Wideband Millimeter-Wave Beam Scanning Dielectric Resonator Antenna

This paper proposes a wideband millimeter-wave beam-scanning rectangular dielectric resonator antenna (DRA) using T-shaped microstrip lines to feed differentially. Two T-shaped microstrip lines are attached to the two opposite long sides of the rectangular DRA, and are respectively fed with equal-amplitude and opposite-phase signals to realize differential feeding. By exciting the modes of two wide beams and combining the resonance points of the two modes, the characteristics of wideband and wide beam scanning are realized. Finally, the characteristics of the frequency band covering 25.2 GHz-41.7 GHz, the relative bandwidth of 49.3%, the scanning angle of ±54° for the low frequency resonance point and the ±42°scan angle for the high frequency resonance point are realized.