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A wideband low‐radar cross section circularly polarized holographic antenna based on hybrid metasurface

A wideband low‐radar cross section (RCS) circularly‐polarized (CP) holographic antenna (HA) based on hybrid metasurface is proposed. The proposed HA is composed of a source antenna, a holographic metasurface (HM) and a hybrid metasurface. The HM is designed to transform a surface wave (SW) into a right‐hand CP wave. A novel hybrid meatasurface is proposed, which is the main contribution in this paper. The hybrid metasurface consists of two kinds of frequency‐selective absorbers (FSAs), both of which exhibit transmission characteristic for in‐band waves so that a good radiation performance is maintained. For the out‐of‐band waves, HM and hybrid metasurface act together as an absorber within 3–11 GHz. On the contrary, they act as two kinds of reflective FSAs (RFSAs) with 180° ± 37° reflection phase difference within 17–24 GHz. Thus, the RCS is effectively reduced within 3–24 GHz. Finally, a reasonable agreement is obtained between measured and simulated results.