier transform devices 11 to 1n and the digital/analog converters 21 to 2n provided so as to correspond to element antennas 41 to 4n respectively generate transmission signals to the element antennas 41 to 4n, is provided with mixers 621 to 62n to which output signals from the digital/analog converters 21 to 2n are given, a delay control section 7 that outputs a delay correction signal on the basis of output signals from the mixers, and delay circuits 81 to 8n that apply delay control to a clock signal received by the digital/analog converters on the basis of the delay correction signal.
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