Antenna phase difference detection circuit, base station radio apparatus, and antenna phase difference detection method

摘要

PROBLEM TO BE SOLVED: To provide an inter-antenna phase difference detection circuit that can be inexpensively made in a base station radio device.SOLUTION: An inter-antenna phase difference detection circuit is connected with a plurality of antennas, inputs a first transmission signal passing through a path of a transmission signal transmitted by an antenna serving as reference among the antennas, and a second transmission signal passing through a path of a transmission signal transmitted by another antenna different from the antenna serving as reference, outputs a phase difference voltage signal corresponding to phase difference between the two signals, and calculates phase difference between the first transmission signal and the second transmission signal on the basis of predetermined relation between a phase difference voltage signal and phase difference, and the output phase difference voltage signal.SELECTED DRAWING: Figure 1