E.V. Ovchinnikova¹, S.G. Kondratieva², P.A. Shmachilin³,  Nguen Dinh To4, E.V. Gadzhiev5, A.O. Perfilova6

1−5 Moscow Aviation Institute (National Research University) (Moscow, Russia)

2,3 Peoples Friendship University of Russia (Moscow, Russia)

5 JC “VNIIEM Corporation” (Moscow, Russia)

6 LLC “Inspider” (Moscow, Russia)

Horn and waveguide antennas provide high reliability and low losses; therefore, they are widely used in on-board satellite communication systems (SСS). One of the most important characteristics of such antennas is the maintenance of a high ellipticity coefficient over a wide angle sector. Waveguide polarizers have good polarization characteristics. Polarizers based on square waveguides are easier to manufacture and calculate, because the inhomogeneities, due to which a 90° phase shift occurs between the orthogonal field components, are located in the orthogonal planes of the Cartesian coordinate system. At present, various combinations of thin diaphragms located on two opposite walls of the waveguide or sections of corrugated waveguides are widely used to construct polarizers on a square waveguide. A waveguide stepped polarizer, which is simpler in design, is a square waveguide divided into two standard rectangular waveguides by a conducting partition. The simplest form of a septum-polarizer with a linear baffle. The article developed models of waveguide emitters based on septum-polarizers with a linear partition. The parametric optimization of the emitters was carried out in order to achieve the ellipticity coefficient of at least 0.7 in the sector of angles ± 70°. The directivity characteristics of an antenna array of 8 elements are determined. A significant influence of the interaction of radiators in the antenna array on the dependence of the ellipticity coefficient on angular coordinates is shown.

Ovchinnikova E.V., Kondratieva S.G., Shmachilin P.A., Nguen Dinh To, Gadzhiev E.V., Perfilova A.O. Modeling an antenna array  from waveguide radiators based on septum polarizers. Radiotekhnika. 2021. V. 85. № 4. P. 108−118.  DOI: https://doi.org/10.18127/j00338486-202104-12 (In Russian)

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