Time-Space-Coding Radiation-Stealth Metasurface with Amplitude-Phase Co-Modulation

The integrated design of radiation and stealth holds significant importance for radar communication and camouflage. Currently, radar systems primarily rely on radomes for off-band stealth. However, achieving in-band stealth by radomes and absorbing materials is challenging. Even more challenging is the dynamic control of both in-band radiation and stealth. Therefore, a novel space-time-coding metasurface is proposed for radiation and stealth modes regulation. By adjusting the two PIN diodes loaded on the meta-atom, switching between radiation and scattering modes can be achieved. A 1-bit reflection phase can be achieved in the scattering mode. The stealth is achieved by controlling the scattering properties of the metasurface. In the radiation mode, 2-bit phase modulation is achieved by separately controlling the PIN diodes on the meta-atom and the 3 dB coupler. Additionally, by varying the size of the meta-atom in the y-polarization direction, a 1-bit reflection phase also can be achieved. To validate the proposed radiation-stealth metasurface characteristics, a 12 x 12 prototype is fabricated. This prototype demonstrates important functionalities, including dual-mode radiation, amplitude-phase co-modulation space-time-coding stealth, and space-coding stealth. A space-time-coding radiation-stealth metasurface with amplitude-phase co-modulation is proposed. By adjusting the PIN diodes loaded on the meta-atoms, switching between 2-bit radiation and 1-bit scattering modes can be achieved. By varying the size of the meta-atom in the y-polarization, a 1-bit scattering also can be achieved. This metasurface demonstrates important functionalities, including, dual-mode radiation, space-time-coding, and space-coding stealth. image