Millimeter wave beam steering with a MEMS-based high impedance surface

Beam steering with a MEMS-based high impedance surface has been studied in W band. The steering mechanism is based on the principle of a phase gradient array. Reflection phase properties of a single unit cell structure are analyzed. Radiation pattern of a strip consisting of elements with different impedance is analyzed numerically for two beams of normal and oblique incidence. The steering range is achieved from -45° to 45° with respect to the normal direction.