Complex Reflectance Coverage Retrieval of Coupled Resonator Metasurface Unit Cell Using Printed Capacitor Integration

A novel tunable metasurface unit cell (UC) is described with variable reflective phase and magnitude through the DC-biasing of resistive and capacitive active components. Cuts made to the resonator geometry to facilitate RF-DC isolation between the device terminals has been shown to have detrimental effects on the UC's reflective performance, significantly reducing its complex reflectance coverages. This paper demonstrates a very simple approach to rectify this issue, through the application of a printed capacitor to create an RF short across various isolation gaps within the unit cell. The results of a preliminary full-wave simulation in FEM-HFSS are presented to demonstrate and confirm the concept.