Numerical analysis of offset-line-source-fed microstrip reflectarrays

A high-gain offset-fed microstrip reflectarray fed by single and double line sources (where the line sources are ground-plane-backed colinear dipole arrays) is analyzed numerically. This offset-fed configuration with its patch array implemented using rectangular patches only, and again using a combination of different patch geometries, is rigorously investigated. Some parameters of the reflectarray, such as phase errors, radiation patterns, directivities, spillover efficiencies and bandwidth, are analyzed, and its bandwidth is compared to that of a centre-fed configuration.