7-21 GHz wideband phased array radiator

Raytheon has developed a novel wideband, dual-polarized, element with excellent cross-polarization isolation to populate the AMRFC high band transmit array. The electrically short crossed notch (ESCN) element consists of an orthogonal pair of tapered crossed-notch radiators with a balanced feed to increase polarization purity. The ECSN provides excellent polarization performance versus scan (better than current notch capabilities). The 2X (3-9 GHz) measured co-polarisation and x-polarisation performance of the embedded element in the E-, H-, and diagonal planes and the swept gain performance were discussed at the 2003 Phased Array Conference. This paper discusses the measured performance of the 1X (7-21 GHz) version with the fully integrated balun. The measured embedded element performance for the E-, H-, and diagonal planes is discussed as well as the novel balun design which enables the outstanding performance.