Figure 1

(Color online) (a) The structure of the chiral SRR. (b) The chiral SRRs are fabricated on PCBs and cut into strips. The PCBs have a dielectric constant of ${ϵ}_r=3.76$ with loss tangent of 0.0186 and thickness of 1.6 mm. The metal structures are built on copper with a thickness of $36\mu \text{m}$. The SRRs are two-gap split rings with an identical gap width of 0.3 mm. The inner radius of the rings is 1.25 mm and the outer radius is 2.25 mm. The distance between adjacent rings is 8 mm. (c) The strips are then interlocked to form the chiral metamaterial slab. (d) The metal ground plate and the cover plate are attached to the metamaterial slab to obtain a metamaterial absorber. The metal ground plate is also a PCB with copper on one side. The cover plate is a PCB with no copper cover.Reuse & Permissions

Figure 2

(Color online) The simulation results of absorption at different angles $\theta$ for (a) TE polarization and (b) TM polarization. Insets illustrate the two polarizations and the angle $\theta$.Reuse & Permissions

Figure 3

(Color online) The experimental results of absorption at different angles $\theta$ for (a) TE polarization and (b) TM polarization. Insets illustrate the two polarizations and the angle $\theta$.Reuse & Permissions