On Predistortion Filtering for Switched Beamforming With Phased-Array Antennas

Published

March 26, 2023

Author(s)

Jack Chuang, Camillo Gentile

Abstract

In recent work, we proposed sweeping the antennas of phased arrays and beamforming in postprocessing – what we coined switched beamforming – instead of sweeping beams through analog beamforming – what the arrays are designed for. Not only is it orders of magnitude quicker to sweep, it also synthesizes beam patterns that are quasi-ideal. In the same work, we proposed predistortion filtering to compensate for the non-idealities of the hardware. Because a separate predistortion filter was designed for each of the swept antennas, leakage between the antennas was not accounted for. In this paper, we propose an improved design for a single filter that accounts for mutual leakage by considering all antennas in the design. Not only does it improve the peak-to-sidelobe suppression by a factor of 25 dB, it also experiences less degradation as the beam is steered from boresight.

Conference Dates

March 26-31, 2023

Conference Location

Florence, IT

Conference Title

IEEE European Conference on Antennas and Propagation

Pub Type

Conferences

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Keywords

5G, 28.5 GHz, calibration, channel sounder, millimeter-wave (mmWave), propagation.

Citation

Chuang, J. and Gentile, C. (2023), On Predistortion Filtering for Switched Beamforming With Phased-Array Antennas, IEEE European Conference on Antennas and Propagation, Florence, IT, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935716 (Accessed October 1, 2025)