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Reflectarray Antenna with High Efficiency and Low Side Lobe

The design of a reflectarray antenna(hereinafter referred to as a reflectarray), is generally based on the resonant element spacing to suppress the grating lobes in free space. However, considering that this condition is not sufficient, we designed a resonant element spacing to suppress the grating lobe in the dielectric. This paper compares the radiation pattern and gain designed with the resonant element spacing obtained under these two conditions, and evaluates the efficiency and side-lobe characteristics.