A.M. Karlov, E.V. Volkhonskaya, E.V. Korotey, K.V. Vlasova

Formulation of the problem. In connection with the continuous expansion of the sphere of services in the field of satellite communications and telecommunications, there is now a continuous increase in the number of relay satellites in geostationary orbit, some of which operate in several frequency ranges. In the terrestrial segment of such communication systems, two-mirror antennas of the Cassegrain and Gregory systems are used. The observed tendencies of an increase in the number of satellites and an expansion of the operating frequency range lead to the need to use feeds in such antennas that simultaneously operate in several frequency ranges, as well as to reduce the width of the directional pattern of the reflector antenna. The second problem is solved by optimizing the geometric parameters of the reflector antenna, and the first can be solved by using a broadband horn or log-periodic feed. 

Goal. The goal of the experiment was to expand the operating frequency range of a two-mirror antenna by using a broadband logperiodic feed of the C-X range, as well as evaluate the radiation parameters of a two-mirror Cassegrain antenna with such a feed.  Results. A mathematical model has been developed that determines the radiation field of a two-band log-periodic feed of a two-mirror Cassegrain antenna. Using the developed model, estimates of the radiation parameters (the width of the directional pattern (DP), the maximum level of side lobes (LBL), the directional action factor (DIR) and the surface utilization factor (CU) of the main mirror) were obtained, which satisfy the requirements for them.

Practical significance. The obtained mathematical model can be used at the design stage of Cassegrain two-mirror antennas operating in two adjacent frequency ranges.

Karlov A.M., Volkhonskaya E.V., Korotei E.V., Vlasova K.V. Modeling of the directional properties of Kassegrain  two-mirror antenna with dual-band logoperiodic irradiator with MathCAD. Radiotekhnika. 2021. V. 85. № 2. P. 5−10.  DOI: 10.18127/j00338486-202102-01 (In Russian).

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