THEORETICAL FOUNDATIONS FOR THE DEVELOPMENT OF SIW – WAVEGUIDES ON AIIBVI CRYSTALS FOR SAR RADARS

Abstract

The issue of designing and manufacturing small-sized SAR radars for UAVs and radio engineering systems for phantomizing radio images of SAR space radars based on domestic element base is crucial today for the security and defense sectors of Ukraine. The development of this direction is hampered by the lack of a miniature domestic element base for microwave devices in the 1-100 GHz range. SIW technology is a modern and promising direction for creating microwave components formed on a bulk dielectric material. The higher the dielectric constant of such a material, the smaller the dimensions of SIW components. A^IIB^VI crystals have a relatively high dielectric constant in the range of 5-10, and, provided that the concentration of structural defects is low, their tgd is at the level of 0.001-0.001. These parameters make A^IIB^VI crystals promising for creating SIW waveguides. Currently, there are no publications on the study of SIW waveguides based on A^IIB^VI crystals in the world's scientific literature. Therefore, the object of the study is the process of forming the theoretical foundations of the development of SIW waveguides on A^IIB^VI crystals for SAR radars. The subject of the study is the SIW waveguide model in Ansys HFSS, which is based on the model of dielectric parameters of A^IIB^VI crystals in the microwave range. The aim of the work is to form the theoretical foundations of the development of SIW waveguides on A^IIB^VI crystals for SAR radars. The following results were obtained: a model of dielectric parameters of A^IIB^VI crystals in the range of 1 - 100 GHz was synthesized; the values of the real and imaginary components of the complex dielectric permittivity of A^IIB^VI crystals in the frequency range of 1 - 100 GHz were estimated; the parameters of SIW waveguides on A^IIB^VI crystals for frequencies of 1, 50 and 100 GHz were calculated; In the Ansys HFSS simulator, a model of an SIW waveguide on a ZnS crystal for an operating frequency of 1 GHz was created and the frequency dependence of the S-parameters of the waveguide was obtained. Conclusion: The paper first created the theoretical foundations for the development of SIW waveguides on A^IIB^VI crystals for SAR radars. A critical analysis of the results obtained indicates that the development of SIW components based on A^IIB^VI crystals has excellent potential, but requires further comprehensive research, including theoretical, experimental, and technological aspects.