Monopulse IFF interrogator antenna with optimised parameters, minimising the possibility of generating false replies by transponder

This paper describes the results of field research and measures conducted by CNPEP RADWAR S.A. of solutions used in monopulse antenna for portable interrogator "friend or foe" IFF set with optimised parameters, minimising or practically eliminating false replies from friendly objects remaining on the back radiation hemisphere. This solution has a crucial importance on the battlefield for the survivability and the ability to minimise losses caused by fratricidal fire. The author has conducted field tests of the real equipment configuration taking into consideration the probability of identification as the main evaluation criteria instead of traditional antenna coverage diagram. The results fully confirmed the operational requirements for the designed antenna. The basic idea of design can be applied to any other antenna system, especially for secondary radiolocation devices.