Passive Metasurface for Reflectionless and Arbitary Control of Electromagnetic Wave Transmission

Electromagnetic (EM) wave propagation control is an important issue for both science and engineering. A metasurface is an artificial surface composed of electrically small scatterers. Of late, metasurfacing has been an emerging and promising technique for controlling wave propagation. Traditional metasurfaces mainly employ surface reactances and generally reflect waves when manipulating wave transmission or refraction. In this paper, a passive metasurface employing both surface reactance and positive surface resistance is proposed, which can not only manipulate wave transmission magnitude and phase independently and fully but also suppress wave reflection simultaneously. Furthermore, reflectionless refraction can also be achieved with the proposed passive metasurface. The complete design theory is established for the passive metasurface. Theoretical analysis, prototypes, simulation, and experimental validation are demonstrated. The reflectionless feature of a passive metasurface is important for avoiding multiple wave reflections and interference between stages in EM systems. It also enables novel wave transmission cascade manipulation and may have potential applications in highly directive radiation.