Wideband Vivaldi Antenna Design with Reduced Radar Cross Section

In this paper, a stealth vivaldi antenna is proposed which covers 7 GHz to 11 GHz operating frequency range with reduced radar cross section (RCS) and high gain. RCS reduction is achieved by the object shaping method fulfilled with the use of introduced circular slots etched in the radiator. These circular slots along the inner exponential profile of the antenna reduce the scattering along the surface of the radiator, which hence causes reduction in monostatic RCS. Compared with the reference antenna, the RCS of the proposed antenna maximally obtains 16 dB reduction. Simulated results related to S11, gain, RCS and VSWR of the reference and proposed antennas are presented. The performance of the proposed antenna is validated.