Design of a Single Radiator Monopulse Antenna for UWB Direction Finding

This paper proposes the single radiator multi-port antenna with a slot-coupled feeding structure that can estimate the direction of arrival without using multiple array elements. The proposed single patch radiator with a director, which can obtain a high gain characteristic, replaces the multiple array elements. The slot-coupled feeding structure is designed to achieve broadband characteristic in the frequency range of 7 GHz to 9.8 GHz. Then, to observe the direction finding performance, the monopulse ratio which does not require time synchronization is obtained with a root-mean-square error of 0.02.