SYNTHESIS OF THE DESIGN OF BROADBAND MATCHING OF A DIPOLE RADIATOR
Abstract
The classical half-wave dipole has a rather small operating frequency band. The paper presents a comprehensive method for extending the frequency band of a dipole radiator. 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 the work is to synthesize the design of a symmetrical dipole radiator with a matching reactive loop. 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. For this purpose, the design of the dipole radiator has been formatted, the number, nomenclature and range of variable parameters have been determined, and a mathematical model has been formulated and verified. 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 is demonstrated, and the parameters of the primary model for electrodynamic modeling are found. Based on the formed primary model, a computational experiment was conducted using 3D electromagnetic simulation (HFSS) software in order to determine the optimal geometry and dimensions of the radiator structure. In one case, the maximum value of the operating frequency band was chosen as the criterion of optimality, in the other - the maximum directional coefficient. These cases reflect the practical tasks of using emitters of this type. The possibility of matching in a frequency band of at least 80% has been demonstrated. The results of verification of the mathematical model, mathematical and electrodynamic modeling, as well as the layout of the radiator are presented
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