An UWB Hemispherical Vivaldi Array

We report the first conformal ultra-wide band (UWB) array on a doubly curved surface for wide angle electronic scanning. use quadrilateral mesh as basis systematically arraying UWB radiators arbitrary surfaces. A prototype consisting of 52 element, dual-polarized Vivaldi arranged over 181 mm diameter hemisphere is developed. The antennas and SMP connectors are 3D printed out titanium to allow simple fabrication assembly. derive theoretical gain hemispherical based antenna size number elements. measured realized within 2 dB value from 2-18 GHz scan angles 120{\deg} z-axis. This field view twice that planar with same in agreement theory. work provides baseline performance larger arrays have more uniform meshes. Furthermore, basic concept can be extended other radiating