Figure 2
From: Realizing Tunable Inverse and Normal Doppler Shifts in Reconfigurable RF Metamaterials
The voltage-dependent transmission characteristics.
a, Theoretical dispersion curves under different bias voltages. The gray plane indicates the working frequency 1 GHz, while the red, green and dark curves correspond to three typical bias voltages (6 V, 11 V and 24 V). b, Simulated |S21| under different bias voltages. The branch above is the right-handed passband while the branch blow is the left-handed passband. The dark diamond markers are a set of bias voltages (5 V, 11 V and 23 V) at 1 GHz for achieving the equivalent transmission characteristics in a. c, Measured |S21| verse frequency at the three bias voltages shown in a.
