A Planar Monopulse-Beam Steering Antenna with Wide Field-of-View for Indoor Localization

This paper presents an antenna design for electronically steering monopulse beams at wide angles. Unlike conventional monopulse antennas, the proposed one employs the inner two antennas to steer a deep null, while other antennas are used to produce a directive beam. The modification offers high efficiency and wide-angle monopulse scanning without ambiguities, which is suitable for indoor localization. The proposed antenna has the reflection coefficients of Σ and Δ ports better than −10 dB in 22% fractional bandwidth. The Σ and Δ patterns have a beam width and sharp angular resolution of 25° and 1° at 4.9 GHz, respectively, offering accurate direction-finding.