Fig. 1. Structural diagrams of three-channel demultiplexer with metamaterials. (a) Size of top surface; (b) size of bottom structure;

Fig. 2. Simulation results of S-parameter curves of demultiplexer. (a) σ=200 S/m; (b) σ=2×10⁵ S/m

Fig. 3. Equivalent parameters of metamaterial demultiplexer. (a) Equivalent permeability when σ=200 S/m; (b) equivalent dielectric constant when σ=200 S/m; (c) equivalent impedance when σ=200 S/m; (d) equivalent permeability when σ=2×10⁵ S/m; (e) equivalent dielectric constant when σ=2×10⁵ S/m; (f) equivalent impedance when σ=2×10⁵ S/m

Fig. 4. Group delay in operating frequency band of demultiplexer. (a) Simulation results of Port1 group delay; (b) simulation results of Port2 group delay

Fig. 5. Magnetic field intensity distributions and surface current distributions of demultiplexer. (a) Magnetic field intensity distribution at 0.298 THz; (b) magnetic field intensity distribution at 0.500 THz; (c) surface current distributions at 0.298 THz; (d) surface current distributions at 0.500 THz

Fig. 6. Influence of metal wire width on S₁₁ and S₂₁ of demultiplexer. (a) σ=200 S/m; (b) σ=2×10⁵ S/m

Fig. 7. Influence of outer ring length on S₁₁ and S₂₁ of demultiplexer. (a) σ=200 S/m; (b) σ=2×10⁵ S/m