Non-Conventional Cavity Backed Sinuous Antenna for UWB Radar Applications

This paper illustrates the design of a ultra-wideband (UWB) four arms non-conventional sinuous antenna for radar electronic support measures (RESM) systems. The antenna works from 1.5 GHz to 18 GHz with a slant 45 polarization ensuring good matching impedance and stable radiative performances. The installation on platform is simplified by exploiting several miniaturization techniques that allows to obtain a definitive diameter of 6 cm. The radiating element exhibits directive stable patterns, good polarization purity and high realized gain in the whole frequency band. Finally the design provides an effective miniaturization of the sinuous antenna with encouraging simulation results.