N.I. Bobkov¹

¹JSC "All-Russian Scientific Research Institute "Gradient" (Rostov-on-Don, Russia)

¹ua6lac@mail.ru

It is known that for active frequency-independent antenna arrays designed based on the principle of electrodynamic similarity, the energy efficiency decreases with increasing operating frequency due to a reduction in the effective aperture size. Furthermore, implementing excitation circuits for radiators over a wide frequency band is a rather complex task. These features motivate the search for alternative ways to construct antenna arrays with frequency-independent directivity characteristics. For antenna arrays designed in accordance with the compensation principle, the formation of frequency-independent directivity characteristics is achieved by dephasing the aperture with a fairly simple phase change law and a constant amplitude distribution with frequency. Therefore, the development of a method for synthesizing a frequency-dependent phase distribution in the array aperture, ensuring the formation of frequency-independent directivity characteristics, is relevant.

This article proposes a method for synthesizing a frequency-dependent phase distribution that ensures the formation of frequency-independent directivity characteristics for antenna arrays over a wide frequency band. The method is based on representing a given volumetric radiation pattern using an auxiliary aperture of a simple shape (rectangle, circle) with separable amplitude-phase distributions in orthogonal cross-sections. Using the example of synthesizing an antenna array with a rectangular aperture, it is shown that, due to increasing dephasing of the radiators with increasing frequency, the compensation effect for changes in the radiation pattern width is maintained over an eight-fold frequency band, while the standard deviation of the generated radiation characteristics from the specified ones does not exceed 2%. The decreasing amplitude distribution remains constant with frequency. Using the proposed synthesis method reduces the cost of developing and implementing circuits for generating amplitude-phase distributions in the aperture of frequency-independent antenna arrays.

Bobkov N.I. Method of phase distribution synthesis for forming frequency-independent characteristics of phased antenna arrays. Radioengineering. 2025. V. 89. № 11. P. 143−149. DOI: https://doi.org/10.18127/j00338486-202511-17 (in Russian)

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