A Low-RCS Multifunctional Reflectarray Antenna Based on Frequency Selective Rasorber

This paper presents a multifunctional reflectarray antenna (MRA) featuring selective in-band switchable polarization and out-of-band radar cross-section (RCS) reduction. To mitigate the strong out-of-band reflections inherent in conventional reflectarray antennas, a frequency-selective rasorber is designed as the top-layer metasurface, providing a transmission passband for in-band operation and dual broadband absorption bands for out-of-band RCS reduction. The bottom-layer metasurface is a 1-bit