Numerical study of the scattering characteristics of a cylindrical active dumping system based on a controlled Van-Atta array
In this paper, cylindrical active cancellation system (ACS) based on controllable waveguide Van Atta reflector with circulators, power amplifiers and phase shifters is proposed. Scattering characteristics of a horizontally polarized plane electromagnetic wave on a conducting cylinder with ACS are investigated numerically using Ansys HFSS. The simplified numerical model without controlling device allowed to find RCS minimization condition through the search of signal power and phase in ACS antennas ports. Shown that power in ports, which is required to minimize RCS, is proportional to the RCS value of the ACS with matched antennas. Shown that independent phase shifters controlling can maintain Van Atta array self-focusing at not normal angles of incidence. Obtained at 10 GHz results show that it is possible to minimize cylinder RCS more than -50 dB in desired direction. Worst case -10 dB dumping in 3° angle sector and 300 MHz band achieved. In addition, the radiation patterns and scattering diagrams of the ADS for different minimization angles are shown.