Reconfigurable and Tunable Metamaterials: A Review of the Theory and Applications
Figure 10
(a)-(b) Active AMC bow-tie surface showing varactor diode tuning between the bias lines and the vias to the ground plane. (c) Tuning the varactor state changes the frequency response of the AMC. (d) Applying a constant gradient to the AMC capacitances allows beamforming by a bow-tie antenna placed above the surface. Used by permission [64].
