Two factors affecting the bandwidth of a reflectarray, the element phase error and the non-constant path delay phase error, have been investigated. A new solution is proposed to reduce the effect of the second factor. Using this method, without adding any particular complexity to the structure, the gain bandwidth of an array rises from 17 to 24%. This array is designed at the center frequency of 1.2 THz which can be used as a lens in the terahertz range. Since the dimensions of an array for such an application would be very large compared to the wavelength, the near-field to far-field transformation is used to accelerate the simulation time.
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