N. V. Samburov1, V. A. Obukhovets2
1 TYPHOON JSC (Kaluga, Russia)
2 Southern Federal University (Rostov-on-Don, Russia)

1 samburov.n.v@yandex.ru, 2 vaobuhovec@sfedu.ru

The classical half-wave dipole has a rather small operating frequency band. This paper presents a comprehensive method for expanding the frequency band of a dipole radiator as part of a phased array antenna. The broadband matching effect is provided based on the principle of private compensation of complex load. As the basis of the matching device, a matching method using a reactive loop is used, which has a good matching quality with a complex load with minimal geometric dimensions. A feature of the method is the consideration of the issue of matching a single design “matching device – radiator-reflector”. For this, it is necessary to take into account the influence of both the structural elements of the transmission line matching and the mutual reaction of the reflector and the symmetrical dipole.

The purpose of this work is to synthesize a design of a symmetric dipole radiator for use in a phased array antenna. The paper presents a design containing a dipole excited from a two-wire line (which is also its struts), shorted at the end. This two-wire line is connected in the middle part to the coaxial supply line. The reflector has a complex shape in order to provide the necessary distance from the dipole to the reflector. Based on this model, numerical studies of the design alignment level in a range of variable parameters have been carried out. Using a mathematical model, the possibility of broadband matching has been demonstrated, and the parameters of the primary model for electrodynamic modeling have been found. Based on the formed primary model, a computational experiment has been conducted using 3D electromagnetic simulation software in order to determine the optimal geometry and dimensions of the radiator structure.

Based on the conducted research, the use of additional matching elements on the reflector has been justified for matching the dipole radiator as part of the array. It has been shown that the use of matching elements in the form of conductive partitions in the E- and H-planes stabilizes the effective frequency band during scanning in both planes: both in terms of the central frequency and in terms of the frequency band width.

Thus, a radiator design has been synthesized for use in a phased array antenna, characterized by its actual dimensions and the presence of matching elements on the reflector. The radiator's frequency band corresponds to a 1:1.51 ratio. The level of matching at the input of the emitter during scanning in the E- and H-planes (up to 30 and 45 degrees, respectively) is at least -8 dB (in most cases,
-10 dB).

Samburov N.V., Obukhovets V.A. Design synthesis of a dipole emitter for a wide-band phased array antenna. Antennas. 2026. № 2. P. 17–27. DOI: https://doi.org/10.18127/j03209601-202602-02 (in Russian)

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