Active impedance metasurface with full 360° reflection phase tuning

• DOI: 10.1038/srep03059
• Publication Date: 2013-10-28T10:09:05Z
• Authors: Bo O. Zhu; Junming Zhao; Yijun Feng
• Keywords: Reflection; Beam steering; Phase control; Reflection coefficient

Impedance metasurface is composed of electrical small scatters in two dimensional plane, which the surface impedance can be designed to produce desired reflection phase. Tunable phase achieved by incorporating active element into scatters, but tuning range limited. In this paper, an with full 360° control presented remove deficiency conventional approach. The unit cell a multiple resonance structure poles and one zero, capable providing variation within finite frequency band. Linear also obtained. Theoretical analysis simulation are validated experiment at microwave frequency. proposed approach applied many cases where fine needed, such as beam steering reflectarray antennas.