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The issues of calculation and design of printed dual-band director-type antennas with dipole exciters powered at their remote terminals are considered in the monograph. In the course of research, new calculation ratios were obtained for determining the input impedances of antennas of this family, which make it possible to relate the sizes of printed fragments and the distance between them with the required input voltage standing wave ratio (VSWR). An analysis of the results of design and experimental studies has shown that the proposed dual-band director-type antennas are characterized by a quality of matching sufficient for practical use in each of two non-adjacent frequency sub-bands with a good shape of both spatial directiional patterns. The work was supported by RFBR grant No. 20-37-90018, 15 publications in peerreviewed journals, including one paper of the 1st quartile and one paper of the 3rd quartile of the Web of Science scientometric system, as well as two patents of the Russian Federation No. 2712798 (2020) and No. 2743624 (2021).

This paper deals with a novel approach for designing dual-band dipole radiators. The brief explanation of the basic antenna characteristics obtained is given in the paper. The approach proposed is based on the exact analytical solution for the overall input impedance of a system which consists of two ends-fed dipoles. Then, based on this solution the comparison of the analytical and the simulated results is derived and shown in the paper. In the printed model of the system proposed we compensate huge capacitance occurring in the input impedance of a stand-alone ends-fed dipole by decreasing the gap between the dipoles and the ground plane. Besides, the mathematical model of the phase shifter for phased antenna arrays designing, which is designed for improving the linearity of the phase shifting performance is presented below. Thirdly, the crossed dipole-like antenna fed by rectangular waveguide is also proposed in the paper.