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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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