Análise eletromagnética do desempenho de antenas instaladas em nanossatélites

Abstract

In this work, the analysis of the electromagnetic behavior of antenna arrays that compose the telecommunications system of CONASAT nano-satellites is discussed. Four independent systems that should operate simultaneously are evaluated. The nano-satellite is intended to be used for receiving data from hundreds of environmental data collection platforms deployed in all regions of Brazil and in the Atlantic Ocean. A transponder will handle this data that will be finally retransmitted back to ground stations. The antennas investigated in this contribution are related to telemetry, telecommand and uplink channel. The evaluation of the telemetry system took into account two scenarios: simple nano-satellite structure, and with articulated aps. Performance assessment under different number of antennas was also carried out. The telecommand system has been analyzed for similar scenarios as for the telemetry system; additionally, both systems have been reallocated to the top part of nano-satellite. The antenna arrays were modeled with the electromagnetic simulator HFSS. The uplink antennas have been designed, built and measured. In this work, a section is dedicated to describe the simulation process, construction and validation, as well as to give a description of the difficulties encountered during the project.