We explore invisibility cloaking using ultra-thin printed metasurfaces that can make large objects effectively “invisible” to microwave signals. Instead of bulky metamaterial shells, our approach guides incoming waves along the surface of an object and reconstructs them on the other side, dramatically reducing scattering. By engineering spatially modulated surface patterns, we realize compact, passive, and even dual-polarized or spherical cloaks using practical printed-circuit technologies.

We design ultra-thin printed metasurface antennas that transform guided surface waves into highly directive radiation with tailored beam patterns. By engineering spatially modulated surface impedances, our antennas can generate broadside, multi-beam, sector, and even circularly polarized radiation in compact, planar or conformal platforms. Unlike conventional periodic leaky-wave antennas, our approach synthesizes the full aperture field while rigorously accounting for practical material losses, enabling accurate and efficient beam control using standard printed-circuit technologies.

We develop wideband, wide-angle microwave absorbers using multilayer metasurfaces composed of analytically modeled grid impedances. By combining homogenized surface impedance models with transmission-line analysis, the complete reflection response can be rapidly predicted for both polarizations and arbitrary incidence angles—without relying on time-consuming full-wave optimization.

We design multilayer periodic dipole arrays that precisely redirect incoming electromagnetic waves into engineered reflection and refraction angles. By optimizing passive reactive loads on stacked antenna layers, incident plane waves can be steered entirely into a single anomalous direction or split into multiple controlled beams with near-unity efficiency.