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Design of Single Radiator Direction Finding Antenna Using SIW Feeders

This paper proposes a multimode substrate integrated waveguide (SIW) feeding system with a single patch antenna for monopulse direction finding applications. The multimode feeding system allows to radiate the sum and difference patterns with a single radiator. The maximum gains of each sum and difference pattern are 2.1 dBi and −2.6 dBi, respectively. We then obtain a calibration factor that minimizes the RMSE of the angle of arrivals to 2.1°.