A Millimeter-Wave Broadband in situ Alignment and Monitor System Based on Interferometric Direction-Finding Antenna

Based on the modified apertures coupling theory, this paper demonstrates a millimeter-wave broadband interferometric in situ alignment and monitor system. The numerically calculated results for the directional coupler have been validated by a comparison with the simulated ones, and the results show that the directional coupler can be applied in the interferometric systems. By nulling the difference of the power signals as well as the mixing signals from each coupler pair, spatial and angular alignments of a beam oblique incidence on the mirror can be performed, meanwhile, the power and the incident angle can be detected. Finally, the adjustment precision of the interferometric system completely meets the requirements and it is expected to be used in the active denial system and the high-power radar system.