Virtual prototyping of diplexers by using CST Studio

The article deals with automatization of diplexer design in CST environment. A unique library of macros has been developed to support coaxial filter modeling, tuning and optimization in CST Microwave Studio. Comprise general filter topology, cavities, internal couplings and external couplings respective. Next, basic principles of Tuning Space Mapping (TSM) method implemented into CST are mentioned. The function of fine and coarse model and their link between each other is explained. The whole algorithm is illustrated on the particular UMTS diplexer design and optimized results are compared to measured ones.