Single-layer reflectarray with combination of element types

A single-layer reflectarray with a combination of element types is proposed. Three element types-square patch, square ring and ring-loaded patch (RLP)-are used together to design the reflectarray by compensating for the drawbacks of one type by the others. The gain of the proposed reflectarray is 29.1 dBi, which is 1.9 dB higher than that of the reference reflectarray that was designed with only the RLP.