Design of a Single-Layer Dual-Band Metal-Only Reflectarray

A single-layer dual-band metal-only reflectarray antenna (MORA) is designed for the first time. It is capable to achieve differently-oriented pencil beams with the same linear polarization at X and Ku bands. The slot-type Phoenix elements are used with multi-parameter sweeping strategy to simultaneously provide sufficient phase shift coverage at the two design frequencies. At the reflectarray system design level, the dual-frequency phase-only synthesis method is adopted to further simultaneously minimize phase errors at two designed frequencies. To validate the proposed design, a center-fed MORA with a circular aperture of 400 mm in diameter is designed and simulated. The simulated gains are 29.1 dBi at 10 GHz with aperture efficiency of 46.3%, and 32.5 dBi at 15 GHz with aperture efficiency of 45.1%, respectively.