Holographic‐Reflective Metasurface for Independent Control of Surface and Space Waves

ABSTRACT

In this letter, a holographic‐reflective metasurface (HRM) is proposed for independently controlling of surface waves (SWs) and spatially propagating waves (SPWs) at the same operating frequency. The meta‐atom consists of four holographic sub‐cells that determine the surface impedance for SW‐to‐radiation conversion, together with a reflective structure whose length defines the phase of the reflected SPW. Three prototypes, including a multi‐beam HRM and two low radar cross section (RCS) HRMs are designed. The measured results show that the low‐RCS HRMs achieve beam steering and RCS reduction. The multi‐beam HRM is capable of generating a directional beam in the holographic mode and a conical beam in the reflection mode, achieving a peak broadside gain of 17.5 dBi and a radiation null depth of 22 dB.