Self-Reconfigurable Dual-Mode Metasurface

This study realized a novel dual-mode metasurface that exhibited a self-reconfigurable characteristic between the high direction antenna (M1) and the radar cross-section (RCS) reduction (M2). The proposed structure consists of a source patch antenna and an active metasurface with each unit cell loaded with a Schottky diode and two lumped resistors. The switching mechanism of the metasurface is realized by considering the different power levels of the patch antenna. In mode M1, the metasurface acts as partially reflecting surface (PRS) to enhance the directivity of the source antenna. In another case (M2), the ground plane of the antenna and metasurface are used to prevent the transmission and reflection of the incident wave, respectively. Therefore, the absorption function is obtained in the mode. The proposed structure has been investigated and studied using fullwave simulation and confirmed with the experimental demonstration. As result, the proposed structure realizes as the high gain antenna with the pack gain of 13.3 dBi at 4.6 GHz in the mode M1, and as radar absorbing structure with absorptivity of 98% at 4.6 GHz in mode M2.