Conformal reconfigurable holographic metasurface for multifunctional radiation and scattering modulation

A reconfigurable holographic metasurface (HM) with multifunctional modulation of radiation and scattering for conformal applications is designed in this paper. Based on optical holography theory, a holographic conformal modulation mechanism is proposed, and the conformal surface impedance distribution of HM is derived. To illustrate this mechanism, the designed conformal reconfigurable HM is used to demonstrate a series of radiation and scattering modulation functions, with its reconfigurable property enabling dynamic beam control. In radiation mode, beam scanning with wide angle from textminus50textdegree to 50textdegree is achieved. In scattering mode, specific responses are generated under different incident angles, including beam steering under oblique incidence within textpm60textdegree, multi-beam splitting within textpm60textdegree under normal incidence, and diffuse reflection. Low radar cross section (RCS) is exhibited over a wide frequency band from 7.2 to 25 GHz. The designed conformal reconfigurable HM shows high adaptability to cylindrical platforms, insensitivity to oblique incidence, and stability in beam deflection angles, which provides an innovative technical approach for information transmission and stealth in conformal devices.