General analysis tool for reflectarray antennas in dualreflector configurations

This paper presents a general modular technique to analyse different types of dual-reflector configurations, where the main, the sub, or both reflectors can be a flat or a curved reflectarray. The technique has been applied to two particular cases: a parabolic reflectarray with a flat sub-reflectarray, which was previously designed to produce a South American coverage; and a dual-reflectarray designed to produce a focused beam at 94 GHz deflected by 5 degrees respect to the antenna boresight. The results show a satisfactory agreement with previous reported data and validate the analysis technique in two particular cases.