Transmissive and Leaky-Wave Beamforming Metasurfaces

This paper describes our efforts to develop transmissive and leaky-wave metasurfaces for the control of electromagnetic wavefronts. The transmissive metasurfaces consist of three spatially-varying capacitive sheets separated by two dielectric spacers. They are designed using an integral equation formulation and optimization that accounts for the inhomogeneity of the impedance sheets. The transmissive metasurface beamshapes and collimates the field radiated by an electric line source. Furthermore, directly-fed leaky-wave metasurfaces consisting of a spatially-varying capacitive sheet on top of a ground plane of varying height are also reported. A leaky-wave metasurface design that produces a uniform aperture pointed at 45 degrees is reported.