An OAM Antenna with Low RCS Characteristic Based on Radiation-Scattering-Integration Strategy

An orbital angular momentum (OAM) antenna with low radar cross section (RCS) characteristic was proposed. Based on the strategy of radiation-scattering-integration (RSI), the metasurface unit cells for RCS reduction were directly excited by probes to radiate microwave energy. The aperture of the configured antenna array was divided into four regions to form the chessboard metasurface so that the RCS was reduced owing to the phase cancellation scheme. Besides, the feeding phase of the four regions was set to generate OAM order of l = ±1. As a result, a low-RCS OAM antenna was realized without any additional structures.