Shtykо, T.V.Piltyay, S.І.Булашенко, Андрій ВасильовичBulashenko, Andrii VasylovychZabegalov, I.V.2025-02-182025-02-18202190 degre phase shifter based on a square waveguide with diaphragms / T. V.Shtyk at all // // Хімічна технологія: наука, економіка та виробництво : збірник наукових праць VI Міжнародної науково-практичної конференції, м. Шостка, 20-22 жовтня 2021 р. / гол. ред. Р. В. Закусило. Суми : Сумський державний університет, 2021. P. 266-271.https://essuir.sumdu.edu.ua/handle/123456789/98315Modern antenna systems with polarization signal processing are used to improve the information parameters of the signals processed in them [1, 2]. The basic elements of such systems are waveguide filters [3], phase shifters [4] and polarizers [5, 6]. Phase shifters provide the required phase values at the output. Polarizers provide a differential phase shift at the output of 90º [7]. The most common structures of waveguide polarizers are structures with diaphragms [8, 9], pins [10, 11], combined with pins and diaphragms [12, 13], and coaxial structures [14, 15] and ribbed structures [16, 17]. Differential phase shifter is used in the development of phased array antennas, in the formation of the beam in modern antenna systems and for power supply systems of modern antennas [18]. Modern 90º phase shifters [19, 20] have advanced functionality, simple compact geometric shape, resistant to amplitude imbalance, the ability to maintain a stable phase with multibeam propagation. In addition, such devices are sometimes used in 5G systems [21].encne90-degree phase shifterSquare waveguideDiaphragm-based devicesTheses