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About: Reflectarray antenna     Goto   Sponge   NotDistinct   Permalink

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A reflectarray antenna (or just reflectarray) consists of an array of unit cells, illuminated by a feeding antenna (source of electromagnetic waves). The feeding antenna is usually a horn.The unit cells are usually backed by a ground plane, and the incident wave reflects off them towards the direction of the beam.A phase distribution of concentric rings is applied to focus the wavefronts from the feeding antenna into a plane wave (to account for the varying path lengths from the feeding antenna to each unit cell).A progressive phase shift can be applied to the unit cells to steer the beam direction. It is common to offset the feeding antenna to prevent blockage of the beam.In this case, the phase distribution on the reflectarray surface needs to be altered. A reflectarray focuses a beam in