Reflector antennas are applicable widely in m y fields such as radio asVonomy, remote sensing, and modem satellite communications systems etc, because they have the ability to produce the high gain, low noise radiations and high reliability and provide the enhanced data Vansmission charactetistic. Antenna smctural design is a critical key issue, in which the distortion of reflector surface can seriously affect the electromagnetic performances due to the undesimble phase enor of apeme field. The coupled structural-electromagnetic performances of reflector antennas vary according to the loads on its smcture, such as self-weight at different elevation angles, wind loading, random dynamic loads and temperature distributions. The higher requirement for the extremely precise, larger sire and higher reliability of large reflector antenna smctures have made it necessary to build an optimization platform.
The synthetic optimization of structural and electromgnetic performances of reflector antenna is a coupled problem. Mathemtically, the coupled smctural-elecVomgnetic analyses are mutually nonlinearly dependent multiphysical field problem. Therefore, it belongs to a weak coupling problem which describes a problem where the effects can be separated. The considered field problem are solved in successive steps with individual analysis and the coupling is performed by up-dating and transferring the structural displacement field parameters. The optimization procedure is based on the improvement of both the structural performances and electrical performances. The effects of the analyhcal surface distortion on the electromagnetic performances have been modeled and repeatedly simulated in the optimum-seeking procedure. In this procedure, the electrical performances can be treated as obiect functions or consVaint vaiables. This platform is unlike the previous works, which aims to improve not only the surface precision, but also the electrical performances. Now the coupled optimization platform has the ability to operate as a simulation tool for coupled analysis of antenna.
The coupled optimization analysis of an 16-m antenna system with truss backup structure, as an example, is presented to demonsmte the capabilities of the optimization methodology and platform system. The optimization results show that the smctural mass of antenna can be sigmfilficantly reduced and elecVomagnetic performances enhanced using this coupled optimization platform. Therefore, the period and cost of antenna smctural design can be shorten and decreased.