Time-domain Simulation Of Electrically Large Electromagnetic Structure Practice

With the rapid development of modern science and technology, large and complex problems which were only designed qualitatively before can now be solved quantitatively. Thanks to the high speed and cheap memory of computer, problem size which can be simulated becomes larger and larger. But still it can't catch up with ever-increasing demands. To address this issue, choosing suitable algorithms is critical. Among various simulation methods, time domain solver is the best choice for simulation of electrically large objects. We have selected CST Microwave Studio? for our practical designs. FIT (Finite Integration Technique) and its validation for the simulation of electrically large objects are presented in the thesis. Two practical design cases are presented in details, one being a GTEM chamber and another antenna placement on a satellite. Two simulation skills are applied to the GTEM chamber: frequency and spatial extrapolation methods for this electrically-large object. A complete procedure of unit antenna simulation and design, and placement optimization of antennas is presented for a contracted design of an on-going satellite project. Some useful skills, such as application of magnetic wall for antenna simulation, PBA, convergence study, maximization of minimum mesh step, real model approach, reduce model analysis in using this code, are depicted. Several designs are given together their measurement data, which show a good agreement with each other. It clearly demonstrates that the time-domain solver is an effective and versatile tool for studying such problems.