Design of a 2-bit Coding Metasurface with Flexible Phase Control

A 2-bit coding reprogrammable metasurface in X-band is presented to realize flexible phase control. Two PIN diodes are integrated in each coding element, to realize four different on-off states, corresponding to four distinct phase responses. A metasurface composed of 15*15 elements is simulated, fabricated and measured, showing good consistence between simulations and experiments. To demonstrate the phase manipulation performance of the proposed reprogrammable metasurface, three typical coding patterns are designed and simulated, to obtain single-, dual- and multi-beam scattering fields. The results of full-wave simulations indicates good tailoring capability on electromagnetic (EM) wave, suggesting various potential applications on microwave detection and imaging.