A single-layer broadband dual-band linearly polarized reflectarray

A single-layer broadband dual-band orthogonal linearly polarized (LP) reflectarray antenna composed of two types multi-resonant broadband elements is designed and analyzed. The element of lower band is comprised of split rectangular ring and dogbone-shaped structure, and the element of upper band is comprised of two bend lines and one straight line. A single-layer dual-band (12.5GHz and 14.5GHz) LP reflectarray is designed and simulated based on the two types elements. Simulated results demonstrate that 1dB gain bandwidth of 18% for the upper and 12% for the lower bands are obtained, respectively. Further, an effective method to illustrate the feasibility of the design comparing the radiation patterns of the dual-band reflectarray with single band (upper band or lower band) reflectarray individually is introduced. Simulated results demonstrate that the proposed dual-band reflectarray remain the radiation characteristics of single band reflectarray designed separately.