Research of the properties of radio-absorbing materials in the designs of antenna nozzles

The article presents the simulation results in the Ansys HFSS computer-aided design system of the S-band transmitting antenna attachment, which is necessary for testing antenna-feeder devices in conjunction with radio systems of launch vehicles or spacecraft at the technical or launch complex of the cosmodrome, where a mobile service tower. When designing the optimal design of the antenna attachment, in addition to determining the size of the body, the optimal location and geometric characteristics of the communication element and the tuning element, the correct choice of radio-absorbing material is of great importance. The article presents the results of theoretical and experimental studies of the use of domestic radio-absorbing materials of the «XB» brand in the design of the S-band antenna attachment. It is shown that the optimal variant is the use of XB-3.2 radio-absorbing material in the S-band AN design for the onboard antenna of the radio-technical system of the space rocket, in which the maximum power absorption occurs in the range of higher frequencies, while the antenna attachment provides coordinated operation with the onboard antenna, and the power attenuation value does not exceed 5 dB.