Cylindrical phased array with adaptive nulling using eigen‐correlation technique

Abstract

In this research work, eigen‐correlation matrix based technique is developed for cylindrical antenna array to generate main beam and nulls simultaneously. The array complex weights (amplitude and phase) computed using the developed technique are used for single‐beamforming, multi‐beamforming, and beamforming with nulls steering simultaneously. The limitations of null steering range are investigated for different surface deformations of the cylindrical antenna array. The effects of surface deformations for different cylindrical radii on peak gain of main beam, half‐power beamwidth, first‐null beamwidth, and sidelobe level is also investigated. It is concluded that the developed eigen‐correlation matrix based technique for cylindrical antenna array can be used for desired main beam generation and nulls steering simultaneously. The MATLAB, CST, and measurement validation of eight elements microstrip cylindrical phased array for single/multi‐beams steering and adaptive nulling capability is demonstrated. This in turn makes the cylindrical phased array with adaptive nulling, a potential candidate suitable for use on fuselage portion of aircraft, airport surveillance radars, and mobile communication applications.

Beamforming with 1 × N Conformal Arrays

“…The aforementioned literature Sensors 2022, 22, 6616 2 of 18 study shows that the main focus is on the broadside radiation pattern correction of a conformal antenna array attached to a changing surface (i.e., vibrating surface) using composite amplitude and phase errors measurements, mechanical calibration methods, hardware sensor monitoring and the null points adjusting method. Then again, the previous work (with the exceptions of [27][28][29][30]) was developed under the assumption that the main lobe direction of the radiation pattern was fixed and the location of the nulls for beamforming was not defined.…”

“…The aforementioned literat study shows that the main focus is on the broadside radiation pattern correction of a c formal antenna array attached to a changing surface (i.e., vibrating surface) using com site amplitude and phase errors measurements, mechanical calibration methods, ha ware sensor monitoring and the null points adjusting method. Then again, the previ work (with the exceptions of [27][28][29][30]) was developed under the assumption that the m lobe direction of the radiation pattern was fixed and the location of the nulls for be forming was not defined. Thus, the objective of this work is to study the theory of beamforming for confor antenna arrays attached to the changing wedge-and cylindrical-shaped surfaces in Fig 1a,b for a specific main lobe direction and null locations for the first time.…”