Efficient Waveguide Mode Conversions Based on Phase-Gradient Metasurfaces

Based on phased-gradient metasurfaces, an efficient method is developed to convert waveguide modes in a parallel-plate waveguide. An effective wavevector is imparted to the incident mode at each interaction with matesurfaces, resulting in the mode conversion. The numerical simulation indicates that the efficiency and purity of TE1-to-TE2 conversion can significantly reach up to 99.98% and 99.99% at 9GHz. The conversion between TM3 and TM4 is also achieved, which gives a fair verification of the polarization insensitivity. This work can provide technical guidance for compact modes control.