Dual-band Anomalous Reflection with Interleaved Metagratings

A new metagrating topology is proposed to enable perfect anomalous reflection of electromagnetic plane waves at two independent bands at microwave frequencies. Two reactively loaded segmented single-band gratings are interleaved together to form a composite metagrating. The constituent halves are electromagnetically shielded from each other through incorporation of PEC baffles, allowing them to be designed independently. Furthermore, isolation between the two frequency channels is achieved with dual-resonant grating wires which can be tuned to be inactive at prescribed frequencies. A dual-band metagrating that performs perfect anomalous reflection at 10 GHz and 15.11 GHz is designed and numerically verified.