Spatial Interference Reduction by Subarray Stacking in Large Two-Dimensional Antenna Arrays

This article proposes a systematic approach for stacking uniform linear arrays (ULAs) of different sizes to reduce sidelobes and form nulls the radiated beam pattern. In sidelobe reduction, vertically stacked ULAs are aligned overall level (SLL). nulling, varying length configure null direction simultaneously sidelobes. Both approaches relaxed ensure feasibility implementation. The methods studied by an extensive set simulations together with azimuth elevation beamforming. A reduction method showed potential better than 30 dB SLL more 20 relative depth less 100 antenna elements. Finally, concepts validated pattern measurements 28 GHz 64-element, 16-chain phased-array transceiver using MHz wide 5G waveform.