A Physically Reconfigurable Origami Reflectarray Based on the Augmented Square Twist Pattern

This paper proposes a novel mechanically frequency reconfigurable high-gain Reflectarray Antenna (RA) design, which is based on the Augmented Square Twist (AST) origami folding pattern. The RA was designed to operate at two operating frequencies, 20 GHz (lower band) and 40 GHz (upper band) in its unfolded and folded states, respectively. The main beam is directed along φ = 90°, θ = 30° at the lower band and φ = 90°, θ = 20° at the upper band. The RA was excited by a 15 dBi linearly polarized standard gain horn antenna positioned at a focal distance of 9.6λ with a 20° offset angle. The proposed origami RA achieved a gain of 27.0 dBi and 28.6 dBi at its unfolded and folded states, respectively.