S.B. Makarov1, A.S. Nersisyan2, S.V. Volvenko3, H.G. Stepanyan4, A.K. Aharonyan5, V.H. Avetisyan6

1,3 Peter the Great St. Petersburg Polytechnic University (St. Petersburg, Russia)

2,4-6 Russian-Armenian University (Yerevan, Armenia)

1 makarov@cee.spbstu.ru; 2 anomonika@mail.ru; 3 svolvenko@spbstu.ru; 4 hrach8086@gmail.com; 5 aharon.aharonyan@rau.am; 6 avahan@mail.ru

In today's world, it is impossible to imagine human activity without mobile communications. This primarily includes cellular mobile networks and communication networks for various services, such as emergency medical services, police, fire safety, etc. Despite all the differences in the functional purposes of these communication networks, they all have one thing in common. This is the provision of communication with subscribers located in different directions relative to the base station that provides communication for a specific network. Therefore, it is important to implement equally accessible, reliable communication provided by an omnidirectional base station antenna. Given the huge number of networks of this kind, the question arises of using a reliable and simple omnidirectional antenna. From this point of view, it is very attractive to design such a transceiver antenna with a vertically mounted circular hollow metal waveguide with transverse slot structures, and to use the axisymmetric nature of the mode in the waveguide for omnidirectionality. The exciter of the mode is built on a rectangular waveguide with mode and waveguide has a pair of symmetrically spaced longitudinal slots from the middle of the wide wall of the waveguide. It is known that if the propagation conditions for mode in the circular waveguide are met, the conditions for the propagation of its main mode are already ensured. In this case, the mode is parasitic and is excited both by the exciter of working mode and by the slots themselves, which are waveguide irregularities. The interaction between the fields of the inevitably excited parasitic mode and the operating mode leads to unevenness in the antenna directional pattern (DP) in the azimuthal plane. The study of the interaction of these modes at the formation of azimuthal DP of antennas with various transverse radiating slot structures on in-phase high-altitude tiers of the waveguide, both as a function of the number of identical slots on the tiers and the number of tiers and their angular offsets in the azimuth plane, clarifies the issue of designing such an omnidirectional antenna. The goal of this work is an investigation of the feasibility of implementing slot antennas using a circular waveguide  mode with a synthesized DP with reduced unevenness. The possibility of synthesizing a DP in the azimuthal plane of the antenna with a maximum radiation unevenness of 2.0 dB is shown, and recommendations for its further reduction are given. The designing of a reliable and inexpensive omnidirectional slot antenna for mobile communication base stations is presented.

Makarov S.B., Nersisyan A.S., Volvenko S.V., Stepanyan H.G., Aharonyan A.K., Avetisyan V.H. Investigation of radiating slot structures of circular waveguides using the magnetic-transversal axisymmetric E01-mode. Radiotekhnika. 2026. V. 90. № 3. P. 31−40. DOI: https://doi.org/10.18127/j00338486-202603-03 (In Russian)

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