Advanced design of large scale microwave devices for space applications using space mapping optimization

This paper summarizes previously published advanced optimization techniques used at the authors company over the past 20 years for the design of microwave devices used in satellite systems. Output multiplexers and switches are essential components of satellite systems. They are considered large scale microwave devices since they have a large number of parameters and they are very time consuming to simulate by electromagnetic simulators. Finite element EM based simulators and space-mapping optimization are combined to produce an accurate design for T-switches and manifold-coupled output multiplexers with dielectric resonator (DR) loaded filters. Space mapping optimization has been used to design large-scale output multiplexers and it has significantly reduced the overall tuning time compared to traditional techniques. A multiple space-mapping optimization algorithm has been developed for T-switch design. The T-switch has six paths and because of symmetry can be designed by considering only two paths. A multiple space-mapping algorithm iteratively enhances the coarse model of each path. The enhanced coarse models are then optimized to meet the required specifications. Excellent RF performance in the C-band and Ku-band has been obtained in few iterations.