V. V. Zadorozhnyj1
1 FSUE “Rostov-on-Don Research Institute of Radio Communication” (Rostov-on-Don, Russia)

Actual issues in the design of active phased antenna arrays (APAA) are the problems of optimizing their characteristics. At the same time, one of the most important tasks is to reduce the high cost of APAA, due to the placement of active elements (power amplifiers and low-noise amplifiers) in each channel. One of the possible options for reducing the cost of APAA is to reduce the number of active channels by using a sparse antenna array as a radiating system.

The goal of the article is to reduce the number of active AFAA channels by using a sparse radiating system at a given fill factor and minimum loss. The achievement of this goal includes solving the following tasks: development of a method for synthesis of a sparse APAA radiating system with a given fill factor according to the criterion of minimization of the side lobes level on the basis of a genetic algorithm; evaluation of APAA characteristics with a sparse radiating system.

It has been established that replacement of the APAA emitting system with an equidistant arrangement of elements with a decreasing distribution by a sparse emitting system synthesized using the proposed method reduces the number of APAA channels with dimensions of 20x20 and 40x40 elements by 20% in accordance with the specified fill factor 0.8 and when implementing a narrower 10.4% and 4.8% width of the main lobe of the directional pattern, maintaining the side lobe level and reducing the directivity by 0.22 and 0.52 dB, respectively.

The proposed method for synthesis of a sparse radiating APAA system with a given fill factor based on the genetic search algorithm reduces the number of APAA channels and minimizes the side lobe level in the given sector of angles.

Zadorozhnyj V.V. Method for synthesizing a sparse antenna array with a given fill factor based on a genetic algorithm. Antennas. 2023. № 5. P. 5–12. DOI: https://doi.org/10.18127/j03209601-202305-01 (in Russian)

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