Finite array trunication effects on polarization

An important system design specification for electronically scanned arrays (ESAs) is the polarization purity for certain scan volume. Methods for determining the polarization levels of an array will be discussed and used to quantify finite array truncation effects on polarization purity of ultra-wideband (UWB) arrays. Simulated finite array results are used to examine the polarization properties of a Vivaldi array and a Planar Ultra-wideband Modular Antenna (PUMA) array, and are compared with their respective infinite array results.