A u g u s t 2 0 1 5 1045-9243/15©2015IEEE detailed overview of various design methodologies and enabling technologies for beam-scanning reflectarray antennas is presented in this article. Numerous advantages of reflectarrays over reflectors and phased arrays are delineated, and representative beam-scanning reflectarray antenna designs are reviewed. For limited field-of-view beam-scanning systems, utilizing the reflector nature of the reflectarray antenna and the feed-tuning technique can provide a simple solution with good performance. On the other hand, for applications where wideangle scan coverage is required, utilizing the array nature of the reflectarray and the aperture phase-tuning approach are the more suitable choices. There are various enabling technologies available for both design methodologies, making them a suitable choice for the new generation of high-speed, high-gain beam-scanning antennas.
Microstrip reflectarraysSince the revolutionary breakthrough of printed antenna technology, microstrip reflectarrays have emerged as a new generation of high-gain antennas, combining many favorable features of both reflectors and printed arrays as well as offering an alternative design with low-profile and low-mass features [1], [2]. The aperture of a reflectarray antenna consists of elements arranged in a certain grid that are designed