1-bit Multipolarization Reconfigurable Metasurface for Dynamic Focusing

The reconfigurable metasurface improves the flexibility of the metasurface and solves the problem that the characteristics including the focus and focal length cannot be changed after the traditional focusing metasurface design is completed. Combining the metasurface with active phase shifter such as PIN diode to form a reconfigurable metasurface, the resonant status of the element can be changed by switching the diode. However, the flexibility of element polarization is often required in practical applications, which needs to be achieved by increasing the number of diodes. In this paper, we propose a 1-bit multipolarization reconfigurable metasurface element containing two diodes and one DC bias line. The 1-bit phase shift is achieved within 180°±20° at 5.56~6.38 GHz. Then a 20*20 array is formed to verify the dynamic focusing function, and the simulation results demonstrate the effectiveness of the proposed method.