Multi-octave BAVA radiating elements for use in modular phased array antennas

Phased arrays for use in future multifunction systems require wideband elements capable of wide angle scanning. Vivaldi elements are widely used but their performance is sensitive to current continuity with neighbouring elements. This complicates manufacture and element replacement in operational use, especially for dual-polar versions. Here we describe the design of a dual-mirrored, dual-polar BAVA element (DmDpBAVA) for use in large phased array antenna apertures over the 6-18 GHz frequency range. FDTD simulation, validated against a Finite Element code, is used to predict the array performance over a 3:1 frequency range for beam scanning out to plusmn50deg. BAVA elements do not require connection with adjacent elements and are therefore attractive for use in phased arrays with modular construction.