Polarization properties of finite ultra-wideband arrays

An important consideration when establishing the radiation characteristics of phased arrays is the polarization purity for scan situations, defined as the ratio between the co-/ex-polarization levels at the particular scan. Two accepted methods for determining the polarization levels of an array will be used to quantify finite array truncation effects on polarization purity of ultra-wideband 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 respective infinite array results.