A broadband microstrip reflectarray with five parallel dipole elements is proposed. Based on the operating mechanisms and the reflection phase characteristics of the five-dipole elements, the elements for the broadband reflectarray are designed. The radiation patterns of the five-dipole element reflectarray with the design frequency of f 0 = 15 GHz are measured, and 1-dB gain bandwidth of 33.52% is achieved. The measured peak gain at f 0 = 15 GHz is 31.4 dBi, which corresponds to the high aperture efficiency of 64.1%. Index Terms-Broadband reflectarray, high gain antenna, multi-dipole element

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Woo-sang Lee and Joon-ho So 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.