A low cross-polarization decade-bandwidth Vivaldi array

A single-polarized, decade-bandwidth Vivaldi array with low cross-polarization is proposed. The array, termed the Sliced Notch Antenna (SNA) Array, exhibits the wideband impedance performance of Vivaldi arrays, yet it readily over-comes polarization purity degradation while scanned in the non-principal planes. The critical enabling technical innovation is the control of vertical surface current radiation through innovative discontinuities along the flared fins that are designed for decade-bandwidth impedance performance. The concept and performance are demonstrated through infinite array HFSS simulations and finite array Domain Decomposition Finite Element Method (DD-FEM) numerical results of a 19×19 SNA/Vivaldi array PCB-based prototypes.