High Phase Consistency for Millimeter Wave L-Shaped Array

A method of loading parasitic short-circuit branches to improve the phase consistency of the L-shaped array is proposed in this paper. The differential fed array has a higher phase consistency compared to the single-fed one. Loading strip-shaped short-circuit branches on the radiating edges of the element can reduce its far-field phase fluctuation in the desired angular domain. Loading T-shaped short-circuit branches can shift the far-field phase difference of the element. The simulation results show that the phase differences of the array elements maintain within ±10° over the range of ±45° in both azimuth and elevation directions at the center frequency of 24 GHz. The high phase consistency and simple structure of the array make it a good choice in the orientation system.